Opinions split on Senate Bill 4: Consumer protections versus consumer skepticism
Missouri Senate Bill 4, passed in 2025, restructured utility regulation in the state to address concerns about power bills and data center energy consumption. The bill mandates "large-load tariffs" for investor-owned utilities serving data centers, requiring long-term contracts and payments for grid strain. While proponents laud it as a strict consumer protection measure, critics argue it may not go far enough and could still burden existing customers with costs related to new power generation for data centers.
Missouri Senate Bill 4, enacted in 2025, aims to regulate utility consumption by data centers across the state, sparking debate between consumer protection advocates and skeptics. The bill mandates that investor-owned utilities like Ameren Missouri, Evergy Missouri, and Liberty Utilities establish "large-load tariffs" for data centers. These tariffs require data centers to commit to minimum 12-year contracts, pay for at least 80% of their estimated maximum consumption, and cover costs associated with importing energy if the Missouri grid cannot meet demand.
Proponents, including State Representative Jim Schulte, assert that SB 4 is the nation's strictest law of its kind, designed to ensure data centers pay their fair share and prevent rate hikes for residential customers. Rob Dixon, Ameren Missouri Vice President of Regulatory and Legislative Affairs, confirmed that data centers are already signing commitments under SB 4, thereby protecting other customers. However, critics, notably the Missouri Office of Public Counsel (OPC), argue that the bill's consumer protections are insufficient. The OPC contends that new generation projects, like solar facilities announced by Ameren in Stoddard and Audrain counties, are primarily driven by data center demand, and existing customers should not bear the costs for energy they don't need.
Renew Missouri CEO James Owen, a former OPC staff member, expressed skepticism regarding the bill's effectiveness in having data centers fully cover indirect grid impact costs. He also questioned the timing of the accelerated power generation expansion, suggesting it predominantly benefits data centers. The bill also restructures the Integrated Resource Plan process, allowing consumer protection agencies to provide input and litigate terms, and incentivizes natural gas turbine construction by permitting utilities to recover costs while projects are in progress.