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)
In essence, the online marketplace would not only increase use of renewable energy but also create a community of neighbors who could invest in renewable projects together. (kleinmanenergy.upenn.edu)
The exemption encourages use of renewable sources of energy over traditional carbon fuels. (politics.co.uk)