This document discusses the history of energy technologies in Los Angeles from 1857 to 1957. It highlights how in the late 19th/early 20th century, the city utilized a variety of energy sources including human, animal, wind, solar, and early electric technologies powered by coal, gas and hydroelectric power. It then discusses how oil and gas became dominant in the early 20th century, and how nuclear power first provided electricity to the Los Angeles power grid in 1957. The document argues that choices between technologies are often marginal, and that both new and old technologies can coexist for a time.