Dan Johnson's blog

What's the Dirtiest Time of Day to Use Electricity?

Are there "dirty" hours when the California electric grid is producing a lot of CO2 per kWh, and "clean" hours with low CO2 output? It seems that midday should have lower CO2/kWh compared to other hours, if a large fraction of power across the state is generated by solar photovoltaics (PV) during these hours. Looking at data, Beyond Efficiency did in fact find a midday reduction in CO2 emissions per kWh generated for 2014 onward.

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