1. Renewables became the second-most prevalent U.S. electricity source in 2020. https://www.eia.gov/todayinenergy/detail.php?id=48896.
2. Large scale renewable energy integration: issues and solutions;Kumar;Energies,2019
3. Quadrennial Technology Review 2015. https://www.energy.gov/quadrennial-technology-review-2015.
4. Grid Integration Toolkit. https://greeningthegrid.org/Grid-Integration-Toolkit/gridintegration-homepage.
5. Dwyer M.. Electric vehicles and hybrids surpass 10% of U.S. light-duty vehicle sales. https://www.eia.gov/todayinenergy/detail.php?id=51218.