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Kake Hydro Renewables 2013
tp "Pp 'fh . Wind Speed Classifications [- 50m Wind Speed ' ["_]Class /Poor <5.6nv/s atte (_]Cass 2/Marginal 5.6-6.4m/s ' [__]Class 3/Fair 6.4-7mv/s . I]Gass 4/Good 7-7.5mis ) [J Cass S/Excellent 7.5-8mis FJ Class 6/Outstanding 8-8.8m/s [J class 7/Super >8.8 ee ---eesMies [Based on NREL-validated AWS Truewind 2010 map °1 'eeSeeee»>5Ly"7aeom, "eemeetotWind Speed Classifications 30m Wind Speed [___]Class Poor <5.1mis IL_]Class Marginal 5.1-5.9m/s (_]]Class Fair 5.9-6.5m/s [LJ Cass 4/Good 6.5-7mis [J Cass SExcellent 7-7.4m/s {CJ Class 6/Outstanding 7 4-7.9m/s [J Class 7/Superb >7 9mis |Gaced on NREL-validatedAWS Truawind 2010 map joaoeastrs€ loe Auto 2Red:2/9/13 Per Hydropower Reconnaissance Report for Kake,Alaska -2013 Introduction Existing electrical load in Kake is approximately 350 kW without Cold Storage operations,approximately 800 kW while the Cold Storage is running.The local utility is owned by IPEC and they run diesel generators to produce electricity.Approximately 216,000 gallons of diesel was burned for electricity in 2012 at a total cost of $860,000.The cost of electricity in Kake during 2012 was 63 cents per kWh.State PCE subsidies for Kake residential energy totaled $480,000 in 2012 (see attached PCE stats page). Currently,the PCE only applies to residential use that does not exceed 500 kWh. Hydropower development options near the community of Kake are limited because of relatively gentle topography and regionally low precipitation,however,both Gunnuk and Cathedral Falls systems have been evaluated to some degree in the past.In recent years the State of Alaska and IPEC have been focusing on developing the Kake-Petersburg Intertie for delivering hydroelectricity to Kake. The Kake-Petersburg Intertie (KPI)has been studied by consultants and agencies for over 10 years and has been discussed as an infrastructure need for at least 40 years.Recent studies have concluded that the KPI cannot provide a guaranteed supply of hydroelectricity to meet Kake's total load forecast because of contractual obligations to the communities of Wrangell,Petersburg and Ketchikan (see Kake- Petersburg Transmission Intertie Study Update,2012).The 2009 estimated cost of the KPI is expected to be 30-40 million dollars resulting in an estimated consumer side cost of approximately 34 cents per kWh.In light of this information we believe it is worth taking another look at local hydropower options to complement a possible KPI. Basic Stats for Hydro-feasibility in the Gunnuk Creek Watershed e The Gunnuk Creek watershed is approximately 10,000 acres. e There are approximately 38 miles of stream in the watershed. ©The land is owned by SEALASKA and Kake Tribal Corporations and there is a SEALTRUST conservation easement within the watershed (see attached map). e There is an existing dam at 125 feet elevation that was designed to provide reliable drinking water and run of the river power (up to 11 kW)for the Gunnuk Creek Hatchery. e The Hatchery currently has access to 22 cfs of flow for overall operations. e Asmall take (Alpine Lake)exists in the upper reaches of a secondary tributary to Gunnuk Creek and currently provides drinking water to the community.Approximately .5 cfs is currently required to meet local water consumption.Community water was historically provided by Gunnuk Creek at the 125'dam site but is now being pulled from Alpine Lake because of economic considerations.There is concern in the community that the Alpine Lake site provides a 'less healthy water supply because the lake is relatively stagnant.Development of a hydro-facility could allow for returning the water tap to the Kake Dam and improving drinking water quality. e Based on USGS flow data for 2005-2008,annual mean flow at the hatchery site ranges from 77 cfs to 111 cfs,monthly mean flows range from 36 cfs to 167 cfs,daily mean below 40 cfs occur approximately 45 %of the total USGS record and for up to 5 weeks at a time,daily mean below 60 cfs occur approximately 58 %of the total USGS record and for up to 5 weeks at a time. Hydroelectrical Development Options A study was conducted in 1977 that looked at developing hydroelectrical power in Gunnuk Creek by impounding the primary tributaries into a 586 acre lake (see attached).The study estimated that this reservoir could provide a continuous flow of 75 cfs to a 1,000 kW powerhouse. Alternatively,we have been studying the possibility of creating smaller reservoirs (136 &141 Acres acres)in two different tributaries of the Gunnuk Watershed (see attached). In the Alpine Lake Scenario,the reservoir would be used to augment total Creek flows during low flow periods in a run of the river scenario that would include an intake at 330 feet of elevation and a 2.5-2.75 mile penstock (depending on powerhouse location).Flaws into Alpine Lake basin are unknown but are estimated to be an annual mean of 7.5 cfs.There is an out of basin opportunity for augmenting flows to Alpine Lake from the Turn Mountain watershed that is estimated to have an annual mean of 7.5 cfs. In the Gunnuk Lake Scenario,the reservoir would provide the sole source of flow to the powerhouse. Annual mean flows to this reservoir are estimated at 13.5 cfs.There is an out of basin stream nearby that would provide an additional annual mean of 9 cfs and derives from elevations and slopes that may be favorable for capturing late spring snow melt .This scenario would require less fill,would capture more flow at the reservoir and provide considerably more head than the Alpine Lake Scenario but it would require a longer penstock (4.4 miles vs.3 miles). Some questions that need to be answered to better understand the feasibility of these designs are: 1.Can these reservoir designs be maintained by existing +out of basin flows under adequate power generation scenarios? 2.Which,if any,of the designs are economically feasible? The table below summarizes a rough estimate of power availability for the two designs described above. Alpine Lake Scenario KWat20cfs |KWat40cfs |KWat60 cfs Power Available at Dam Site (200'Head)268 531 799 Power Available at Hatchery Site (300'Head)370 734 1105 136 Acre Reservoir Capacity (in days)397 200 133 Gunnuk Lake Scenario KW at 20 cfs KW at 40 cfs {|KW at 60 cfs Power Available at Dam Site (400'Head)536 1062 1897 Power Available at Hatchery Site (475'Head)634 1256 1890 141 Acre Reservoir Capacity (in days)198 100 67 Initial reconnaissance of the Alpine Lake option suggests that it would be worth conducting some stream gaging and rough design work for cost-benefit analysis.The attached map indicates the location of three gaging locations that would provide information on out of basin water supply,existing lake recharge rates and total combined flow at a possible intake site.Our hope is that IPEC,the city of Kake,Kake Tribal Corp and the Organized Village of Kake would consider using this report as a basis for submitting a joint proposal to AEA to develop a more robust feasibility study Gunnuk Creek Hydroelectrical potential. Community Population Last Reported Month No.of Monthly Payments Made Residential Customers Community Facility Customers Other Customers (Non-PCE) Fiscal Year PCE Payments Kake PCE Utility:INSIDE PASSAGE ELECTRIC Reporting Period:07/01/11..06/30/12 557 June 12 235 16 S6 $479,138 Lag bem < PCE Statistical Data PCE Eligible kWh -Residential Customers 893,785 =|Average Annual PCE Payment per Eligible $1,909 Customer PCE Eligible kWh -Community Facility 238,531 jAverage PCE Payment per Eligible kWh $0.42 Customers Total PCE Eligible kwh 1,132,316 Last Reported Residential Rate Charged $0.63 (based on S500 kWh) Average Monthly PCE Eligible kWh per 317 Last Reported PCE Level (per kWh)$0.42 Residential Customer Average Monthly PCE Eligible kWh per 1,242 Effective Residential Rate (per kWh)$0.21 Community Facility Customer Average Monthly PCE Eligible Community 36 =|PCE Eligible kWh vs Total kWh Sold 43.4% Facility kWh per person Additional Statistical Data Reported by Community* Generated and Purchased kWh Generation Costs Diesel kWh Generated 2,886,541 Fuel Used (Gallons)216,348 Non-Diesel kWh Generated 0 Fuel Cost $862,275 