1.   Several hydroelectric plants and petrochemical firms were also affected.

2.   Also, a year-long drought boosted demand for electricity from its coal and oil-fired power plants, while slashing capacity at hydroelectric plants.

3.   At best, the rains will keep the hydroelectric plants operating until June, when heavier rains are expected, he said.

4.   At best, the rains will keep hydroelectric plants operating until June, when heavier rains are expected, he said.

5.   Bonneville markets power from federal hydroelectric plants across the Pacific Northwest.

6.   Bonneville markets power from federal hydroelectric plants in the Pacific Northwest.

7.   A hydroelectric plant in Ust-Kamenogorsk, Kazakhstan run by AES.

8.   A lack of water in parts of Chile has begun to limit power supply from hydroelectric plants, analysts said.

9.   A year-long drought had slashed capacity at hydroelectric plants, forcing them to rely on more expensive oil and coal-fired plants and depressing profits.

10.   AES operates two hydroelectric plants and a gas- and oil-burning electricity plant in Argentina, Woodcock said.