In California, both wind and solar generation are about ten times less in the lowest months versus the top three months.
If California reaches the 80% mark for renewables there will be massive amounts of surplus generation during the summer months and would need 9.6 million megawatt-hours of energy storage. Achieving 100% would require 36.3 million.
California should reach on 50% of its electricity from clean sources by 2020 and could pass a bill to legally require 100% by 2045. In January, they voted to close a nuclear plant which is a carbon-free source that provides 24% of the electricity.
The amount and cost of the storage will go over $350+ billion because of the wide variation in solar and wind power generation.
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