Purchased kWh 0 jAverage Price of Fuel $3.99 Total Purchased &Generated 2,886,541 Annual Non-Fuel Expenses $580,032 Non-Fuel Expense per kWh soid $0.22 Consumed and Sold kWh Efficiency and Line Loss Residential kWh Sold 1,078,439 Consumed vs Generated (kWh Sold vs 90.4% Generated-Purchased) Community Facility kWh Sold 247,737 Line Loss (%)7.8% Other kWh Sold (Non-PCE)1,283,806 Fuel Efficiency (kWh per gallon of diesel)13.34 Total kWh Solid 2,609,982 Powerhouse (PH)Consumption kWh 51,800 Total kWh Sold &PH Consumption 2,661,782 Comments *The data contained in this report is primarily based on information submitted by the utility with their monthly PCE reports.Changes to the reported data and/or significant anomalies have been noted in the comments. Page 74 of 179 Legend "\W Anadromous Streams "™".,Gunnuk-streams Other Non-USFS Lands €)usrs Lands Cj State Lands OC}City of Kake Lands Cc)Sealaska Comoration Lands Cc?)Kake Tribal Corporation Lands m x= :i SA hsLfNSE'7 Gp ar .wen yy 4 me ae[Fad x EE SoNeentreFSF SoyTeneand <=a hita=Hy \ = almy”,ft 4 'Less > yeeRO. , s modOs tare ay sihee tsksftateopeffd8btbsbaboatSOE PRELIMINARY APPRAISAL REPORT"HYDROELECTRIC POTENTIALfeLosteet FOR ANGOON HYOABURG KLUKWAN CRAIG KAKE PELICAN HOONAH KASAAN YAKUTAT KLAWOCK STATE OF ALASKA ALASKA POWER AUTHORITY IS77 prepared by Ble An Fe COPYROBERTW.RETHERFORD ASSOCIATES PROPERTY OF:POST OFFICE BOX 6410 Alaska Power AuthorityANCHORAGE,ALASKA 99502 334 W.5th Ave.Anchorage,Alaska_99501 D.Kake . Two sites were considered worthy of investigation forthisstudy.The Sanborn Cutting Company developed a small hydro plant on Gunnuk Creek circa 1920.Part of the old wood stave penstock is still in evidence.The City of Kake has constructed a timber buttress dam across Gunnuk Creek with a crest at elevation 180 and uses a portion of the flow for their potable water.A new highway bridge is under construction .crossingCathedralFallsCreekapproximatelyone-quarter mile upstream from the falls.Highway access is available to both sites and excellent materials for earth-fill dams are abundant. Gunnuk Creek The mouth of Gunnuk Creek,in latitude 56°58'N,and longitude 133°56'W,discharges into Keku Strait andflowsthroughtheCityofKake. There are 11.5 square miles draining to the diversiondamatthe180-foot elevation.Discharge measurements|have not been made.The watershed is low and lies ina belt of comparatively low precipitation.The mean discharge is estimated at 86-cfs or 7.5 cfs per square mile and the nominal discharge at 10.cfs. The existing timber buttress dam provides forebay storage only.Storage for complete regulation would heprohibitivetoobtainatthissite.A suitable storagebasinexistsatapproximatestreammile3.5.Two earth fill dams would be required,one on each fork of the two southerly flowing branches of the stream.This would create a reservoir with a surface area of 586 acres and provide 14,500 acre-feet of storage.This would regulate 75 cfs flow at the existing dam. A penstock 2800 feet in length would convey the watertoapowerhouselocatedattidewater. The power capacity is estimated at 875 kW primary and 1000 kW average.Two 900 kW units are recommended for the installation.The voltage would be stepped-up to7.2/12.47 kV and fed directly into the distribution system.Transmission will not be required. This development would also assure Kake of a reliable source of potable water.. -33- sien arlaiier dill <a A REa na )-y--"wee 2000eesvera75..en GUNNUK CREEK & CATHEDRAL FALLS CREEK PLATE 6 -_ crisesSf LEP AGS heerw x C3CcS2 5 n 5 ,;4 "fii A i .. THNGAT 7/ V0 CSE K GAo<) (GSS7 i /we a ;é 8 'an.cs é .- : aePd ie ar) SsPePSR ir a uml D 3;Ow©os ;£an od -_x.oe -\ ' ane .-4-'.er ae cdCO"Ve!4 .ab » )Legend 3 "\.Anadromous Streams Elevation Zones in Feet B NS Gunnuk-streams C)0-25 ©Potential Gage Site {__}25.00000001 -128 F ah tT,(2)Intake Site ("}125.0000001-300 _Ley a ES A ; Of pe ervolr f..);A\Powerhouse Site '|300.0000001 -350 Egnn8 :LES a } =.: Ly pat hn ATLASoAWewoei}Pay Hi PEL AN \ENS jmpoundment Dam tC)350.0000001 -565 -y hi .")_F;a a a o™,*" 7 ;Ay Run of River Penstock C7)565.0000001 -875 f C .CE om iy Wate rshed ! ¥Mm ew Supplemental Flow Penstock C)675.0000001 -1.500 .1,500.000001 -3,920 NESSe 2S SE VY 500'Intake SiteSead\<2 SEEN >)\((:7 WF et =< AQIS SLT YW ZEGe,j Y bh ESSE . (we 2\UA -\SS mmwoOonmrma oom oD eo oo eo ol Oe he Ce E3 Predicted by USDA Regression from Hatchery Precipitation EiFrom Gage at Hatchery 1986-1994 no} wey =) ©Bo,Ss 140 wo .:r _. .se mercneteemetermtemeg meee footg .o>120 ,bl . S on oe Q ."<. 100 +7 2 ae r- By :;aoe i:-bes ...eo .Pas ee Bg .oa .wee =: [o)4 oe E a 2 Zu 'ix ;1 7AreeyA: &=:;ar @ =%or 6 "pod Lis -%° <a ae ng5aa,1,''+, o ie aA:; Yjoeae2poUy,=ke "4 i of: aT."ye ie on 7 4 an ae oe "ag y :ae ajay ¥+4 "ee . fs %3%Ai aie Lia 4:fA iBeege20aa A.di {ni f Q PR ee way BA :y :ie ySy.Te a ae 'Mh : .oe i a4.Ye te "0 -+t amen fetid nt June July Aug Sept Oct Nov Dec Mean Annual Month Flow BNSETY'oxeYJOANDqjB-g=2>3=2Figure 4 Gunnuk Creek Streamflows 873 USGS Surface Water data for USA:USGS Surface-Water Daily Statistics PAUSESScienceforachangingworldy»Kotrenal Woiter Peferea cute fyeteaa Vaso te pote foe el ne Surface Water [-]United States ]"60, Click for lessNews Bulletins e August 7,2013 -Upgrade completed°Full News (3 USGS Surface-Water Daily Statistics for the Nation The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications.The user is responsible for assessment and use of statistics from this site.For more details onwhythestatisticsmaynotmatch,click here. USGS 15087565 GUNNUK C NR KAKE AK Love ett t Time-series:Daily statistics _-"s GO | Wrangell-Petersburg Division,Alaska Output formats | Hydrologic Unit Code 19010202 HTML table of ail dataLatitude56°58'44.5",Longitude 133°55'48.1"NAD83"Tab-separated dDrainagearea15.4 square milesGagedatum175feetaboveNAVD88 Reselect output format. 00060,Discharge,cubic feet per second, - Day ||Mean of daily mean values for each day for 3 -3 years of record in,ft3/s_(Calculation Period 2005-10-01 ->2008-09monthJanFebMarAprMayJunJulAugSepOctNovDe 1!496]67 2s ill io9 41l is'45 522,6a 133] 2 |245||55!36!23 173i 623 32 110)43!165 3 |223.21 371 30l 14s]81.12|[23 41 371 61, 4 |__93]44]27|35l 149 75l 291 18||35 199)42 5_|106 4c _42[_sof 126 50 99 27 81 157|43 6!120 5éll 232!276i 218 36!27 22 54;88 45]. {7 |51 286 194]287 132,29)is{18 68 58 32. |8 |33 _83]95 2411 go 24d 40 67|_«63 73l 55 9 |83 27,90 188 67 23 148 23 36|101]152 10 |66,22 48 120 126.2)246['13 1361 136 154| {11 |28 35!41 135!142 19]76,12 ii 2274 71 12 |55 212!34 383}151 31 43],37 83)126!61, 13 |48 116[24 _337 se 33]97 53)218 45] 14 |41 92,20 153]129 20 29 56 45]190]66! 15 |339 130,17 152!138 20)20 23 107 105 79, ig {|_126 84 iol _-_-isol|_ios 20]_48 25||_47)77 123 17 |66 155 38 109!204|20 Sil 26 52|72!ae 18 |120 89 54!132 87 24!24!26 37\88)75 19 |97 _64 32 85 65 231 60 17 60!1i9l 117) 20 |.52 9 25)80]7ol sf Ba}ills Bol 131] 21 |'109 112 34 81 66;_34 150 ii 135]148 430, 22 |98 44 118)84]56 26!62:11 ga!281!403] 23 114 25 146)222,sit sil 49 62 112 296)209 24 219 21 901 269 Bil 28!41 Bs,452 161]133]25 |_72 18 681-154 75°162|_ail 50 125 157)sol[26 |34 28,62 156 78 69|_77 35]ail _ie4[.62|_27 |25 88 44 245 55,37 44 35 80)122|39 28 20 54 41 277]46 53 55 50 3431 64l 32 29 i)aE 35 223.gi[24 93 40 280:74 26| 30 17 27 is4{95 19[43]31 82;209,18 31 |20!23 ;-4a '41!99 -281 i nwis.waterdata.usg s.gownwis/dvstat?referred_module=sw&site_no=15087565&por_15087565_1=2233916,00060,1,2005-09-01,2008-09-308amp;format...1/2 Legend4Potential Gage Site Ce}intake Site A\Powerhouse Site XSympoundment Dam xe Run of River Penstock Elevation Zones in Feet (_)0-25 (_}25.00000001 -125 £}125.0000001 -300 (-_}300.0000001 -350 PX Supplemental Flow Penstock{__}350.0000001 -565 "\N Gunnuk-streams "\Anadromous Streams (__}565.0000001 -675 (__}675.0000001 -1,500 {}1,500.000001 -3,920 glroeabead"N verCNiePatamenOd . " Wl Saw Alpine Lake Reservoir })\\<F2 APIMONES A k Lake”Reservoi "=ote uy my r .: Karl Reiche From:Douglas Ott Sent:Friday,August 09,2013 11:40 AM To:Karl Reiche Subject:FW:Kake hydro FYI From:Katie Conway Sent:Friday,August 09,2013 11:18 AM To:Douglas Ott Subject:RE:Kake hydro Adam H.L.Davis Community &Economic Development Specialist Email:adamd@kakefirstnation.org Office phone:907-785-6471 x121 Cellphone:907-518-0961 Katie Conway Assistant Program Manager -Energy Efficiency and Conservation Alaska Energy Authority 813 W.Northern Lights Blvd. Anchorage,Alaska 99503 p:(907)771-3078 f:(907)771-3044 www.akenergyauthority.org EO?:aken Cigyefficiency.org Solutions for Aloska From:Douglas Ott Sent:Friday,August 09,2013 10:25 AM To:Katie Conway Subject:RE:Kake hydro Katie, Can you give me Adam's last name and any other contact info? Thanks, Doug From:Katie Conway Sent:Friday,August 09,2013 9:41 AM To:adamd@kakefirstnation.org Cc:Douglas Ott Subject:Kake hydro *HiAdam.I just passed your hydro report to Doug Ott,our hydro program manager,who said he'd give it a look and get back to you.I'm sending this email so you two have each other's email addresses. Thank you Doug! Katie Conway Assistant Program Manager -Energy Efficiency and Conservation Alaska Energy Authority 813 W.Northern Lights Blvd. Anchorage,Alaska 99503 _p:(907)771-3078 f:(907)771-3044 www.akenergyauthority.org Ey fe SoA aKenergyJefficiency.org Solutions for Alaska Karl Reiche I.