La Grande-1 generating station
| La Grande-1 generating station | |
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 Location of La Grande-1 generating station in Quebec
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| Official name | Centrale La Grande-1 |
| Country | Canada |
| Location | Baie-James, Quebec |
| Coordinates | 53°44′04″N 78°34′25″W / 53.73444°N 78.57361°WCoordinates: 53°44′04″N 78°34′25″W / 53.73444°N 78.57361°W |
| Status | Operational |
| Construction began | 1989 |
| Opening date | 1994-1995 |
| Construction cost | C$2.5 billion |
| Owner(s) | Hydro-Québec |
| Dam and spillways | |
| Type of dam | Barrage |
| Impounds | La Grande River |
| Height | 25 m (82 ft) |
| Length | 2,584 m (8,478 ft) |
| Dam volume | 1,070,000 m3 (38,000,000 cu ft) |
| Spillways | 1 |
| Spillway type | Parabolic |
| Spillway capacity | 16,280 m3/s (574,923 cu ft/s) |
| Reservoir | |
| Total capacity | 1,228 hm3 (4.34×1010 cu ft) |
| Active capacity | 98 hm3 (3.5×109 cu ft) |
| Surface area | 70 km2 (27 sq mi) |
| Maximum length | 75 km (47 mi) |
| Normal elevation | 32.0 m (105.0 ft) |
| Power station | |
| Type | Run-of-the-river |
| Hydraulic head | 27.5 m (90 ft) |
| Turbines | 12 × fixed-blade propeller-type turbines General Electric (8); GEC Alsthom (4) |
| Power generation | |
| Nameplate capacity | 1,436 MW |
| Capacity factor | 57% |
| Annual gross output | 7,500 GWh |
| Source: Société d'énergie de la Baie James 1996 | |
The La Grande-1 is a hydroelectric power station on the La Grande River that is part of Hydro-Québec's James Bay Project. The station can generate 1,436 MW and was commissioned in 1994–1995. A run of the river generating station, it is one of only two generating stations of the James Bay Project that use a reservoir without any major water-level fluctuations (the Laforge-2 generating station is the other). Thus, the amount of electricity generated by the station depends almost entirely on the water-flow of the river, which is largely controlled by upstream reservoirs and generating stations.
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