HomeMy WebLinkAboutGVEA - EVA Creek Wind Turbine Purchase - 2013Eva Creek
Wind Project
Mike Wright
VP Transmission & Distribution
April 30, 2013
Project Timeline
•2002-2009 Installed Meteorological Towers
•2006-2009 Conducted Feasibility Assessment
•2009 Received IRS Approval for CREB’s
•2010 GVEA Board Gives Green Light
•2011 Signed Contract with REpower and BOP
Contractor, Michels Wind Energy
•September 2011 Began Construction
•October 2012 Completed Construction
•December 2012 Commissioning Complete
Costs – Eva Creek
•Capital Costs
–Capital Costs: $94 million (net of grants)
–State Renewable Energy Fund: $3.6 million
–State Grant: $10 million
–CREB Financing at 1.05%
•Operating Costs: $1,200,000/year
•Cost of energy: 8.7 cents/kWh
•Exclusive of:
•Regulation costs
•Potential Green Tag sales to the
voluntary market
REpower MM92 CCV WEC
•Installed 12 REpower CCV MM92 Turbines
2.05MW rated output @ 12.5 m/s (28 mph)
80 m (262 ft) Hub Height
92.5 m (303 ft) Rotor Diameter
45.2 m (148 ft) Blade Length
3.0 m/s Cut-in Speed (6.7 mph)
24.0 m/s Cut-out Speed (53.7 mph)
REpower MM92 Tower Base
Nacelle & Hub Arrival in Anchorage
Tower Arrival in Anchorage
REpower MM92 Blade Delivery
Balance of Plant Construction
•Selected Michels Wind Energy for BOP
–Brice, Inc. (Civil Construction)
–PDC Engineers (Civil Design)
–Golder Associates (Geo-Technical Design)
–Stantec Engineering (Electrical Design)
–Redi-Electric (Electrical Construction)
–GHEMM Company (Buildings)
–Fairbanks Sand & Gravel (Concrete)
Components Delivered to Site
Tower Erection
Completed Blade Assembly
Final Top Out
Blade Repairs
Total production for
December was 8,645,650
kWh from 10 commissioned
turbines.
54.43% CF
13.06 MW
Regulation Issues - GVEA’s System
•Cannot schedule non-firm energy
around wind (must be day-ahead
scheduling)
•Wind will reduce the availability of non -
firm energy
•Once a firm resource (coal, combined
cycle) is below a minimum output level,
it must remain off-line for period of time
•Start time and start-up costs
Ability to Regulate
•Historical GVEA generation
commitment
Spilled Wind (MWh)
•2 minute data superimposed on hourly run
•Doesn’t include spill due to ramp rate
Regulation Costs
Annual Savings and Regulating Costs
Load following Eva Creek
•NPEP
–Suggested fixed low load limit 23 MW (for GT)
–Lower loads possible based on the operator,
ambient temperature, NOx bias, and turbine
efficiency (wear)
–Discuss duration of time steam turbine
remains off after being shut down
•Healy 1 – install AGC controls to allow dispatch
to operate the plant in other than base-load
condition
North Pole LM6000
Low load near trip condition
-Pink- Gas Turbine MW load
-Green- Steam Turbine MW load
-Blue- HP Boiler feed water flow
-Light blue- HP steam pressure at the turbine control valve
-Red- HP steam temperature at the control valve