Excluding hydropower makes no sense
When California embarked on its quest to reduce emissions of carbon dioxide and other greenhouse gases as a global model to stave off climate change, its first target was the state’s electric power industry.
A series of ever-tightening decrees required utilities to shift from coal, natural gas and other carbon-based sources to a “renewable portfolio,” eventually reaching 100% non-carbon sources by mid-century.
The acceptable alternatives were specified in law, dominated by windmills, solar panels and geothermal wells. But for purely political reasons, the list omitted two power sources that are both free of greenhouse gases and renewable: large hydroelectric dams and nuclear plants.