The Customer Who Would Rather Not Be OneThin moat

Vistra (VST) — moat facet

They are contracting with Vistra because they cannot yet build what they need, and all of them are working on it.

The most important thing about Vistra's new customers is that they would prefer, all else equal, not to have a power supplier at all.

Meta's January 2026 nuclear contracts (GW)Total contracted that dayup to 6.6 GWTo unbuilt reactorsabout 4 GWWith Vistra, existing plants2.6 GWAs reported on the Constellation page; Vistra 10-Q Q2 2026 for the 2,609 MW
The buyer spent more of the day's commitments on reactors that do not exist than on plants that do: it is solving for supply, not choosing a supplier.

A data centre operator's ideal arrangement is generation it controls, sited where it wants, at a cost it can plan. Vistra's own risk disclosure names the trend: large-scale cryptocurrency mining and AI data centres, particularly in markets including ERCOT, are increasingly built behind-the-meter1 — connected directly to generation rather than drawing from the grid.

Meta demonstrated the preference at the same moment it became a customer. Of up to 6.6 gigawatts of nuclear contracted across three companies in January 2026, Vistra supplied the megawatts that already exist; the rest went to developers of reactors that do not2. A buyer willing to underwrite unbuilt nuclear is a buyer solving for supply rather than shopping for a supplier.

Vistra's answer is Helix Digital Infrastructure, a newly formed company developing infrastructure for AI-oriented hyperscalers, for which Vistra agreed to be the preferred power partner3. That is an attempt to be inside the arrangement rather than adjacent to it.

Rated thin, because the structural direction is unfavourable even though the current contracts are excellent. The hyperscalers are contracting with Vistra because they cannot yet build what they need, and every one of them is working on being able to.

The measure is the share of announced hyperscaler capacity that is grid-connected rather than self-supplied, and it has been moving the wrong way.

Moat trajectory: Narrowing

The share of announced hyperscaler capacity that is self-supplied rather than grid-connected keeps rising, and Meta's own January 2026 announcement put most of its megawatts with developers of reactors that do not exist.

The number that tests this moat
Moat Explorer calc
Existing nuclear capacity not yet under long-term contract
About 3,072 MW of 6,448 MW

Every megawatt contracted is a data centre that did not build its own power. This figure shrinking through new twenty-year deals is the evidence that large buyers still prefer Vistra's plants to their own.

How it's calculated: 6,448 MW of existing nuclear less 1,200 MW contracted to AWS (Comanche Peak) and 2,176 MW contracted to Meta (Perry 1,268 MW plus Davis-Besse 908 MW); Meta's 433 MW of uprates are new capacity and excluded.
Source: Vistra Form 10-K, FY2025; Vistra-Meta and Vistra-AWS agreements ↗
References
  1. ReportedVistra's own risk disclosure names the trend: large-scale cryptocurrency mining and AI data centres, particularly in markets including ERCOT, are increasingly built behind-the-meter — connected directly to generation rather...
    Vistra Corp. Form 10-K, FY2025, risk factors and business outlook — "If electricity demand does not grow at the rate expected, or if we are unable to execute on large load offtake opportunities, including under long-term power purchase or offtake agreements that we have entered into, our financial performance, growth opportunities, and stock price could be adversely impacted"; "Multiple demand drivers such as emergence of large load data centers, including in response to transformations in technologies like artificial intelligence (AI) and electrification of oil field operations (specifically in the Permian Basin of west Texas), have accelerated, and are expected to continue to accelerate, load growth in the geographic regions we serve"; "large-scale cryptocurrency mining, AI data centers, and increased industrial electrification are becoming increasingly prevalent in certain markets, including ERCOT, and many of these facilities are behind-the-meter"; emerging technologies including "distributed renewable energy technologies, energy efficiency, electric vehicles, distributed generation, energy storage devices, fuel cells, nuclear small modular reactors, and linear generators could have a significant impact on the energy industry" and "could make portions of our electric system power supply and transmission and/or distribution facilities obsolete prior to the end of their useful lives"; "we hedge the expected needs of our wholesale and retail customers, but unexpected changes due to weather, natural disasters, consumer behavior, market constraints or other factors could cause us to purchase electricity to meet unexpected demand in periods of high wholesale market prices or resell excess electricity into the wholesale market in periods of low prices"; long-term offtake agreements "enhance the stability and predictability of our cash flows" and "underwrite higher base profitability in the future" — FY2025 · publ. February 2026 · source ↗
  2. ReportedOf up to 6.6 gigawatts of nuclear contracted across three companies in January 2026, Vistra supplied the megawatts that already exist; the rest went to developers of reactors that do not
    Vistra and Meta announce agreements to support nuclear plants in PJM, 9 January 2026 — twenty-year power purchase agreements under which Vistra will supply Meta with a total of 2,609 MW of carbon-free power and capacity from its PJM nuclear plants: 1,268 MW of energy and capacity from Perry and 908 MW from Davis-Besse, plus 213 MW of uprate energy and capacity from Perry, 80 MW from Davis-Besse and 140 MW from Beaver Valley; delivery commences on a portion of the operating energy and capacity in late 2026 with full delivery by year end 2027, and uprate delivery commences in 2031 with full delivery by year end 2034; Vistra agreed to be the preferred power partner for Helix Digital Infrastructure, a newly formed company designed to develop infrastructure for AI-oriented hyperscalers. Meta contracted up to 6.6 GW of nuclear power across agreements with Vistra, Oklo and TerraPower announced the same day — January 2026 · publ. January 2026 · source ↗
  3. ReportedVistra's answer is Helix Digital Infrastructure, a newly formed company developing infrastructure for AI-oriented hyperscalers, for which Vistra agreed to be the preferred power partner
    Vistra and Meta announce agreements to support nuclear plants in PJM, 9 January 2026 — twenty-year power purchase agreements under which Vistra will supply Meta with a total of 2,609 MW of carbon-free power and capacity from its PJM nuclear plants: 1,268 MW of energy and capacity from Perry and 908 MW from Davis-Besse, plus 213 MW of uprate energy and capacity from Perry, 80 MW from Davis-Besse and 140 MW from Beaver Valley; delivery commences on a portion of the operating energy and capacity in late 2026 with full delivery by year end 2027, and uprate delivery commences in 2031 with full delivery by year end 2034; Vistra agreed to be the preferred power partner for Helix Digital Infrastructure, a newly formed company designed to develop infrastructure for AI-oriented hyperscalers. Meta contracted up to 6.6 GW of nuclear power across agreements with Vistra, Oklo and TerraPower announced the same day — January 2026 · publ. January 2026 · source ↗
Sources
Generated September 23, 2026