1. Communication from the commission to the European parliament, the council, the European economic and social committee and the committee of the regions - stepping up Europe's 2030 climate ambition,2020
2. Flexible nordic energy systems summary report Flex4RES project summary;Skytte,2019
3. Harnessing flexibility from hot and cold: heat storage and hybrid systems can play a major role;Kiviluoma;IEEE Power Energy Mag,2017
4. International Energy Agency., Organisation for Economic Co-operation and Development. The power of transformation : wind, sun and the economics of flexible power systems. n.d.