$o-Genn ule ze? To: Subject: Attachments: Folks- David Lockard Friday,May 10,2013 5:12 PM Audrey Alstrom;Douglas Ott;Karl Reiche FW:Gunnuk Creek Screw Generator Proposal Gunnuk Creek Energy Estimate Draft-modified by SBIxlsx;SBI Q11185 -Gunnuk Creek.pdf |just ran across this analysis and thought it might be worth a look. David From:Earsley,Joseph [mailto:jearsley@hatchusa.com] Sent:Wednesday,September 28,2011 10:29 PM To:Gwen Holdmann;David Lockard Subject:FW:Gunnuk Creek Screw Generator Proposal Hello Gwen and Dave, Thanks for the excellent company at dinner tonight.|really enjoyed myself.Here is the Kake proposal from Spaans Babcock. 'oy rs, From:Craig Trombley [mailto:ctrombley@spaansbabcock.net] Sent:Friday,August 19,2011 2:07 PM To:Earsley,Joseph Subject:Gunnuk Creek Screw Generator Proposal " Joe, Attached are the details for our generator selection. |listed our yield values vs occurrence on your spreadsheet. We didn't include the control panel at this stage. Consider pricing preliminary/budgetary. The idea is to fit this in a 45 ft container (two containers required).We may need some small adjustments if we get into a detailed design.Any larger and it definitely won't fit in container which would make the freight costs much higher. e The drawing included is for reference only to show you the style of trough we selected and give an indication of the concrete works required.We can talk about layout changes as we go to figure out what makes sense for the site. |hope this |sufficient for now and hope this is the one.Let me know what else you may need. Best regards, ©...Trombley Spaans Babcock Inc.|80 Toronto Street «Barrie,ON Canada ¢L4N1V2 | 1 ' www.spaansbabcock.com |T 905 884-1100 |F 905 884-8811 |M 416 707-3530 | NOTICE -This message from Hatch is intended only for the use of the individual or entity to which it is addressed and may contain information which is privileged,confidential or proprietary.Internet communications cannot be guaranteed to be secure or error-free as information could be intercepted,corrupted,lost,arrive late or contain viruses.By communicating with us via e- mail,you accept such risks.When addressed to our clients,any information,drawings,opinions or advice (collectively, information")contained in this e-mail is subject to the terms and conditions expressed in the governing agreements.Where no such agreement exists,the recipient shall neither rely upon nor disclose to others,such information without our written consent. Unless otherwise agreed,we do not assume any liability with respect to the accuracy or completeness of the information set out in this e-mail.If you have received this message in error,please notify us immediately by return e-mail and destroy and delete the message from your computer. 80 Toronto Street Barrie,Ontario,Canada,L4N 1V2ors,SPaans Babcock cases Tel:(905)884-1100 Fax:(905)884-8811 www.spaansbabcock.com2 August 19,2011 Mr.Joseph Earsley Hatch Engineering 6910 Potter Heights Drive Anchorage,AK 99516 Re:Gunnuk Creek Dam Archimedes Screw Generator Our ref.#Q11246 Dear Mr.Earsley, Upon review of the flow duration curve provided,we have come up with a Spaans Screw Generator selection as follows: 1 x ZT2200 Spaans Generator: ZR2200,Self supporting trough,design flow =67 cfs,available head =18 ft,26°incline Generated Power =77.5 kW Rated Power =90 kW This offer includes:Screw,bearings,trough,covers over the screw,generator and drive components,inlet gate,hydraulics,all mechanical,electrical and hydraulic equipment. Not included:lifting,installation works,control panel,civil work,cable trenching,control and drive train cubicle,high voltage cabling,earthing and grid connection. Please don't hesitate to contact the undersigned if you require any additional information. Email:ctrombley@spaansbabcock.net Spaans Babcock List of Contents Chapters and Appendices 1 MECHANICAL EQUIPMENT. 1.1 SCREW GENERATOR 1.2 TROUGH -ZT 1.3 WEIR GATE 1.4 HYDRAULICS 1.5 UPPER BEARING 1.6 LOWER BEARING 1.7 BRAKE 1.8 GUARDS AND SCREENS 2 ELECTRICAL EQUIPMENT. 2.1 TRANSFORMER AND GRID CONNECTION 2.2 ELECTRICAL SUPPLY IN CONTROL CUBICLE 2.3 CONTROL PANEL 2.3.1 General overview 2.3.2 Control Philosophy 3 CIVILS 4 INSTALLATION 4.1 MECHANICAL INSTALLATION 4.2 ELECTRICAL INSTALLATION 5 TESTING,COMMISSIONING AND TRAINING 6 SAFETY 6.1 APPLICABLE HEALTH &SAFETY LEGISLATION 7 MAINTENANCE 8 WARRANTY 9 OFFER 9.1 INCLUSIONS AND EXCLUSIONS 9.2 TERMS AND CONDITIONS APPENDIX A PRICING SUMMARY APPENDIX B TECHNICAL DATA SHEET APPENDIX C CURVES APPENDIX D REFERENCE DRAWING Page ERROR!BOOKMARK NOT DEFINED.wuffffhhWWWwWwo©©OoNNNNNNNNOOwwwBerROo113 115 117 Page |2 _><>Spaans BabcockZ 1.1.Screw generator The Screw Generator offered is fabricated to our own Lloyds approved welding procedures in line with our ISO 9001 Certification and coated as per the Data Sheet with a very durable High Solids two pack epoxy coating suitable for the environment.The turbine consists of an Archimedean screw body.Appendix B contains the technical data. 1.2 Trough-ZT Self supported steel trough The steel trough is completely self-supporting and shipped with the hydrodynamic screw placed in the trough.The trough is completely coated and includes necessary fasteners,stiffeners,and flow deflection plates for ease of installation.The bearings are shipped loose and must be attached to screw at the jobsite prior to installation.Bearing bases are to be grouted into place once the screw and trough assembly is placed into the correct position on-site.All parts including high efficiency generator with gearbox,brake,couplings,bearings and necessary guarding are usually pre-mounted on a separate steel foundation table where possible and aligned and delivered to site as a complete drive foundation package but are not integrated into the trough section.Two supports are necessary:one on the outlet section and one for the flange on the inlet section.No intermediate trough support is necessary along the trough length saving significant civil cost.The drive foundation is mounted separately from the trough at the jobsite and aligned in the field.Behind the screw in the concrete inlet section slots must be formed;one for the gate and one for the stop logs for isolation of the inlet water in case of maintenance. 