HomeMy WebLinkAbout409035 Soldotna to Nikiski Transmission Upgrades 2011adSoldotna to Nikiski 69 kV to 115 kV Transmission Line Upgrade
Introduction
The Alaska Electric &Energy Cooperative (AEEC)through ARCTEC has been awarded funds to build a 115
kV line between the Soldotna -Tesoro -Bernice and Nikiski substations.
This project will complete a Kenai Peninsula industrial area 115kV transmission loop from the Soldotna
substation to serve Tesoro,Bernice,and Nikiski substations.This will make Nikiski and Bernice
generation more reliable by eliminating the existing single contingency failure of the radial 115kV
transmission line from Soldotna-Tesoro-Bernice-Nikiski;and it will prevent the reduction of Bradley
power flow to Anchorage due to stability limitations imposed by running other generation.The majority
of this transmission path will be created by converting existing 69kV lines and substations to 115kV.
Scope of Work
Implementation
A 115kV loop will be created by constructing a new 115kV line from the Nikiski substation to a new
115kV breaker position in the Soldotna substation.To greatly minimize new easements and right of way
(ROW)needs and cost,the new line will use the majority of the existing 69kV line ROW from Soldotna,
through the Beaver Creek and Marathon subs,to a point just before the Tesoro refinery site where it will
intercept the new line out of Nikiski (refer to the North End Transmission Diagram,Appendix A).To
keep all loop line segments the same capacity,the new line will use 556 conductor which will require
replacement of the 69kV 4/0 line and structures.This work will also require upgrading the 69kV
distribution substations to 115kV (Marathon,Beaver Creek,and Soldotna distribution),and upgrading a
short section of 115kV line from 4/0 to 556.This conversion must be done in stages to keep the City of
Kenai and surrounding areas energized.This area is presently fed from the existing 69kV system.
The overall work will be a design-bid-build process.It is intended that both the line and substation
designs will be issued to a single company.Individual construction steps below shall be either by
contract,HEA labor,or a combination thereof.,
Steps of the planned construction are listed below starting at the Nikiski end of the system.The
numbers are as noted on the attached North End Transmission Diagram.
1.Nikiski Substation-The majority of work at the Nikiski substation necessary for the 69 to 115 kV
conversion is already being performed by AEEC/HEA and will be completed this fall.It will include a
breaker position and steel tower for the new line.The remaining work to be covered by the grant
award will be adding the requisite relaying for this line position to match the new design,and an
upgrade of the existing 4/0 to 556 conductors on the Bernice to Nikiski line segment.
2.Nikiski to South of Tesoro Line Segment -This line segment will meet up with the existing 69kV
ROW to the south and east of 69kV switch 29001,a distance of about 2 miles.It is a new line
segment with no existing easements or ROW.Since this ROW represents the largest unknown at
this point,the first focus of the project will be getting a preliminary design contract out to finalize
the route and obtain easements.This line will connect to Nikiski position NB4.Also,a short section
of unused line to the old BP substation will need to be removed to make way for the new line.
10.
a
a '
Tesoro 69kV tap and $W29001 -As the 69kV line will no longer exist south of sw49001,this switch @
will be removed and the existing tap to the 69kV Tesoro sub will become the endpoint of the 69kV '
line from Bernice Lake.The Tesoro 69kV sub will then be a radial feed from Bernice,but with
eventual project completion,the Tesoro 115kV sub will be part of the new transmission loop.
Tesoro area to Ivanoff Junction Line-The existing 69kV ROW will be used to rebuild the entire line
to 115kV using 556 conductor,a distance of about 7.1 miles.
Ivanoff to Marathon and Marathon to Beaver Creek Lines-Past construction built these lines for
115kV using 556 conductors,therefore no monies from the grant award are needed for this line
segment.
Marathon Substation -This substation will be changed to receive two incoming lines and
corresponding breaker positions.The sub was built using a transformer capable of using either 69kV
or 115kV on the high side,so it will be ready to switch to 115kV once the incoming lines are
energized.
