Engineered Systems, Oct. 2016, by Khalil Kairouz, Vincent Priolo, and Safaa Al Musawi.
http://www.esmagazine.com/articles/97962-four-ways-to-capture-the-benefits-of-thermal-storage

"In our world of growing concerns with global warming, utility companies across the world are making energy storage more cost effective for energy users. Initially, energy storage was developed to reduce the energy cost to the customer. However, there are many more issues which now benefit the utility companies, hence the rebate and incentive programs offered to get customers to implement energy storage."