1.3.Weir gate This is a professionally built weir gate to industrial standards offering a very robust construction and long life time.The sluice gate will open and close under hydraulic pump pressure and will shut quickly upon an urgent shutdown routine or power failure (failsafe close).The hydraulic unit will be controlled by the electrical control panel.We have included for the hydraulic unit with motor and pump.The sluice gate will be fabricated from mild steel,shot blasted to SA2.5 and coated with 2 x 150 microns of black epoxy or is galvanised.The gate is designed to hold the head of water on the upstream side of the generator.It is designed to have minimal clearances and allow a very small percentage of leakage into the screw inlet chamber.This leakage will flow down the screw in such small quantities that it will freely pass between the flights and trough without driving the screw.All fixings for the weir gate subjected to immersion in the flow shall be stainless steel.The sluice gates will be grouted into the concrete section. Page |3 »Spaans Babcock 1.4 Hydraulics The design of the Hydraulic systems is such that it is only operational when the actual gate movement is required.This keeps wear and operating costs to a minimum.The oil selected for the hydraulic unit is environmentally friendly.The hydraulic oil is supplied to the cylinder via stainless steel over braided hydraulic hoses from the hydraulic unit.Extra pressure will be provided in the case of loss of grid connection via accumulators this provides a guaranteed shut down event even in cases when debris is situated in the guidance system of the gate.This will prevent major damage caused by over speeding of the screw,gearbox and generator in the event of a brake failure. 1.5 Upper bearing The upper bearing is designed to prevent ingress of water in the event of flood conditions.It is fitted with seal arrangements on both sides and grease is pressurised in the housing by anautomaticnon-electric grease lubricator. 1.6 Lower bearing The lower bearing is a sealed for life Eco bearing from our standard range.They are designed to give many years of service without any maintenance whatsoever.Unlike oil filled bearings there is no risk of leakage of lubricant to the water course and no electrical consumption as required by oil or grease pumps. 1.7 Brake The equipment is fitted with a brake mechanism.This gives an additional shutdown facility in the event of power failure or gate failure.The brake is fitted between the motor and gear unit. 1.8 Guards and screens All equipment is fully guarded to meet the requirements of the latest OSHA standards.Each inlet channel is situated with a 2.5 m wide bar screen.Because the civil design is not finalised especially the length and width of the inlet section,covering is limited to the screw section by heavy duty galvanised covers locked into position.An additional price for any additional covers required will be given when the civil design is complete. Page |4 pod >Spaans BabcockWy 2 Electrical Equipment. 2.1 Transformer and grid connection This is not included in this quotation. 2.2 Electrical supply in control cubicle The electrical arrangements should be such that the cubicle has its own separate supply for lighting and power sockets even when the generators are not running. 2.3.Control panel 2.3.1 General overview The control system is to start,stop and control the screw generator and ancillary equipment completely automatically,the technical details are given below. The control panel is not included in this proposal at this time as the requirements are not known. 2.3.2.Control Philosophy On the upstream side in front of the inlet bar screen there is a single level sensor in a stilling tube.This level sensor measures the level of the upstream river water and is set to maintain the system to a minimum hands-off flow (if applicable)over the dam. On the inlet to the generator a second single level sensor is positioned to provide feedback of actual intake level for control calculating and calculating of flow data for the EA if required. As an option a level sensor in a stilling tube can be placed behind the bar screen to check for head loss across the bar screen (debris).An alarm will occur when the head loss is above a certain set point. Additionally level sensors can be placed between the gate and the screw,on the downstream outlet side and in the lower river level to measure the actual head and check for outlet screen blockage.These can be used for alarm purposes also. Start up: The brake on the generator will be powered to allow the motor /generator to turn. The screw is started using the flow and the soft starter and by opening the weir gate,it is brought up to its synchronous speed switching to generating mode.A G59 relay monitors the site to ensure compliance of output.Very low starting currents are generated. Page |5 >Spaans Babcock Generating mode: The river level is measured constantly and the control panel controls the flow rate by opening or closing the weir gate.The level over the weir is permanently controlled in line with the given hands off flow and will be monitored continuously.If the flow which is allowed to be used is below the design flow of the turbine,the gate will be lowered or screw speed reduced to maintain the hands off flow in the river.In some instances during dry periods this will shut down the screw on low power. Shut down:, Occurs when the flow is too low for power generation,is approaching minimum level or someone activates the shutdown procedure,the gate will close slowly until there is insufficient flow to maintain generation.At this point the unit will be disconnected from the grid and allowed to coast to a complete stop.Once stopped the brake will be activated in order to apply the mechanical force of the brake to prevent rotation accidentally.The screw will now be in shutdown mode. Emergency shutdown: In an emergency shutdown procedure,the screw turbine will be disconnected from the grid immediately.Simultaneously the brake will be applied which is normally closed (brake torque by springs)and the gate will close quickly using a dump valve and sometimes accumulators. Page |6 _>Spaans Babcock 3 Civils Civils and trenching are not included.We assume the road access is suitable for delivery of equipment. 4 Installation 4.1 Mechanical installation This is not included in our quote 4.2 Electrical installation This is not included in our quote.Spaans Babcock will deliver a cabling diagram. 5 Testing,commissioning and training All our equipment is factory tested (FAT)where possible and tested on site (SAT)prior to commissioning.Testing documents will be provided including a commissioning report.Training will be provided to the operator whilst on site and commissioning.After commissioning to the satisfaction of the client,operation and maintenance manuals will be provided within 3 weeks of completion along with as built drawings and data settings. 6 Safety 6.1 Applicable Health &Safety Legislation Spaans Babcock Inc.considers safety to be paramount to the success of any project and our business as a whole.All our sites operate under planned specific procedures to ensure that all activities are properly executed with safety at the forefront. Page|7 <>Spaans Babcock<<y7 Maintenance Spaans Babcock has factory trained service engineers specialised in our products.We can offer remote monitoring and control of the day to day maintenance if required or can be called upon when needed to attend site or investigate remotely for any issues that may arise within or outside of the warranty period. Spare parts availability is ex stock Barrie,Ontario,Canada for Upper and Lower Bearing parts. Other parts are subject to delivery.However most electrical parts will be ex stock locally and specialised parts can be shipped within 1-2 days from our works in the Netherlands. Spare Parts are kept on stock permanently as all bearings used are standard Spaans designs. 8 Warranty This proposal is made on the basis of a 12 month defects correction period.Under this warranty any defect which is as a result of poor materials or workmanship will be rectified at no cost to the client. Page|8 \<>Spaans Babcockr 9 Offer All options include the above mentioned aspects.A break down price can be found in Appendix A. 9.1 Inclusions and Exclusions 1.Inclusions (unless specifically excluded in our offer) Standard Spaans Babcock Operating &Maintenance Manual Information. Standard Test Certificates where applicable. 