Public Service Commission approves prudence finding for $47 million substation amid concerns over limited oversight
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Summary
The Mississippi Public Service Commission approved a proposed order finding $47 million in costs for the Cosmo/Kosmos substation prudently incurred, while commissioners warned the Legislature's carve-out limits the agency's ability to review large-customer infrastructure and raised transparency and ratepayer-protection concerns.
The Public Service Commission on its March docket approved a proposed order finding that $47,000,000 in costs for phase two of the Cosmo (referred to in filings as Kosmos) substation were prudently incurred.
Miss Taylor, the commission staff presenter, told commissioners the review is narrow: "it's a very narrow ruling. It's it can't we're mandated to find that the costs are prudent unless a serious doubt is raised with respect to specific costs." She said staff and Bates White reviewed Entergy Mississippi's filing and concluded planning, design and cost of the project were prudent.
Chair offered extended context about the limits of the statutory framework in which the commission operates, saying the statute "divest[s] the commission of its authority to determine the present and future public convenience and necessity of these projects" and noting the commission's role is restricted largely to a prudence determination rather than front-end project approval. Chair said this degree of separation from the standard review process raises transparency concerns for commissioners and the public.
Commissioners asked who would bear costs associated with the project. An Entergy representative and staff explained that the revenues from a large customer have offset what otherwise would have been a $36 million rate action and that those revenues are in an early ramp period; staff said Bates White verified the cost numbers. Commissioner Carr and others pressed for clarity that the commission's vote was on prudence of recorded costs, not on project approval or rate-recovery mechanisms.
After questions and discussion, the commission voted to approve the proposed order finding the recorded costs (as of Oct. 31, 2025) prudently incurred and noted that any project costs in excess of $47,000,000 would be subject to further prudence review.
The vote concluded the item; commissioners said staff and utilities will follow up as needed and related implementation orders or rate proceedings occur through the commission's separate processes.
The commission adjourned after completing the agenda.