1. US Energy Information Administration. EIA expects U. S. electricity generation from renewables to soon surpass nuclear and coal can be found under https://www.eia.gov/todayinenergy/detail.php?id=42655 2020.
2. CASIO Managing Oversupply can be found under http://www.caiso.com/informed/Pages/ManagingOversupply.aspx 2020.
3. I. Penn California invested heavily in solar power. Now there's so much that other states are sometimes paid to take it can be found under https://www.latimes.com/projects/la-fi-electricity-solar/ 2017.
4. Progress in Flow Battery Research and Development
5. K. Neelis California Will Replace Gas Power Plants With The World’ s Largest Battery System can be found under https://www.greenmatters.com/news/2018/11/15/Z20gzzh/california-to-replace-gas-plants-with-tesla-batteries 2018.