2.Exclusions (unless specifically included in our offer) Power washing the equipment and surrounding working area pumping down and maintaining the whole of the work area free from inundation at all times. Repairs to replacement of and delays caused by:-broken damaged or corroded parts. Other additional work essential but only revealed whilst work is in progress. Bypass pumping of incoming flows. Electrical works and materials other than detailed in our quotation. Civil works and materials other than detailed in our quotation. Any rescue teams deemed necessary by the client for the work. Charges for delays or additional work will be in accordance with our Day work schedule a copy of which is available on application. Page |9 vypa Spaans Babcock " 9.2 Terms and conditions Validity Price Basis Time for Delivery 60 days from today's date. Fixed for validity and delivery periods quoted. Currently 20-24 working weeks from receipt of down payments, approval of our contract drawing or an instruction to proceed with manufacture whichever is received later. Delivery dates can only be confirmed at the time of order. Delivery Value Added Tax Terms of Payment Liquidated Damages : Consequential Losses: Packing &transport included. All prices exclude value added tax which will be added where applicable to the final invoice price at the current rate. 5%-with order 25%upon fabrication release 60% ondelivery of equipment 10%oncompletion. Spaans Babcock Inc.does not accept liability for Liquidated Damages. Spaans Babcock Inc.does not accept liability for Consequential Losses. We trust our proposal meets with your requirements however if you should have need for any explanation of our proposal or additional information please do not hesitate to contact us. Cell:(416)707-3530 Email:ctrombley@spaansbabcock,net Page |10 <>Spaans Babcock Appendix A Pricing Summary Item |Description Qty Total price $US 1 |Spaans Screw Generator System:1 90 kW Generator Assembly: ¢|Spaans Babcock Archimedean screw turbine:ZT-2200- 90kW-ECO «complete screw generator with self supporting steel trough, including flow deflection plates,lower bearing,upper bearings,splash plate,speed reducer,flexible coupling, motors,directly coupled generator,guards,baseplates, factory applied epoxy coating. Premium efficiency electric generator Covers over screw first fill of all lubricants gearbox baseplate emergency brake flexible coupling and safety guards all fasteners and anchors . 2 |Sluice inlet gate: Sluice gate for installation in a civil construction including hydraulics Width =TBD Height =TBD frame for installation in a civil construction heavy-duty sluice gate hydraulic cylinder hydraulic reservoir hydraulic electric pump control unit for opening,closing,and emergency closing; operated by screw generator control panel ¢all fasteners and anchors ¢gearbox baseplateeeee°°eocdeNote:dimensions given are indicative.Exact dimensions will depend on the civil construction 3 |Electrical control panel:(Not included at this time) Page |il >Spaans Babcock 4 |Inlet bar screen Inlet bar screen to prevent large debris from entering the screw «Width =TBD «Height =TBD *Bar spacing =6 inches Note:dimensions given are indicative.Exact dimensions will depend on the civil construction 5 |SITE SUPERVISORY ASSISTANCE:lot Two site visits of five days each for installation supervisory assistance,start-up,commissioning and training. TOTAL LUMP SUM PRICE FOR ITEMS 1 to 5:$292,400.-- Pricing 1s piven EX-works Balk,Netherlands Page |12 <>Spaans BabcockWy Appendix B:Technical data sheet Page |13 Project Gunnuk Creek Dam,Kake (AK)<nTendernr.US-11246 i Ten Us-11246 ap,SPaans Babcock TECHNICAL SPECIFICATION Number of screws 1 Type Steel trough Generated power 104 Hp (77.55 kW) Flow 67 CFS (on generator terminals) Rotation speed 32.4 rpm Diameter 87"Head 17.72 ft Pitch 87°Upper Waterlevel 17.72 ft Number of flights 3 Downstream Waterlevel O ft Inclination (B)26°Upper TouchPoint 14.47 ft Flight thickness 0.315"Downstream Touchpoint -3.24 ft Length Of Flights 485”Weight of screw Tube 40"x0.375 ”(including bearings)21260 lb Length of tube (Approx.)535"Total weight 41540 lb E-MOTOR/GENERATOR Manufacturer or equal WEG_Nema Anti-condensation heater No Type 444T Thermistor PTC's Power 120 Hp Efficiency 95.4% Speed 1820 rpm Nominal current at 60Hz 138 A Electrical connection 460/3/60 Power factor 0.86 Degree of protection IP55 Efficiency class Premium Efficiency Insulation class F Insulated endbearing No Mounting arrangement B3 Enclosure TEFC Starting Softstarter ATEX N.a. GEARBOX BRAKE Manufacturer or equal Flender Type Sibre Drum brake Type H3SH 10 (with external torque spring and electro-hydraulic Transmission ratio 56.187 thrustor), Nominal torque 32305 lbft Oil contents (approx.)included .USG Type of oil PAO COUPLING BEARINGS Type RWN560 Upper bearing LGB 34 Nominal torque 28765 Ibft Lower bearing ECO 24 Greasepump N.a.INTERMEDIATE COUPLING Type N-Eupex with brake MATERIALS:drum Material screw pump body Steel (S235J) Material side profiles Steel ($235J) WEIR GATE PAINT SYSTEM Blasting (SA 2,5) Epoxycoating 300myp Excluding weir gate Powerpack excluded ©Spaans Babcock 2011.All above mentioned data are mean values and based on the Spaans Babcock standard design and cannot be seen as strictly binding.We reserve the right to modify our technical specifications. Generated power is based on above mentioned data and cannot be seen as a guaranteed value.Deviations in waterlevel,water quantity and technical componants will result in deviations in generated power. Losses in VSD device and/or cable losses are excluded in our calculations. Cc»Spaans BabcockWw Appendix C:Flow,Head,and Power Curve Page |14 Flow(m3/s}andHead(m)7.40 7.20 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 $.40 5.20 5.00 4.80 4.60 440 4.20 4.00 3.80 3.60 3.40 3.20 3.00 2.80 2.60 2.40 2.20 2.00 1,80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 Flow,Head and Power output 1 x kW T_T|a en -__-=== * AY \ \ AY Ay rN AN \ im 7) =<_ = x =e = -= _ * 4 N XN * ss X\ w " ww a 5 x > a XN>.@ q a a "XN sy "nw ==a q K a ey a pond Ss pend X \y | S 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Occurrence (%)} 80.0 78.0 76.0 740 72.0 70.0 68.0 66.0 64.0 62.0 60.0 58.0 56.0 54.0 52.0 50.0 . 48.0 46.0 44.0 42.0 40.0 38.0 36.0 34.0 32.0 30.0 28.0 26.0 24.0 22.0 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 40 2.0 0.0 Poweroutput(kW)Wy>Spaans Babcock Gunnuk Creek Dam SBI Ref.:11246 -==Nett head (m) eee Usable flow (m3/s) om Flow over weir (m3/s) ---Possible power output (kw) <>Spaans Babcock Appendix D:Reference Drawing (included for descriptive purposes only.Dimensions are not site specific!) Page |15 SECTION A-A of step tagsFer From Gunnuk Creek Flow Duration Curve,67 CFS generator selection at 17.72 feet of head Hrs/yr 8760 Power Frequency Energy (MWh)St 0.99 Oo 0.975 0 0.95 0 0.925 0.01: 0.9 0.49 0.875 1.26 0.85 1.82 0.825.2.4 0.8 2.98 0.775 3,52 0.75 4.03 0.725 4.51 0.7 4.96 0.675 5.39 0.65 5.82 0.625 6.24 0.6 6.69 0.575 7,18 0.55 7.72 0.525 8.34 0.5 9.04 0.475 9.84 0.45 10.74 0.425 |11.74 0.4 12.86 0.375 14,15 0.35 15.62 0.325"16.76 0.3 16.75 0.275 16.75 0.25 16.74 0.225 16.73, 0.2 16.73 0.175 16.72 0.15:16.71 0.125 16.71 0.1 16.71 0.075 16.54 0.05 26.18 AnnualE Gallons Fuel 367.4 26241.43 3%downtime 356.36 Total Output including downtime (MWh) includes efficiency losses (churn,gear,gen,&drive) Vehhe -rtad scwurel Aipoant Kake,Alaska Wind Resource Report natichankaahuaiemenmadil Sfetls {Sex "|: ivA inch +Lich Str,4)-wlatic nwo pen "YO eplingy fanuwe wane &bw nial pon zWN Pre CO)Renn liad i -Te n wracipernrnconts goon catoemOSom. 