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Page Content
Generation and Loads
Avista maintains a diversified portfolio of generation resources.
2010 Generation Resource Mix
Hydroelectric
Company-owned hydro 41%
Long-term contracts 8% |
49% |
| Natural Gas |
33%* |
| Coal |
9% |
| Biomass |
2% |
| Wind contract |
2% |
| Other contracts |
5% |
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*This includes the Lancaster Purchased Power Agreement that became part of the resource mix as of Jan. 1, 2010. |
Installed capacity, generation capability by primary energy source and Net Energy Output by primary energy source
| Project Name |
Present Generation Capability (MW) |
Nameplate Rating (Installed Capacity) (MW) |
Net energy output (MWh) |
Primary Energy Source |
Regulatory Regime* |
| Upper Falls |
10.2 |
10.0 |
52,000 |
Hydro |
WUTC and IPUC |
| Monroe Street |
15.0 |
14.8 |
104,000 |
Hydro |
WUTC and IPUC |
| Nine Mile** |
17.6 |
26.4 |
106,000 |
Hydro |
WUTC and IPUC |
| Post Falls |
18.0 |
14.8 |
84,000 |
Hydro |
WUTC and IPUC |
| Little Falls |
34.6 |
32.0 |
199,000 |
Hydro |
WUTC and IPUC |
| Long Lake |
83.3 |
70.0 |
487,000 |
Hydro |
WUTC and IPUC |
| Cabinet Gorge |
254.6 |
265.0 |
1,061,000 |
Hydro |
WUTC and IPUC |
| Noxon Rapids |
556.6 |
480.6 |
1,673,000 |
Hydro |
WUTC and IPUC |
| Total Hydro |
989.9 |
913.6 |
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| Kettle Falls GS |
50.0 |
50.7 |
184,000 |
Biomass (Wood Waste) |
WUTC and IPUC |
| Kettle Falls CT |
6.9 |
7.2 |
33,000 w/Boulder Park |
Natural Gas |
WUTC and IPUC |
| Boulder Park |
24.0 |
24.6 |
|
Natural Gas |
WUTC and IPUC |
| Coyote Springs 2 |
278.3 |
287.0 |
1,559,000 |
Natural Gas |
WUTC and IPUC |
| Northeast CT |
56.3 |
61.8 |
44,000 w/Rathdrum |
Natural Gas |
WUTC and IPUC |
| Rathdrum CT |
149.0 |
166.5 |
|
Natural Gas |
WUTC and IPUC |
| Colstrip Units 3 & 4 |
222.0 |
233.4 |
1,277,000 |
Coal (Mine Mouth) |
WUTC and IPUC |
| Total thermal |
786.5 |
831.2 |
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| Total Generation |
1,776.4 |
1,744.8 |
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* Even though projects are located in Idaho and Washington, neither the IPUC nor the WUTC exercises exclusive jurisdiction since none of our company-owned generation assets are currently assigned to a specific state where they are located. Generation assets are split with about 65 percent being attributed to Washington and about 35 percent to Idaho.
** We are in the process of upgrading units 1 and 2 at the Nine Mile Hydroelectric plant. With the upgrade, planned for completion in 2010, we anticipate a total additional 16 MW capability for this plant. |
Average generation efficiency of thermal plants by energy source
Thermal generation is approximately 40 percent of Avista's total generation capability. Each facility has a specific purpose in Avista's diversified generation portfolio - whether it is for economic or load demand efficiencies.
| Plant Name |
Energy Source |
Heat Rate (Btu/kWh) |
| Boulder Park |
Natural Gas |
9,025 |
| Colstrip |
Coal |
10,735 |
| Coyote Springs 2 |
Natural Gas |
6,880 |
| Coyote Springs 2 Duct Burner |
Natural Gas |
8,500 |
| Kettle Falls |
Biomass |
13,500 |
| Kettle Falls CT |
Natural Gas |
8,750 |
| Northeast |
Natural Gas |
12,825 |
| Rathdrum |
Natural Gas |
11,950 |
Average plant availability factor by energy source
| Colstrip* |
Coal |
68.30% |
| Coyote Springs 2 |
Natural Gas |
97.30% |
| Kettle Falls |
Biomass |
96.20% |
| Hydroelectric facilities |
Hydro |
92.39% |
| Rathdrum |
Natural Gas |
95.30% |
| Northeast CT ** |
Natural Gas |
44.60% |
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*Extended 2009 outage from March - November |
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** Peaker unit - used only in times of significant energy demand |
Total water discharge by quality and destination - thermal generation
|
Coyote Springs 2-Natural Gas |
|
Annual Water Use |
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Combustion turbine (CT) make up -- For cooling; it replenishes the evaporation and blow down in the cooling tower. |
398 million gallons |
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Evaporation pond -- This is the site storm water drainage off of the pavement and outside areas. The water is only pumped off site if there is more water in the flow than can be evaporated. It dries up in the summer. |
250,000 gallons |
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CT Blow down -- This is to remove the concentrated solids that result from the evaporation rate in the CT. |
87 million gallons |
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Waste -- This is the water that is collected from the drains inside of the plant buildings and includes the water going through the sample panels and various small bleeds for coolers, air compressor, accumulator blow down, loop seal overflow, along with any leaks we might have in valves or seals. |
92 million gallons |
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Boiler make up -- This is water that is made for the steam turbine use. |
3.9 million gallons |
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Kettle Falls-Biomass |
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Discharge Water |
23 million gallons |
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Make-up Water |
130 million gallons |
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Colstrip-Coal |
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Waste water, storm water |
Zero discharge plant. All water is captured and stored in facility storage ponds. |
Length of above and underground transmission by voltage
Electric
- 17,800 miles of distribution lines
- 660 miles of 230 kV transmission lines
- 1,500 miles of 115 kV transmission lines
- 500 miles of 500 kV transmission lines (11% ownership in Colstrip to Townsend, MT line)
Natural Gas
- 141 miles of natural gas distribution mains (74 miles in the North Division and 67 miles in the South Division).
- 7,000 miles of distribution lines (5,000 miles in the North Division and 2,000 miles in the South Division).
Avista does not own any interstate gas transportation pipelines, only contractual rights, and receives gas at over 60 points along interstate pipelines (over 40 points in the North Division and over 20 points in the South Division).
2009 Electric and Natural Gas Loads
- Electric Average Hourly Load (aMW) 1,082
- Peak Electric Native Load (aMW)
- Summer (retail) 1,522
- Winter (retail) 1,763
- Peak Natural Gas Day Demand (Dth) 291,613
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