Duke Energy Renewables is increasing savings for commercial solar customers through an alliance with Green Charge Networks, the country’s largest provider of commercial energy storage for retail, industrial and government customers.

The agreement provides these customers with “solar firming,” a way to smooth the peaks and valleys of a variable energy source. It also saves customers money by offsetting the higher prices of peak demand power.

Green Charge Networks, based in Santa Clara, Calif., will work closely with solar provider REC Solar to market energy storage systems with REC’s solar projects. Initial focus will be on the Southern California and Hawaiian markets.