http://www.forbes.com/sites/peterdetwiler/2014/03/31/green-charge-networks-in-some-markets-cost-effective-energy-storage-is-already-here/
http://www.forbes.com/sites/peterdetwiler/2014/03/31/green-charge-networks-in-some-markets-cost-effective-energy-storage-is-already-here/