Ameren Missouri revealed a proposal to construct a 2.1-gigawatt natural gas power plant in St. Charles County. The utility did not disclose estimated costs in its announcement, though industry precedent suggests substantial expenses. A comparable gas turbine project in South Carolina experienced cost escalation from $2.5 billion to $5 billion, illustrating price pressures in the sector. Meanwhile, a competing energy infrastructure development in Arkansas combining solar and battery storage components—totaling 1.6 gigawatts and 1.9 gigawatts respectively—carries an estimated cost of $3.5 billion without state-level financial support, demonstrating price parity with Ameren’s proposed gas facility while delivering equivalent grid services.
Ameren Missouri is expected to request authorization for Construction Work In Progress (CWIP) financing through the state Public Service Commission, a mechanism established by Senate Bill 4. CWIP approval would permit the utility to incorporate construction expenses into customer billing prior to the facility becoming operational, effectively requiring ratepayers to finance the project years in advance of electricity generation. Research indicates such arrangements typically increase overall project costs, with expenses outpacing the interest-rate savings utilities cite as justification. The proportion of project costs allocated to data center customers—a significant constituency within Ameren’s service territory—remains unspecified.
Opposition to the proposal emerged from environmental advocates. A representative from the Sierra Club’s Beyond Coal Campaign contended that solar and battery storage technologies offer cost-competitive alternatives to new gas infrastructure while presenting environmental advantages. The statement emphasized that natural gas sourcing requires out-of-state extraction and transportation infrastructure, exposing the region to price volatility during severe weather events and global supply disruptions. The critic also raised concerns regarding the CWIP mechanism itself, asserting that independent analysis contradicts utility claims of cost savings and that advance payment requirements present hardship during periods of economic strain and concurrent rate adjustment proceedings.
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