Solar power in Israel refers to the use of solar energy in Israel, which began in the early days of the state. In the 1950s, Levi Yissar developed a solar water heater to address the energy shortages that plagued the new country. By 1967 around one in twenty households heated its water with the sun and 50,000 solar heaters had been sold. With the 1970s oil crisis, Harry Zvi Tabor, the father of Israel's solar industry, developed the prototype of the solar water heater now used in over 90% of Israeli homes. Israeli engineers have been at the cutting edge of solar energy technology and its solar companies work on projects around the world. However, even though Israeli engineers have been involved in both photovoltaic and concentrated solar power, the Israeli companies which have become market leaders in their respective fields have all been involved in concentrated solar power. Some notable examples of this are BrightSource, Solel and Brenmiller Energy which all deal with utility scale projects.