The second reason for grid storage is the increasing use of renewable energy sources like wind and solar which are intermittent and not on - demand. (theness.com)
Large - scale use of renewable energy in the transport sector should be based on life - cycle analysis of its costs and benefits. (iea.org)
Developing countries have been among the leaders in research and development of renewable energy projects in recent years, although some face legal and regulatory hurdles. (powermag.com)