Beaver Creek Substation and 69kV 3-way SW29006/7/8 -This sub will need a new 115kV
transformer.Preliminary reviews show that the high side bus and circuit switcher may not need
rework,but the 69kV $W29006/7/8 will need to be replaced with a 115kV 3-way switch and a new
supporting structure.
Beaver Creek to Soldotna Line -The existing 69kV ROW will be used to rebuild the entire line to
115kV using 556 conductors,a distance about 7.3 miles.The line will land on a new 115kV breaker
position in the Soldotna substation.
Soldotna 115kV Yard -A new 115kV position including breakers,steel,switches,and controls will
be needed to expand the breaker and a half scheme to accommodate the new 115kV line.Several
new large towers will also be required within the existing ROW for the new line to avoid
interference with existing lines and structures.
Soldotna 69kV Yard and Distribution Substation -The entire 69kV yard will be removed including
the existing distribution transformer,the 115/69kV autotransformer and the terminus of the
Soldotna to Quartz Creek 69kV line from.A new 115kV distribution transformer will be
required,and will be fed from the 115kV breakers that currently connect to the autotransformer.
Reports and Requests for Reimbursement
Progress reports and requests for reimbursement will typically be made quarterly during the grant
duration.
Cost Estimate
The attached spreadsheet shows the estimated costs broken down by the above steps.These scope
level estimates are by general work items and include material,labor,contract support,etc.New
transmission line costs are estimated at $750,000 per mile based on historic construction costs plus any
unique costs.Transmission line segments that have existing ROW are estimated at $600,000 per mile
based on historic construction costs plus any unique costs.Removal costs are estimated at $50,000 per
mile.Substation construction costs are estimated based on recent equipment purchases and
2
construction costs.More refined estimates will be possible once bids have been received for
construction.
The majority of work at the Nikiski sub necessary for this conversion is already being performed by
AEEC/HEA in 2011 thus reducing the estimate significantly.In addition,various site upgrades that
would be opportune to perform while working these sites have not been included to keep the estimate
closer to the $18M grant cap.
Item Description Amount
1 --sCNikiski Sub &Line Reconductor $280,000
2.Nikiski South Line $1,780,000
3.Tesoro 69kV Tap $60,000
4 _Tesoro to Ivanoff Line $4,625,000
5 _Existing 556 115kV Line so
6 Marathon Substation $355,000
7 'Beaver Cr Sub &3-way Switch $1,990,000
8 Beaver Cr to Soldotna Line $4,795,000
9 =Soldotna 115kV Substation $1,725,000
10 Soldotna 69kV Substation $2,945,000
Subtotal |$18,555,000
Total +10%Contingency |$20,410,500
Milestones
Steps 1,2,and 9 can be started immediately.The remaining items must be staged to keep the City of
Kenai area energized.The majority of construction will be done in 2012,but final completion and tie in
will extend into 2013.An attempt has been made to consider material lead times in the below
milestones.However,until design details are completed and actual lead times are confirmed at the
time of order,material lead times may significantly impact the below milestones.Final scheduling will
depend on details worked out once a design contract has been issued and when easements/ROW
acquisition is completed and required permits obtained.
Rather than interlace all the milestones into a single listing,they have been broken down by the
individual steps where appropriate.
Deliverables
Deliverables for all milestones will be copies of design,permits,construction and other reports,photo
documentation,and additional information requested by AEA.
Overall 8/13/2011 -4/15/2013
2011-August 13;Completed and Authorized Grant.Commence work on design RFP.
2011-September 15;Issue RFP for design of all line segments and substation work.
2011-October 30;Issue Design Purchase Order and commence design work.
2012-May 15;Commence Bernice 69kV outage for steps 3 and 4.Kenai fed only from B.Creek and
radial Soldotna 69kV line.
2012-October 31;With steps 1 thru 6 complete,energize Marathon at 115kV.De-energize all Soldotna
69kV yard,69kV line and Beaver Creek.Kenai being carried by Marathon and new Nikiski 115kV line.
2013-April 15;Beaver Creek sub back in service.Soldotna 25kV work starts.
2013-November 1;Soldotna distribution back online.Project complete.
