The Federal Energy Regulatory Commission on Aug. 23 rejected Southern California Edison Company’s proposal to curtail electricity delivery for customers with energy storage devices before considering other retail and wholesale users, in order to maintain system reliability during periods of high demand. The commission said it would be unduly discriminatory to treat storage customers differently without providing an opportunity to have their devices studied to pay for system upgrades needed for charging access. The company reasoned that there is currently no process to treat these customers in the same way as others, but FERC said the explanation does not justify the revision. The commission asked the company to continue its ongoing internal process to develop a procedure to account for the charging demand of storage devices to avoid preferential treatment.