# Vistra Corp

> Vistra Corp (NYSE: VST) is an Irving, Texas integrated retail electricity and power generation company and the largest competitive power generator in the United States, operating roughly 41,000-44,000 MW of natural gas, nuclear, coal, solar and battery storage capacity and serving nearly 5 million retail customers across 16 states and the District of Columbia through TXU Energy, Dynegy, Ambit Energy, Energy Harbor, Homefield Energy and TriEagle Energy. Vistra publishes NO public API: no developer portal, no API host, and no machine-readable contract of any kind. This file is generated by API Evangelist from the catalog record at https://github.com/api-evangelist/vistra-energy, not published by Vistra.

## API posture (read this first)

- No OpenAPI, Swagger, AsyncAPI, GraphQL schema, Postman collection or MCP server exists on any Vistra-controlled domain (probed 2026-07-27).
- developer., developers., docs., api. and data. on vistracorp.com do not resolve; /developers, /api, /docs, /data, /openapi.json, /swagger.json and /.well-known/* return 404.
- The only machine-readable surface served from vistracorp.com is the WordPress CMS REST API that backs the marketing site, which robots.txt disallows. It is infrastructure, not a product API, and is deliberately not catalogued.
- The only customer-data surface is the TXU Energy MyAccount web application (login required). Its interval readings come from Smart Meter Texas, the shared ERCOT meter-data platform operated by the Texas transmission and distribution utilities, not by Vistra.
- Homonym warning: devportal.vistra.com ("API Developer Portal") belongs to Vistra Limited, an unrelated corporate-services and fund-administration firm. It is NOT Vistra Corp the power company.

## Company

- [Vistra Corp](https://www.vistracorp.com/): Corporate site.
- [About Vistra](https://vistracorp.com/about/): Company profile, capacity and footprint.
- [Generation](https://vistracorp.com/generation/): Generation fleet.
- [Operations](https://vistracorp.com/operations/): Luminant and Dynegy operating businesses.
- [Retail](https://vistracorp.com/retail/): The six retail electricity brands, 16 states plus DC.
- [Vistra Zero](https://vistracorp.com/vistra-zero/): Zero-carbon generation portfolio.
- [Sustainability](https://vistracorp.com/sustainability/) and [reporting](https://vistracorp.com/sustainability/reporting/).
- [Corporate governance](https://vistracorp.com/corporate-governance/) and [code of conduct](https://vistracorp.com/code-of-conduct/).
- [Investor relations](https://investor.vistracorp.com/) and [SEC filings](https://vistracorp.com/sec-filings/).
- [Blog](https://vistracorp.com/blog/) and [RSS feed](https://vistracorp.com/feed/).
- [Legislative hub](https://hub.vistracorp.com/our-companies/).
- [Careers](https://vistracorp.com/careers/).

## Retail brands

- [TXU Energy](https://www.txu.com/) — largest brand; [MyAccount customer portal](https://services.txu.com/), [Help Center](https://www.txu.com/help).
- [Dynegy](https://www.dynegy.com/)
- [Ambit Energy](https://www.ambitenergy.com/)
- [Homefield Energy](https://www.homefieldenergy.com/)
- [TriEagle Energy](https://www.trieagleenergy.com/)
- [Energy Harbor](https://www.energyharbor.com/)

## Where the data actually lives (third parties, not Vistra)

- [Smart Meter Texas](https://smartmetertexas.com/): TDU-operated ERCOT meter-data platform where third-party interval-data access is registered in Texas.
- [US DOE Green Button](https://www.energy.gov/data/green-button): Names TXU Energy on the voluntary "Utilities Committed to Implementing Green Button" list. Commitment, not a verified implementation.
- ERCOT, PJM, ISO-NE, NYISO, MISO, CAISO, EIA and FERC publish the open market and generation data about Vistra's fleet. Vistra publishes none of its own.

## Legal

- [Privacy Policy](https://vistracorp.com/privacy-policy/)
- [Terms of Use](https://vistracorp.com/terms-of-use/)
- [Accessibility](https://vistracorp.com/accessibility/)

## API Evangelist artifacts

- [apis.yml](https://raw.githubusercontent.com/api-evangelist/vistra-energy/refs/heads/main/apis.yml): APIs.json catalog record.
- [review.yml](https://raw.githubusercontent.com/api-evangelist/vistra-energy/refs/heads/main/review.yml): Full probe log and the energy-data posture analysis.
- [conformance](https://raw.githubusercontent.com/api-evangelist/vistra-energy/refs/heads/main/conformance/vistra-energy-conformance.yml): Standards checked (Green Button/ESPI, IEEE 2030.5, OpenADR, OCPP/OCPI, IEC CIM, OAuth/OIDC) and what was found.
- [domain security](https://raw.githubusercontent.com/api-evangelist/vistra-energy/refs/heads/main/security/vistra-energy-domain-security.yml): TLS/HSTS/DNSSEC/CAA/SPF/DMARC probe of ten Vistra hosts.
- [well-known index](https://raw.githubusercontent.com/api-evangelist/vistra-energy/refs/heads/main/well-known/vistra-energy-well-known.yml): Every discovery path probed and its status.