7 eS ge AareRhgtveeRene)=Beer ee ", a at +=k _i 'as ' Ft eet!,'te See ZO aPeaeeneTaewrewerags6,ae a B 1 -".wea we et ae fe parser ;. *aan "et ye y .Ay a"ES HE m4 i:a " Kake met tower,photo provided (SEACC ) January 6,2012 Douglas Vaught,P.E. V3 Energy,LLC ae Eagle River,Alaska 1V3 Enercy LLC i Eagle River,Alasna 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |2 Project Background (from SEACC) In 2010,Southeast Alaska Conservation Council (SEACC)partnered with the Organized Village of Kake (OVK)and Kake Tribal Corp.to install a 34 meter meteorological tower as a first step in exploring wind potential near the village of Kake,Alaska.Like many other rural Southeast communities,Kake relies completely on diesel fuel for electricity,heating and transportation needs.At present,residents pay more than 60 cents per kilowatt hour for electricity and up to six dollars per gallon for heating oil, resulting in significant economic and social hardships in this Alaska native community.The Organized Village of Kake has been a leader in working to address these issues,and together they and SEACC are exploring sustainable ways of living in the Tongass Forest that preserves the region's world class environment,communities,and cultures.SEACC will continue to work with their partners at OVK,Kake Tribal Corp.and the State of Alaska to further explore the feasibility of wind power to deliver affordable, renewable energy to Kake. Summary The wind resource measured at the Kake met tower site is very good with measured wind power class 5 by measurement of wind power density (Class 4 if considering only mean annual wind speed).Given the moderately cool temperatures of Kake test site,air density is moderately higher than standard conditions,leading to the robust annual wind power density average.By other measures important for wind power analysis,the site has a relatively low extreme wind probability but high turbulence;thelatterapparentlyduetospecificsitingofthemettowernearamoderately€igh forested hill)It is unlikely though that the general area of Kupreanof Island experiences similarly high turbulence. Met tower data synopsis Data dates May 14,2010 to November 3,2011 (18 months);operational Wind power class Class 5 (excellent),based on wind power density Wind power density mean,34m 510 W/m? Wind speed mean,34m 6.61 m/s (14.8 mph) Maximum wind speeds 27.7 m/s (10-min avg);39.8 m/s (gust) Weibull distribution parameters k=1.52,c=7.27 m/s Wind shear power law exponent 0.328 (high) Roughness class 4.08 (description:suburban) IEC 61400-1,3"ed.classification Class III-B (at 30 meters),Class III-S (at 20 meters) Turbulence intensity,mean (at 34 m)0.126 (at 15 m/s) Calm wind frequency (at 34 m)43%(<4 m/s)(18 mo.measurement period) Test Site Location A 34 meter NRG Systems,Inc.tubular-type meteorological (met)towéris installed on a high headland on the northwest side of Kupreanof tsland approximately 7.7 kn7 (4.8 miles)straight-line distance northwest ofthe village of Kake,but 19 km (12 miles)by road.K&preanof Jsland hosts extensive forestry operations and compared to the original virgin forest cover,the site is relatively open and clear due to past logging activity.The site is well exposed to the south and west although a moderately high hill is directly east-northeast and much higher terrain exists a further 1.5 km to the northeast.This site was PF }V3 Enercy LLC we]Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |3 chosen because of its potential for wind power potential and its relative proximity to Kake.The wind resource Kake itself (at sea level)is tikely insufficient for wind power development due to topographic features and forest cover;however,there are hilltops closer to the village that warrant further study. Photo of test site,view to the northeast Site information Site number 5253 Latitude/longitude N 57°02.352”W 133°59.394” Time offset -9 hours from GMT (Yukon/Alaska time zone) Site elevation 390 meters (1,280 ft.) Datalogger type NRG Symphonie Plus,10 minute time step Tower type Tubular tall tower,6-inch diam.,34 meter height Tower sensor information Channel Sensor type Height Multiplier Offset Orientation 1 NRG #40 anemometer 34mA 0.758 0.40 Not recorded 2 NRG #40 anemometer 34mB 0.755 0.39 Not recorded 3 NRG #40 anemometer 20m 0.755 0.38 Not recorded 7 NRG #200P wind vane 34m 0.351 150 150°T 9 NRG #110S Temp F 3m 0.244 -123.5 N Topographic maps ;ro ie aeiesoe .can .Oe page ct REvomit [1V3 Entry LLCjwJEagleRiver,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |4 Hsbantt > ,f !4JerickSor -SILER ELIEG):Fier =a et EWS ¥ ios |"pl coe a *re 1s ofeee wt et©2015 Googie! 2011 Europa Techn "=image IBC Re A abate-oe Data Quality Control Data quality is very good with data recovery of all three anemometers greater than 98 percent and data recovery of the wind vane nearly 97 percent.Data recovery of the temperatures sensor was 100 percent.Data loss is limited to winter months only and undoubtedly attributable to icing events which are characterized by non-variant output of the anemometers at the minimum offset value (essentially F}V3 Enercy LLC5EagleRiver,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page [5S zero)and by non-variant output of the direction vane at the last operable direction.This occurs when the temperature is near or below freezing (0°C). Sensor data recovery table 3 mA_|34mB°20m Vane TempPossible_--Valid ecovery PRecovery Recovery |Recovery |RecoveryYearMonth'ecords-Record ate (%)|Rate (%)/}Rate (%)|Rate (%)|Rate (%) 2010 May 2,592 2,592 100.0 1100.0 100.0 100.0 100.0 2010 Jun 4,320 4,320 100.0 100.0 100.0 100.0 100.0 2010 Jul 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2010 Aug 4,464 4,463 100.0 100.0 100.0 100.0 100.0 2010 Sep 4,320 4,320 100.0 100.0 100.0 100.0 100.0 2010 Oct 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2010 Nov 4,320 4,204 97.3 92.7 97.3 84.5 100.0 2010 Dec 4,464 4,464 100.0 98.1 100.0 83.3 100.0 2011 Jan 4,464 4,330 97.0 97.0 97.9 92.9 100.0 2011 Feb 4,032 3,407 84.5 84.6 81.2 83.8 100.0 2011 Mar 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2011 Apr 4,320 4,320 100.0 100.0 100.0 100.0 100.0 2011 May 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2011 Jun 4,320 4,320 100.0 100.0 100.0 100.0 100.0 2011 =Jul 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2011 Aug 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2011 Sep 4,320 4,320 100.0 100.0 100.0 100.0 100.0 2011 Oct 4,464 4,464 100.0 100.0 100.0 100.0 100.0 2011 Nov 354 354 100.0 100.0 100.0 100.0 100.0 All data 77,538 76,662 98.9 98.5 98.8 96.9 100.0 Icing Event The Kake met tower site is at an elevation of 390 meters.Although destructive rime icing has been observed at this elevation elsewhere in Alaska,the Kake climate is too moderate for such conditions. But,freezing rain and other similar cold climate events do occur on occasion which can compromise anemometer and wind vane data.These are not likely however to seriously impede wind turbine operations. fF -1V3 Enercy LLCje]Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |6 Apparent icing event,February 2011,temp and wind vane data i : : -Temperature 14February 2011 Apparent icing event,February 2011,anemometer data -Speed34mA-Speed 34m6-Speed20m Wind Speed Anemometer data obtained from the met tower,from the perspectives of both mean wind speed and mean wind power density,indicate an excellent wind resource.Mean wind speeds are greater at higher elevations on the met tower,as one would expect,although perhaps more than expected.Note that cold temperatures contributed to a higher wind power density than standard conditions would indicate for the measured mean wind speeds. Anemometer data summary Speed34m Speed 34m Variable A B Speed 20m Measurement height (m)34 34 20 Mean wind speed (m/s)6.18 6.12 5.17 MMM wind speed (m/s)6.61 6.53 5.49 Max wind speed (m/s)27.7 27.1 24.7 on 4 Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Weibull k,annual Weibull c (m/s),annual Mean power density (W/m?) MMM power density (W/m?) Mean energy content (kWh/m?2/yr) MMM energy content (kWh/m?/yr) Energy pattern factor Frequency of calms (%)Y-hrautocorrelation coefficient Diurnal pattern strength Hour of peak wind speed MMM =mean of monthly mean,or annualized Time Series Time series calculations indicate high mean wind speeds during the winter months with more moderate mean wind speeds during summer months.This correlates well with the a typical Alaska village load profile where winter months have a high electric load and heat demand and summer months see a much lower demand for electricity and heat.The month-specific daily wind profiles indicate relatively even wind speeds throughout the day with slightly higher wind speeds during night hours. 