Among these energies, the potential for solar energy is the
highest. Expressed in terms of installable electrical power, Spain
has the potential for several terawatts (TW) of solar energy. Wind
power takes second place, with a potential estimated at approxi-
mately 340 W. The country's hydroelectric potential, estimated at
approximately 33 GW, is also very high, but the greater part of this
potential has already been developed. The remaining technologies
have a potential near 50 GW, the potential for wave and geother-
mal energy approximately 20 GW each [53].