Clean energy powered 100 per cent of California's electricity demand on Saturday a first for the state, according to an environmental group. Much of the renewable power came from vast solar farms, south of Los Angeles. The milestone, set on 30 April, was celebrated by environmental groups. "California busts past 100% on this historic day for clean energy!" tweeted Dan Jacobson, co-founder of the activist thinktank EcoEquity. Daniel M Kammen, a professor of energy at UC Berkeley, also wrote: "California achieved 100% renewable energy today. Very clear we can achieve clean energy everyday before 2030 if we cut the fossil fuel subsidies and political inertia." According to the tracker app from the California Independent System Operator (CAISO), which oversees the state's power grid, energy demand reached 18,672 megawatts(MW) mid-afternoon on Saturday, with 37,172 MW available. The record was held for nearly 15 minutes, then dropped to 97 per cent of clean energy output. Solar power makes up the majority of California's renewables followed by wind energy then to a lesser extent, geothermal, biomass, biogas and small hydro. The state of California, the world's fifth largest economy, produces more renewable energy than any other US state, helped along by its near year-round sunshine. Governor Gavin Newsom's budget proposal for next year includes around $2bn to boost the transition to 100 per cent electricity. California has set a goal of achieving 100 per cent clean electricity by 2045.