As part of both the UK's and all countries move from the power station model to a more distributed power production
and storage system for power management, large scale ESS / battery is happening now.
ROI's are at 15% and the whole operation once installed is run by National Grid with minimal if no involvement by clients.
Effectively Clients investments in ESS for Grid balancing and power are like a stock market investment at 15% year on year.
Battery life is 25 years.
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