Entergy Says Amazon's $25B Mississippi Buildout Cuts Bills

Entergy Mississippi is telling regulators and the public that Amazon’s $25 billion data-center buildout in Madison County and Clinton is lowering residential power bills, not raising them, pushing directly against the ratepayer-backlash politics that have started to slow data-center siting in other states.

Why it matters

The utility’s argument, that a hyperscale customer’s fixed payments spread grid costs across a bigger base and fund upgrades other customers would otherwise pay for alone, is becoming the industry’s standard defense against local opposition. Entergy says its 2024 and 2025 large-load agreements are projected to save Mississippi customers more than $2 billion over 20 years, and that Amazon is funding its own grid connections. But a Synapse Energy Economics report prepared for Earthjustice found Entergy’s underlying contracts and cost allocations are shielded from public review under Mississippi’s 2024 Senate Bill 2001, which exempts the large-load agreements from the state’s open-records law and narrowed the Public Service Commission’s oversight role. That confidentiality is the same friction developers are hitting nationally, communities and regulators are asked to accept a power company’s savings math without seeing the contract behind it. For any developer weighing a site in a state now writing SB2001-style large-load statutes, the Mississippi fight is the test case for whether “trust us” survives a rate case.

The numbers

Amazon’s Mississippi investment includes an $11 billion expansion at the Madison County mega-site and a separate $1 billion Clinton project, part of a total the company puts at $25 billion and 800 announced jobs, according to Entergy’s own account. Entergy’s formula rate plan filing with the Mississippi PSC, Docket 2025-UN-112, filed February 27, 2026, is the filing underlying Synapse’s finding that residential customers had paid roughly $38 million as of March 2026 toward data-center-related grid costs, on track for $74 million by year end, equivalent to about $10.60 a month per average customer according to the report’s estimate.

What’s next

The Public Service Commission’s reduced oversight under SB2001 means the dispute over whether Amazon’s contracts truly offset residential costs is unlikely to get resolved through a public docket hearing. Watch Entergy’s next formula rate plan filing, due in 2027, for whether the company discloses more of the underlying cost allocation, and watch other states’ legislatures for whether they copy Mississippi’s confidentiality carve-out as they compete for the same hyperscale investment tracked on our national market page.