Step #1 Nikiski Substation
2011-October 30;Complete NIK-BNT line reconductoring design.
2011-November 30;Issue PO for line reconductoring and commence work.
2012-April 1;Complete Nikiski sub relaying upgrades.
2012-May 1;Complete NIK-BNT line reconductoring
Step #2 New Nikiski Line
2011-October 30;Complete removal of old BP fine.
2011-November 11;Begin Easement/ROW acquisition and permitting as part of preliminary design.
2012-April 1;Order long lead time poles for line construction.
2012-June 1;Complete obtaining ROW,easements and permits.Issue new line design.
2012-June 15;Issue PO for clearing and grubbing of ROW.Issue RFP for line construction.
2012-July 15;Complete ROW clearing and grubbing.Issue line construction PO.
2012-October 31;Line construction complete to Nikiski (same as step #4).
Step #3 Tesoro tap and SW29001
2012-May 15;Shift Marathon &B.Creek to Soldotna 69kV line.Commence outage of 69kV from
Bernice (same as step #4).
2012-September 15;Complete removal of SW29001 and line to tie point (steps 2,3,4).Restore Bernice
69kvV line.
Step #4 Line-Tesoro to Ivanoff
2012-February 1;Issue PO for long lead poles.Obtain required permitting.
2012-March 1;Issue completed line design.Issue RFP for construction.
2012-May 15;Issue construction PO.Remove line from service and commence construction (same as
step #3).
2012-October 31;Tie in to lines in steps 2 and 5.Line construction complete to Nikiski (same as step
#2).
Step #6 Marathon Substation
2011-September 31;Complete foundation work and erect getaway steel and guys when it arrives.
2012-April 1;Complete termination of second line to new getaway.Issue PO for substation
construction to add breakers.
2012-July 31;Complete major substation construction and split incoming lines.Use 69kV for final
testing.
2012-August 15;Take Marathon offline and convert transformer &relaying to 115kV.
2012-October 31;With steps 1 thru 5 complete,energize Marathon at 115kV.
Step #7 Beaver Creek Substation and 3-way Switch
2012-January 20;Design far enough along to order 25kV transformer.
2012-March 20;Design far enough along to order 3-way switch.
2012-May 1;Design complete,issue construction RFPs.
2012-September 31;Issue construction PO and coordinate with transformer delivery and substation
outage.
2012-October 31;With steps 1 thru 6 complete,deenergize 69kV line from Soldotna.Marathon now
carries Kenai load.Commence 3-way switch and transformer replacement.
2013-April 15;Construction complete
Step #8 Beaver Creek to Soldotna Line
2012-August 1;Design complete,issue construction RFPs.
2012-October 31;As dictated by steps 1-6,outage to commence construction.
2013-April 15;Construction complete.When step #9 is completed,substation back online.
Step #9 Soldotna 115kV Substation
2012-March 20;Design far enough along to order long lead material.
2012-May 1;Design complete,issue construction RFPs.
2012-June 31;Construction starts for expansion of 115kV yard and line getaway.
2012-October 31;115kV yard line construction complete.
2013-April 15;Tie in to new 115kV line dictated by step 8 completion.
Step #10 Soldotna 69kV Substation
2012-July 1;Design complete,issue construction RFPs and order SOD 2SkV transformer.
2013-April 15;Dependent on Beaver Creek back online,with steps 1 thru 7 complete,de-energize 69kV
yard for final time.Commence Soldotna 25kV transformer changeout.
2013-November 1;Complete connection and integration of new 25kV transformer and re-energize
Soldotna distribution.
Key Personnel
The AEA project administrator will be Bryan Carey,or as designated by AEA.Key AEEC personnel are
shown below.
