1. IRENA: Global renewables outlook,2020
2. ENTSO: Research, Development Innovation Roadmap 2020–2030. [Online] Available: http://www.entsoe.eu [Accessed on 12 September 2020].
3. CAISO: Impacts of renewable energy on grid operations,2017
4. Using battery energy storage to reduce renewable resource curtailment;Root,2017
5. IEA: Status of Power System Transformation 2019, IEA, Paris https://www.iea.org/reports/status-of-power-system-transformation-2019.