In 2009 geothermal energy provided (a)   and El Salvador with about 25 percent of their electricity

(a)   power is generated from falling water, and is a potentially clean source of energy, causing little pollution

(a)   which often need to store the water for the electric generators, usually seriously disturb the local environment, sometimes require the displacement of large numbers of people.

The 3 Gorges Dam is located in (a)  

(a)   refers to the process of creating electricity using the air flows that occur naturally in the earth’s atmosphere.

(a)   means wind turbines that are erected in large bodies of water, usually on the continental shelf.

Direct (a)   can be used to heat space and water.

A (a)   , is an electrical device that converts the energy of light directly into electricity

In 2019, (a)   produced the most solar cells in the world

(a)   is the only renewable energy source that can be converted into liquid biofuels such as ethanol and biodiesel.

(a)   conversion is the name given to the production of liquid and gaseous fuel from crop, animal, and human wastes; from garbage from cities; and from crops especially grown for energy production

(a)   energy comes from burning old trees or disposed wood.

Biofuels are a main source of energy for (a)  

A (a)   is used to help fish get across large dams through a long tube.