The Missouri Public Service Commission approved Ameren Missouri’s rates for data centers and other large electricity users on Monday.

The commission voted unanimously to accept Ameren’s tariff proposal for customers using 75MW or more of electricity per month, which is more than double the usage of the largest customer in Ameren’s service area in 2024. The proposal was supported by the Sierra Club, Renew Missouri, staff of the Public Service Commission, Google and Amazon. The Office of Public Counsel, which advocates for customers of investor-owned monopoly utilities in Missouri, did not support the agreement but did not object.

The state legislature passed a law this year, SB4, that prompted utilities to create tariffs for large load customers like data centers. The law required t

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