Energy Imbalance Market saves APS customers nearly $6 million

February 01, 2017

Information from APS news release

APS customers saved $5.98 million in the first three months of the company’s participation in the western Energy Imbalance Market (EIM).

APS joined the EIM, run by the California Independent System Operator, on Oct. 1. The EIM enables utilities in eight states to buy and sell energy more efficiently to meet customer demand.

“One of the main reasons we decided to participate in the Energy Imbalance Market was because of the potential for savings through the innovative and flexible new tools it provides,” said Tammy McLeod, Vice President of Resource Management for APS. “We are always looking for ways to save our customers money and, as anticipated, the EIM is providing us that opportunity.”

The EIM automatically finds the most efficient energy resources available if APS decides to buy or sell power in five-minute increments. Its real-time market capabilities help APS and other utilities respond quickly to variable renewable energy production, such as solar and wind, and and better incorporate renewable resources by automatically adjusting to intermittency.

Arizona Republic (Feb. 1, 2017): APS saved customers $6M in new power-trading arrangement

California ISO Report (Jan. 30, 2017): Western EIM Benefits Report – Fourth Quarter 2016

California ISO news release (Jan. 31, 2017): Western EIM produces significant savings despite low demand