1 February 2018. Across the world, power downtime keeps going up. Power outages increased in frequency and were more widespread in 2016, affecting 33% more people. Among the top 15 US utilities, the most recently reported average downtime was more than two hours, with some outages averaging more than seven hours.

CLEAN TECHNICA

https://cleantechnica.com/2018/01/27/why-we-need-a-solar-storage-solution

At industryabout.com:

Energy

 

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