34 n(A Qnemometer data summary 1.52 7.27 454 510 3,977 4,465 3.2 42.5 0.954 0.025 24 1.60 7.26 422 479 3,697 4,192 3.0 42.3 0.954 0.022 24 Std.Weibull Weibull Mean Max Gust Dev.k Cc Month _(m/s)(m/s)(m/s)(m/s)(-)(m/s) Jan 8.99 23.4 31.5 4.15 2.20 10.05 Feb 9.77 23.1 34.9 5.49 1.69 10.82 Mar 7.14 18.2 25.8 4.04 1.74 7.96 Apr 5.18 18.9 25.4 3.90 1.35 5.66 May 4.08 18.6 24.3 3.26 1.34 4.47 Jun 3.91 19.3 26.2 3.29 1.26 4.23 Jul 4.41 17.9 23.5 3.26 1.38 4.83 Aug 4.46 21.0 26.9 3.82 1.24 4.80 Sep 6.94 27.5 37.2 5.02 1.34 7.54 Oct 8.08 27.7 39.8 5.20 1.47 8.86 Nov 9.28 27.0 37.9 5.77 1.51 10.20 Dec 7.02 19.4 25.0 4.09 1.70 7.83 Annual 6.61 27.7 39.8 4.27 1.52 7.27 1.62 6.12 252 281 2,210 2,460 3.0 48.2 0.951 0.012 24 Page |7 oe iraeone¥V3 Enercy LLC }Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |8 Annual time series,mean and max wind speed 30 0 [-\me J \ens .Noame Max 34mA =Mean 34mA ome (lean 20 mWindSpeed,m/sa:)Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Daily wind profiles (per month) =Speed MamapodeApote]194 Fe 194 Mar 104 Aer =s yeeON!'Se0es 20moe-|8aN|E ::|_---- _ Probability Distribution Function The probability distribution function (PDF),or histogram,of the Kake met tower wind speed indicates a shape curve dominated by lower wind speeds,as opposed to a "normal”shape curve,known as theRayleighdistribution(Weibull k =2.0),which is defined as the standard wind distribution for wind power analysis.As one can see in the PDF of 34 m A anemometer,the most frequently occurring wind speeds are between 2 and 5 m/s with a few wind events exceeding 25 m/s (the cutout speed of most windturbines;see following wind speed statistical table).Note that the Weibull Valve is unusually low and?indicative,as one can see,of a site somewhat dominated by calm winds (defined as less than 4 m/s,the ° cut-in wind speed of most turbines)but periodically exposed to high winds. cm d Eagle River,Alaska 907.350.5047&V3 Enercy LLC Kake,Alaska Met Tower Wind Resource Report Page |9 PDF of34 mA anemometer (18 months'data) Py Probability Distibution Function,AN Sectors. i 19 speed 340A (mvt)20 23 F) =Actual date <=Best-fit Wobuilldstnbution(k=1.30,c=6.69 ms} Weibull k shape curve table 2 Occurrence by wind speed bin (34 m A anemometer) Bin Endpoints Occurrences Bin Endpoints Occurrences(m/s)(m/s) Lower Upper No.Percent Cumul.|Lower Upper No.Percent Cumul. 0 1 6,929 9.04 9.0 15 16 §=61,243 1.62 95.9 1 2 8,002 10.44 19.5 16 17 925 1.21 97.1 2 3 9,615 12.54 32.0 17 18 609 0.79 97.9 3 4 7,430 9.69 41.7 18 19 458 0.60 98.5 4 5S 5,864 7.65 49.4 19 20 407 0.53 99.0 5 6 5,364 7.00 56.4 20 21 282 0.37 99.4 6 7 =4,690 6.12 62.5 21 22 238 0.31 99.7 7 8 4,433 5.78 68.3 22 23 108 0.14 99.9 8 9 4,238 5.53 73.8 23 24 46 0.06 99.9 rT V3 Enercy LLCajEagleRiver,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report 9 10 3,963 5.17 10 11 93,641 4.75 11 12 2,825 3.69 12 13.2,281 2.98 13 14 =1,637 2.14 14 15 =1,370 1.79 Wind Shear and Roughness 79.0 83.7 87.4 90.4 92.5 94.3 24 25 26 27 28 29 25 26 27 28 29 30 19 10 0.04 0.03 0.01 0.01 0.00 0.00 Page |10 100.0 100.0 100.0 100.0 100.0 100.0 Awind shear power law exponent (a)of 0.328 indicates high wind shear at the site.Related to wind shear,a calculated surface roughness of 1.23 meters (indicating the height above ground level where wind velocity would be zero)indicates very rough terrain (roughness description:suburban)surrounding the met tower.These data clearly indicate that the location of the met tower near a relatively high forested hill immediately adjacent to the site substantially reduced wind speeds measured by the 20 meter anemometer.This resulted in a high wind shear and high roughness classifications.Undoubtedly, both indices are much lower at a more open site on Kupreanof Island,provided surrounding tree cover is minimal. Vertical wind shear profile +00 VerticalWindShosrProfie,Al Sectors HeightAboveGround(m)& a2 Comparative wind shear profiles 100: |z8HeightAboveGround(m&8-Mesuredgate=Poew ipa Mt one =6.328)>Log iow tt 120 1:23 my |2 V3 Enercy LLCEagleRiver,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |11 Extreme Winds A modified Gumbel distribution analysis,based on monthly maximum winds vice annual maximum winds,was used to predict extreme winds at the Kake met tower site.Eighteen months of data though are minimal at best and hence results should be viewed with caution.Nevertheless,with data available the predicted Vref (maximum ten-minute average wind speed)in a 50 year return period (in other words,predicted to occur once every 50 years)is 35.2 m/s.This result classifies the site as Class III by International Electrotechnical Commission 61400-1,3"edition (IEC3)criteria.IEC extreme wind probability classification is one criteria -with turbulence the other -that describes a site with respect to suitability for particular wind turbine models.Note that the IEC3 Class Ill extreme wind classification, which appears to apply to the Kake met tower site,is the lowest and most common classification.All wind turbines are designed to operate in IEC3 Class III sites. Site extreme wind probability table,34m A data Veet Gust IEC 61400-1,3rd ed. Period (years)(m/s)(m/s)Class Viet,m/s 3 27.6 37.5 I 50.0 10 30.9 41.9 T 42.5. 20 32.7 44.4 III 37.5 30 33.8 45.9 5 designer- SO 35.2 47.7 specified 100 37.0 50.3 average gust factor:1.36 Extreme wind graph,by return period 55.0 Kake Extreme Wind 50.0 _->w°o/=10-min max |an gust 30.0 0 10 20 30 40 50 60 70 80 90 100 Period,yearsWindSpeed,m/s&V3 Enercy LLCaeJ}Eagie River,Alaska 907.350.5047Pe. Kake,Alaska Met Tower Wind Resource Report Page |12 Temperature,Density,and Relative Humidity The Kake met tower site experiences warm summers and cool winters with resulting higher than standard air density.Calculated mean-of-monthly-mean (or annual)air density during the met tower test period exceeds the 1.180 kg/m*standard air density for a 390 meter elevation by 2.9 percent.This is advantageous in wind power operations as wind turbines produce more power at low temperatures (high air density)than at standard temperature and density. Temperature and density table Temperature Air Density Month Mean Min Max Mean Min Max Mean Min Max (°F)(°F)(°F)(°C)(°C)(°C)(kg/m?)(kg/m?)_(kg/m) Jan 29.1 6.4 40.2 -1.6 -14.2 4.6 1.242 1.214 1.302 Feb 26.3 8.1 40.5 -3.2 -13.3 4.7 1.249 1.213 1.297 Mar 31.3 8.5 52.9 -0.4 -13.1 11.6 1.236 1.184 1.296 Apr 37.3 27.6 52.8 2.9 -2.4 11.6 1.221 1.184 1.245 May 48.8 32.2 77.4 9.3 0.1 25.2 1.194 1.130 1.233 Jun 50.3 37.0 71.0 10.2 2.8 21.7 1.190 1.143 1.222 Jul 53.2 41.9 77.2 11.8 5.5 25.1 1.183 1.130 1.210 Aug 53.9 41.2 80.7 12.2 5.1 27.1 1.182 1.123 1.211 Sep 50.3 34.6 69.8 10.2 1.4 21.0 1.190 1.146 1.227 Oct 41.4 31.1 53.9 5.2 -0.5 12.2 1.211 1.181 1.236 Nov 34.5 20.9 52.7 1.4 -6.2 11.5 1.228 1.184 1.262 Dec 28.1 14.2 42.2 -2.2 -9.9 5.7 1.244 1.209 1.280 Annual 40.4 6.4 80.7 4.7 -14.2 27.1 1.214 1.123 1.302 Temperature graph 30.0 25.0 20.0 15.0 ¥v 10.0 -¢=Mean (°C) Ss ®5.0 l=Min (°C)CT) a °E 00 ee Max (°C) = -5.0 -10.0 -15.0 -20.0 1V3 Enercy LLC1_J Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |13 Air density DMap T |salt)Inthe 'air Density+ nog 2 eaoe18 le a . 122 ;.i i H 1 ;4 1.20 3 {tt F :j 118 ,a ; i 'g 14q.,}':o ':12iAM:i \7 4eHI1p7a af!|ye . 6 |I!|u D ,||4yooae|j Hh ny aboy|||a |oe . ' j : :\\h : 4 I '. Way aug t Sep Od Nov am -Jen Feb Mier Aor Hi 7 ia wt pry Sep oa Wind Speed Scatterplot The wind speed versus temperature scatterplot below indicates fairly warm temperatures at the Kake met tower site with most above freezing temperatures most of the time.During the met tower test periods,temperatures did not fall below,nor even approach,-20°C (-4°F),which is the minimum operating temperature for most standard-environment wind turbines.Note that the arctic-capable features (ratings to -40°C)of wind turbines in wide use in Alaska are not necessary in Kake and would be an unnecessary expense. Wind speed/temperature 0 BS 34 mA vs.Temperature,All Sectorswn Ppeed34mA(ns)™ei V3 Enercy LLC1EavleRiver,Alaska 907.350.5047ial Kake,Alaska Met Tower Wind Resource Report Page |14 Wind Direction Wind frequency rose data indicates that winds at the Kake met tower site highly directional,with southerly wind predominating.The mean value rose indicates that easterly winds,when they do occur, are of high energy and hence likely are storm winds.The wind energy rose indicates that for wind turbine operations,power-producing winds are dominated by southerly winds.Easterly power winds occur to a lesser degree and appear to be limited to late winter months.Calm frequency (the percent of time that winds at the 34 meter level are less than 4 m/s,a typical cut-in speed of larger wind turbines) was a relatively high 42 percent during the met tower test period (18 months of data). Wind frequency rose Mean value rose (34m A anem.) Wind Frequency Rose Meanof Speed34m AyearwOXcme°wueacd a >"mw ood m0 "no - a0 or swe a a oo =- ae rnd a =rey ur me =a a nd = Fd "=we baal , a we 7 mm we cd a 8 a aw =ne 2 mm oo Wind energy rose (34 mA anem.)Scatterplot rose of 34m A wind power density Total Wind Encrgy (34 0)ScattesplotofSpeod34aAWPD.