Goldman Sachs does something roughly similar with their air conditioning system (Create ice at night when it's cheap and plentiful, and then melt it during the

Goldman Sachs does something roughly similar with their air conditioning system (Create ice at night when it's cheap and plentiful, and then melt it during the day to keep their buildings cool) http://www.bloomberg.com/news/2014-08-01/goldman-s-icy-arbitrage-draws-interest-to-meet-epa-rule.html http://www.bloomberg.com/news/2014-08-01/goldman-s-icy-arbit... Australia, Portugal, and presumably other countries have systems that heat up Hot Water heaters at night when power is less expensive as well.