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Home My WebLink AboutCity of Atka Excess Hydro Energy Business Plan - Feb 2013- REF Grant 7030001City of Atka, Electric Utility Business Plan Dispatchable Energy Project Introduction The City of Atka, Alaska is located 800 miles Southwest of Anchorage on the Aleutian Chain. Atka is incorporated as a second-class city within an unorganized borough. The current population is 59 year round residents, and a large seasonal population associated with the Atka Pride Seafood's plant in Atka. The current population of Atka is anticipated to grow. The existing Atka Pride Seafood's plant is in the planning stages of a major upgrade to add crab processing. This project will include the addition of a 80 person housing complex for workers. Recently the City of Atka constructed a new 300 kW hydroelectric power plant on Chuniisax Creek. The new hydroelectric power plant provides electric power to the existing distribution system and work in conjunction with the existing diesel power plant. The capacity of the new hydroelectric power plant is in excess of the current community electrical demand. The City of Atka is responsible for operation and maintenance of the electric utility. Project This project consists of installation of a Dispatchable Electric Energy system to supply electric space heat to public buildings in Atka including the Clinic/City Office; Community Rec Hall; Tribal Office; Post Office; City Shop; and Fire Station. Each building installation will include replacing existing single electric meters with duplex meter bases; new dispatchable electric energy panel and controller; electric boiler, unit heaters, or baseboard; associated wiring and hydronic heating connections; and reprogramming existing hydroelectric plant controls. With an average rainfall year in Atka, it is estimated that the new hydroelectric plant can produce 1,677,471 kWh's. With an average community electric demand of 107 kW, 939,320 kWh's would be generated to supply the community. Based on average air temperatures, it is estimated that up to 307,025 kWh's of excess capacity would be available at the hydroelectric plant to offset space heat at the public buildings. This is equivalent to 4,152 gallons of heating fuel displaced. When the excess water is available in Chuniisax Creek, and excess capacity is available at the hydroelectric plant, the dispatchable controller in the switchgear will energize dispatchable energy panels in the public buildings. The electrical heaters in the public buildings will be controlled by the building thermostats. Existing space heat supplied by heating oil will be offset by the dispatchable energy system. Existing Infrastructure The City of Atka electrical utility generation system consists of a diesel electric power plant with two diesel fired 110 kW generators and one 37 kW generator, and an existing hydroelectric plant has a cross -flow turbine with a 300 kW generator. All generation is 480v Delta, three phase. Both plants have step up transformers to 7.2/12.47 kV Wye distribution voltage. The distribution system consists of underground single-phase and three phase jacketed concentric neutral. Transformers are located around the community to provide service City of Atka, Electric Utility Business Plan Dispatchable Energy Project voltage power to customers including 43 homes and 16 public and commercial facilities. A major portion of the distribution system was upgraded in 2012. The electric utility reads meters on a monthly basis for total kilowatt hours (kWh) and utility customers pay for kWh's consumed at the tariff rate. Utility Organization The City administration consists of a city administrator and admin staff, electric plant and water plant operators, and maintenance personnel. The public works department operates and maintains the electric utility and reads meters. The city administrator and staff handle billing and collection of fees. The city council oversees the city administrator and sets policy and approves budgets. This project will require amendment of the existing electric utility tariff to provide for a kWh cost for dispatchable electrical energy. Project Construction and Maintenance Costs Construction of the proposed dispatchable energy project is estimated to cost $123,390. Project life is estimated as 20 years. With a 5% interest rate and 20 year life the annual cost of a loan for construction would be $9,901.13 per year. After construction the operation and maintenance of equipment and system will be transferred to the owners of the public buildings. The annual maintenance cost of the installed system will increase the annual utility operational costs nominally as six additional electric meters have to be read, and additional bookkeeping required to invoice and collect fees. The additional annual labor cost is estimated at $500. Total annualized estimated cost for the project is $10,401.13. With an estimated annual supply of 307,000 kWh, the break even cost for dispatchable energy would be $0.04 per kWh. The annual maintenance cost to the individual building owners is estimated to be less than $100 per year in set aside funding for future replacement of meter bases, controller, and electric heating units. The supplied kWh of dispatchable energy is equivalent to 9,304 gallons of heating oil. With an estimated usage of 50% it is estimated that 4,152 gallons of heating oil would be displaced annually. With the current cost of $6.00 per gallon the cost of the displace fuel would be $24,912 per year. The energy cost for dispatchable energy would need to be set by the City Council, but for this analysis, assuming an energy cost of $0.05 per kWh the cost of dispatchable energy would be $15,350 for an annual savings of $9,562. Appendix Project Construction Estimate Chuniisax Stream flow, Dispatchable energy estimate Dispatchable Heat Poiarconsult Alaska, Inc. 2/14/2013 Atka, Alaska Engincers Estimate Contract Labor Shr days Labors M-Hrs Mob 2 3 48 Expediter 4 1 32 Plumber 6 1 54 Electrician 14 1 126 Electrician App 14 1 126 De mobe 1 3 24 Labor Hours 410 Labor Total $ 90.00 per hour $ 36,900 Equipment Days Rate Eq Total Pickup 20 22 $ 200.00 $ 4,400 Misc Sm Tools 22 $ 50.00 $ 1,100 Equipment Total $ 5,500 Materials units Rate Eq Total Duplex Meterbases 6 ea $1,000.00 $ 6,000 TTG 51 Installations 6 ea $ 400.00 $ 2,400 Disp Heat Panels 6 ea $ 250.00 $ 1,500 Electric Boilers 2 Is $2,500.00 $ 5,000 Unit Heaters 4 ea $ 900.00 $ 3,600 Baseboard 76 ft $ 35.00 $ 2,660 Wire & Conduit 1 Is $ 3,000.00 $ 3,000 Copper pipe, valves, ftgs 1 Is $ 3,000.00 $ 3,000 Freight I is $4,000.00 $ 4,000 Materials Total $ 31,160 Travel & Perdiem Total RT Airfare PerDiem Housing 3 $1,568.00 $ 36 $75.00 $ 36 $100.00 $ 4,704 2,700 3,600 Travel & Perdiem Total $ 11,004 Const Contingencies Contractor OH & Profit I5% $ 1205 22% $ 21,395 Estimated Construction Cost $ 118,644 Inspection Admin. 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