=°-r "a cad a r = "yr m=or iw = oor badd er wo a cd a ow aw .-o a Aad ue a we eee i .we tawuw 1 mm»ae od At ad my a»wa20eo ne 1200 wow 1fairchad ww ""1V3 Enercy LLC nud Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |15 Wind density roses by month (common scale) dan Feb Mar Apvooewoloweaw»sy ”ser w wo oo 300 oor x00 eo sao oo 0 c sor zw ra me wn we m we 88%13%im hah 2a "30%'aor aur 8%12 20 |es wr ae we say Se gate Ts 58%"x20180°ae 10"ne 180°Po te"100°wor toot 1.May dun Jul AugeoQea»ow a ”a0 ”se » 300"eo »eo 300"eo soo oo me «a .so a0 ”a0"wr 18%;h.: 1S 13% 2 a 2 "wt -120 200°1 120°aw .hey OAM os uy B4%>Bsane150°awe 130 no wee ae ra10°to"{00 ve"Sep Oct Nov Dec o e e o30”0 w 330 o so Pa yor oo oor oo wor oo se eo zm so am 'o ne 2 me : o 18%18%1S fm .ne E.120 poy ;A.120 ze wor a ™we ux ue a om20130°ae 0 ae 10°wt we180°10 wot we Turbulence intensity (TI)at the Kake met tower site is higher than normally expected with an IEC 61400- 1,3 edition (IEC3)classification of turbulence category B at 34 meters.Note that the IEC3 classification of turbulence category S (special conditions)at 20 meters is very high.Terrain features to the east of the site -undoubtedly the moderately high forested hill near the tower-are inducing very high turbulence during periods of strong easterly winds.Interestingly though,the prevailing southerly winds also exhibit relatively high turbulence with at IEC3 category B classification,even though there are no obvious terrain obstructions in the direction of that sector.This is likely due to the general forest cover (albeit young growth conifers)in the area surrounding the met tower site. Turbulence synopsis 34m Aanem.20 m anem.Legend MeanTl Repres.MeanTl Repres. at 15 Tl at 15 IEC3 at 15 Tlat 15 IEC3 IEC3 Mean Tl at Sector m/s m/s Category m/s m/s Category |Categ.15 m/s all 0.126 0.160 B 0.174 0.220 S S >0.16 315°to 045°0.163 0.187 S undef.undef.undef.A 0.14-0.16 045°to 135°0.139 0.195 B 0.247 0.280 S B 0.12-0.14 135°to 225°0.123 0.150 B 0.166 0.200 S C 0-0.12 045°to 135°|undef.undef.undef.undef.undef.undef. Notes:undef.means no data records in 15 m/s bin in referenced sector Tl =turbulence intensity zz V3 ENercy LLC"J Eagle River,Alaska 907.330.5047a Kake,Alaska Met Tower Wind Resource Report Page |16 Turbulence at 34 meter level Turbulence intensity at the 34 meter level (top of the met tower)is shown in the graphics below. Turbulence intensity,34m A,all direction sectors 08 Turbulence Intensity at 34 m,All Sectors . =Representative TI =IEC Category A ==IEC Category B -=IEC CatagoryC 16 Wind Speed mys) Turbulence intensity,34m A,045°to 135°True ee insensityst34m,66°136"RepresentativeIECCategoryA\: ;-IEC Cotagory B Turbulence intensity,34m A,135°to 225°True ar.bntoresity at 34 m,136"-225" aey-4. O24 --ee4 ar |V3 Enercy LLC_J Eagle River,Alaska 907.350.5047ae Kake,Alaska Met Tower Wind Resource Report Turbulence at 20 meter level Turbulence intensity at the 20 meter level of the met tower is shown in the graphics below. Turbulence intensity,34m A,all direction sectors 07 Turbulence Intensity at 20 m,A Sectors, 1 1 =Representative Tl|-IEC Category A |==IEC Category 6 | -IEC Category C | 0.6}.-.-ne ee { ( 2 eaewF Pad !' 5 0 2 25 »15WindSpeed jrvs) Turbulence intensity,20 m,045°to 135°True °letenentyot20mi,46°-135° ert... Turbulence intensity,20 m,135°to 225°True .leneneityot29m,138-227 a EY EJ xYoudSpeedpeed Page |17 r YV3 Enercy LLC J Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page ]18 Turbulence table,34m A data,all sectors Bin Endpoints Lower Upper Records Representative (m/s)(m/s)in Bin Mean TI SD of TI Tl Peak TI 0.5 1.5 7,844 0.508 0.151 0.702 1.444 1.5 2.5 9,197 0.319 0.138 0.496 1.056 2.5 3.5 8,716 0.238 0.108 0.376 0.821 3.5 4.5 6,444 0.207 0.099 0.333 0.972 4.5 5.5 5,568 0.184 0.087 0.295 0.640 5.5 6.5 5,059 0.172 0.077 0.271 0.545 6.5 7.5 4,555 0.159 0.067 0.245 0.462 7.5 8.5 4,279 0.151 0.060 0.229 0.481 8.5 9.5 4,100 0.146 0.054 0.215 0.437 9.5 10.5 3,790 0.141 0.044 0.198 0.360 10.5 11.5 3,243 0.135 0.038 0.183 0.342 11.5 12.5 2,633 0.136 0.035 0.181 0.392 12.5 13.5 1,889 0.133 0.031 0.173 0.302 13.5 14.5 1,517 0.130 0.029 0.168 0.341 14.5 15.5 1,225 0.126 0.027 0.160 0.298 15.5 16.5 1,153 0.127 0.025 0.159 0.253 16.5 17.5 759 0.129 0.028 0.165 0.254 17.5 18.5 513 0.128 0.025 0.159 0.233 18.5 19.5 436 0.129 0.026 0.163 0.249 19.5 20.5 319 0.133 0.026 0.167 0.233 20.5 21.5 272 0.132 0.023 0.161 0.213 21.5 22.5 171 0.137 0.024 0.168 0.219 22.5 23.5 76 0.128 0.019 0.153 0.199 23.5 24.5 34 0.133 0.021 0.160 0.196 24.5 25.5 26 0.126 0.017 0.148 0.163 25.5 26.5 8 0.125 0.015 0.144 0.144 26.5 27.5 12 0.129 0.014 0.147 0.152 27.5 28.5 3 0.128 0.028 0.164 0.156 |V3 Enercy LLCAEagleRiver,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |19 Wind Turbine Performance The selection of suitable wind turbines for a wind power project in Kake is beyond the scope of this report,but for initial planning purposes,predicted annual energy output and capacity factor for the 100 kW Northwind 100 B model (21 meter rotor,37 meter hub height)and 225 kW Aeronautica AW29-225(29 meter rotor,40 meter hub height)are presented below. Note that the Alaska Energy Authority considers 82 percent turbine availability (percent of time that the turbine is operational and available to produce power,irrespective of wind speed)as the default value for planning village power projects.Many wind turbines in rural Alaska operate with better than 82 percent availability,but for a number of reasons some operate with lower than 82 percent availability. For this turbine performance analysis,the power law exponent for shear calculation was assumed to be a more conservative 0.140,not the measured value of 0.328,which undoubtedly is too high.An artificially high power law exponent would result in turbine performance predictions biased high when extrapolated to hub heights higher than 34 meters. Wind turbine performance,100%availability Northwind 100/B/21 Aeronautica AW29-225 Hub Hub Height Mean Net Mean Net Net Height Mean Net Mean Net Net Wind Power Energy Capacity Wind Power Energy Factor Speed Output Output Factor Speed Output Output Capacity Month (m/s)(kW)(kWh/yr)(%)(m/s)(kw)(kWh/yr)(%) Jan 9.1 53.8 40,059 53.8 9.2 117.5 87,445 $2.2 Feb 9.9 58.0 38,975 58.0 10.0 127.9 85,934 56.8 Mar 7.2 39.3 29,238 39.3 7.3 84.7 63,029 37.7 Apr 5.2 21.8 15,669 21.8 5.3 45.5 32,765 20.2 May 4.1 13.0 9,642 13.0 4.2 25.9 19,233 11.5 Jun 4.0 12.6 9,066 12.6 4.0 25.6 18,397 11.4 Jul 4.5 15.5 11,505 15.5 4.5 31.3 23,254 13.9 Aug 4.5 16.1 11,952 16.1 4.6 33.1 24,646 14.7 Sep 7.0 34.4 24,803 34.4 7.1 74.2 $3,429 33.0 Oct 8.2 43.7 32,502 43.7 8.3 94.9 70,625 42.2 Nov 9.4 51.4 36,989 $1.4 9.5 112.6 81,071 50.0 Dec 7.1 37.1 27,574 37.1 7.2 79.3 58,972 35.2 Annual 6.7 33.1 287,974 33.1 6.8 71.0 618,800 31.6 Wind turbine performance,82%availability Northwind 100/B/21 Aeronautica AW29-225 Hub Hub Height Mean Net Mean Net Net Height Mean Net Mean Net Net Wind Power Energy Factor Wind Power Energy Factor Speed Output Output Capacity Speed Output Output Capacity Month (m/s)(kw)(kWh/yr)(%)(m/s)(kW)(kWh/yr)(%) Jan 9.1 44.1 32,848 44.1 9.2 96.4 71,705 42.8 teeing 1V3 Enercy LLC 5 J Eagle River,Alaska 907.350.5047 Kake,Alaska Met Tower Wind Resource Report Page |20 Feb 9.9 47.6 31,960 47.6 10.0 104.9 70,466 46.6 Mar 7.2 32.2 23,975 32.2 7.3 69.5 51,684 30.9 Apr 5.2 17.9 12,849 17.9 5.3 37.3 26,867 16.6 May 4.1 10.7 7,906 10.7 4.2 21.2 15,771 9.4 Jun 4.0 10.3 7,434 10.3 4.0 21.0 15,086 9.3 Jul 4.5 12.7 9,434 12.7 4.5 25.7 19,068 11.4 Aug 4.5 13.2 9,801 13.2 4.6 27.1 20,210 12.1 Sep 7.0 28.2 20,338 28.2 7.1 60.8 43,812 27.1 Oct 8.2 35.8 26,652 35.8 8.3 77.8 57,913 34.6 Nov 9.4 42.1 30,331 42.1 9.5 92.3 66,478 41.0 Dec 7.1 30.4 22,611 30.4 7.2 65.0 48,357 28.9 Annual 6.7 27.1 236,139 27.1 6.8 58.3 507,416 25.9 F1V3 Exercy LLCewdEagleRiver,Alaska 907.350.5047 =