Grant Administrator:TBD
Project Coordinator:|Mark Peery 335-6207 mpeery@homerelectric.com
Finance Coordinator:Kim Marrale 398-7905 kmarrale@homerelectric.com
Mike Tracy 235-3329 mtracy@homerelectric.com
Appendix A -North End Transmission Diagram
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NIKISKI #2 NIKISKI #1
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40 MVA 38 MVA
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SS a |Siep#E MARATHON oKENAI]/ 7>>|STERLINGfey=Steps #9 &10fy:4 we,
DAP _=(FUTURE)
f OND ;a Xe -L,SOT to!Xe OLDOTNA f Q.Crk 69kVFUTURE)'
oe 1 *-et eeRUAIEEsveor”
James Strandberg
From:Tracy,Mike <MTracy@HomerElectric.com>
Sent:Friday,August 26,2011 8:34 AM
To:James Strandberg
Subject:RE:Soldotna to Nikiski Transmission Line
Attachments:AEA-Soldotna to Nikiski 69 to 115 kV upgrade prelim budget.xlsx
Jim,
Here you go,note that this is a preliminary budget.
From:James Strandberg [mailto:JStrandberg@aidea.org]
Sent:Wednesday,August 24,2011 5:22 PM
To:Tracy,Mike
Subject:Soldotna to Nikiski Transmission Line
Mike,
|got this draft scope of work from Butch,who got it from you.There are cost spreadsheets noted in the text of the
scope that are not a part of the file.Can you provide?_
Thanks,Jim
The Item numbers below match the description numbers in the related implementation plan.
Item Description Amount
1 Nikiski Sub &Line Reconductor $280,000
2 Line-Nikiski South $1,780,000
3 Tesoro 69kV Tap $60,000
4 ___Line-Tesoro to Ivanoff $4,625,000
5 Existing 556 115kv Line sO
6 Marathon Sub $355,000
7 =B.Creek Sub &3-way SW $1,990,000
8 Line-B.Creek to Soldotna $4,795,000
9 Soldotna 115kV Sub $1,725,000
10 Soldotna 69kV Sub $2,945,000
Subtotal]$18,555,000
|Total +10%Contingency]$20,410,500
BacktoOverall
Description Amount
NB3 Line to Bernice-4/0 to 556.$200,000
NB4 Relaying Upgrade to SEL 421 $15,000
Integration into Subnet RTU $5,000
Comm to Soldotna-equip for xfer trip $50,000
Startup testing $10,000
Total $280,000
Back to Overall
Description Amount
Remove present BP line from NB4 position $50,000
Nikiski tie in and Hwy crossing $80,000
ROW easements $100,000
Document incorporation into HEA accounting system $50,000
2 miles of new line construction $1,500,000
Total $1,780,000
Back to Overall
Description Amount
Remove 69kV SW29001 &Guy $45,000
Remove 500 yards of 69kV $15,000
Total $60,000
BacktoOverall
Description Amount
Remove old 69kV line $355,000
Document incorporation into HEA accounting system $10,000
7.1 miles of line in existing ROW $4,260,000
Total $4,625,000
Back to Overall
Description Amount
Engineering evaluation of Dist Xfrmr $5,000
Tie the second line into the sub $50,000
Convert high side to double line $300,000
Total $355,000
Back to Overall
Description Amount
115/24.9kV Transformer $1,200,000
Transformer install &integration $500,000
115kV 3-way switch &structure $130,000
3-way SW design &install $90,000
Startup Testing $70,000
Total $1,990,000
Back to Overall
Description Amount
115/24.9kV Transformer $1,200,000
Transformer install &integration $500,000
115kV 3-way switch &structure $130,000
3-way SW design &install $90,000
Startup Testing $70,000
Total]$1,990,000
Back to Overall
Description Amount
Remove old 69kV line $365,000
Document incorporation into HEA accounting system $50,000
7.3 miles of line in existing ROW $4,380,000
Total $4,795,000
Back to Overall
Description Amount
New breakers,switches,PTs,etc $450,000
Takeoff steel and line crossover towers $250,000
Substation design &protection integration $250,000
Installation $700,000
Startup testing $75,000
Total $1,725,000
Back to Overall
Description Amount
115/24.9kV Transformer $1,200,000
Transformer install &integration $500,000
Removal &disposal of 69kV yard equipment $300,000
Substation design &protection integration $250,000
Metering CTs/PTs &Installation $150,000
Autotransformer removal,storage site &move $450,000
Startup testing $95,000
Total $2,945,000