1. Michael T, Pablo R, Harold A, Sonia A-Z (2020) Renewable power generation cost in 2019. International Renewable Energy Agency (IRENA), Abu Dhabi
2. Francis M (2021) Renewables became the second-most prevalent U.S. electricity source in 2020. https://www.eia.gov/todayinenergy/detail.php?id=48896
3. Javed MS, Ma T, Jurasz J, Amin MY (2020) Solar and wind power generation systems with pumped hydro storage: review and future perspectives. Renew Energy 148:176–192
4. Raturi AK (2019) Renewables 2019 global status report
5. BloombergNEF (2021) Energy transition investment hit $500 Billion in 2020—For First Time. https://about.bnef.com/blog/energy-transition-investment-hit-500-billion-in-2020-for-first-time/