| Maoergai Dam | |
| Location Map: | China |
| Coordinates: | 32.0731°N 103.229°W |
| Country: | China |
| Location: | Mao County, Ngawa Prefecture, Sichuan |
| Purpose: | P |
| Status: | O |
| Construction Began: | 2006 |
| Dam Type: | Embankment, rock-fill |
| Dam Crosses: | Heishui River |
| Dam Height: | 147m (482feet) |
| Dam Elevation Crest: | 2138m (7,014feet) |
| Dam Width Crest: | 12m (39feet) |
| Res Capacity Total: | 535000000m2 |
| Plant Name: | Maoergai Hydropower Station |
| Plant Coordinates: | 31.9819°N 103.3355°W |
| Plant Commission: | 2011 |
| Plant Type: | Conventional |
| Plant Turbines: | 3 x 140 MW Francis-type |
| Plant Hydraulic Head: | 168m (551feet) |
| Plant Capacity: | 420 MW |
The Maoergai Dam is a rock-filled embankment dam on the Heishui River in Mao County of Sichuan Province, China. The primary purpose of the dam is hydroelectric power production and it supports a 420 MW power station. Preliminary construction (roads, bridges and foundation) for the dam began in 2006 while construction on the dam and power station commenced in 2008. The generators were commissioned in 2011.[1] To produce power, water from the reservoir is diverted to a power station downstream through a 16.15km (10.04miles) long headrace tunnel and penstock. The difference in elevation between the reservoir and power station affords a hydraulic head (water drop) of 168m (551feet). The dam sits just below the headwaters of the Heishui and water discharged through its power station regulates the flow of water for smaller power stations downstream.[2] [3]