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The Union of Concerned Scientists finds that California's current electricity sector planning is insufficient to replace the zero-emissions energy from the Diablo Canyon nuclear power plant, which is scheduled for retirement in 2024 and 2025. Without further action, the state faces a cumulative increase of 15.5 million metric tons of global warming emissions over the next decade, as existing natural gas plants fill the gap. The report recommends adopting a more ambitious 30 MMT emissions target by 2030 to guarantee full replacement and accelerate decarbonization.