Since the first law approved by real decrete in March 14, 1890, the development of the electric industry utility in Puerto Rico has been growing according to the increasing demand of electric service in the nation. We have five energetic central, one combined cycle, 26 gas turbines and 21 hydroelectric units, that supplies with 4,397MW to the affiliates. The gross energetic need is served using transmission lines of 230kV, 115kV, and 38kV sub-transmission lines. The fuel used is residual fuel number 6 (bunker #6), except for the gas turbines that use light distillate number 2.

Ninety-eight percent of the energy is produced based on petroleum's derivatives. Petroleum is a life limited resource, so we keep looking for alternatives ways of producing energy since 1915 that was the first attempt with Carite #1 Hydroelectric plant. We include in the history part, information about hydroelectric, gas, combined cycle, carbon, and nuclear plants; costs, investments capital and places where had been located. It is also presented a link to a timeline that summarizes important events in the history of the development of the electric industry since the discovery of regular oil used to make candle lights.