2
Electric Water Heaters Are Better at Storing Energy Than a Tesla Powerwall
(www.popularmechanics.com)
Everything about energy production and storage.
Related communities:
They seem to just be looking at hot water production alone for typical home uses. By heating (or even overheating) that water when renewable supplies are abundant using smart controls for time of use plans, it offsets more energy production for far less money than batteries would cost.