# Sempra

> Sempra is a San Diego-headquartered North American energy infrastructure holding company
> and a Fortune 500 constituent, operating regulated utilities and energy infrastructure
> across California, Texas and Mexico — San Diego Gas & Electric, Southern California Gas
> Company, an ownership interest in Oncor Electric Delivery, and Sempra Infrastructure.
> Sempra runs a Google Apigee API program, but publishes no API contract, reference,
> plan or rate limit to unauthenticated visitors.

This file was generated by API Evangelist (https://apievangelist.com) from an independent,
third-party profile of Sempra's PUBLIC API surface on 2026-09-04. It is not published by
Sempra. Sempra serves no llms.txt of its own — https://www.sempra.com/llms.txt answered
HTTP 403 behind a Cloudflare managed challenge.

## What is callable today

- [Sempra Developer Portal APIs](https://developer.sempra.com): a Google Apigee program.
  A live OAuth 2.0-protected proxy is routed at https://api.sempra.com/v1 — every path
  under /v1 returns HTTP 401 with an Apigee `oauth.v2.InvalidAccessToken` fault and an
  RFC 6750 `WWW-Authenticate: Bearer` challenge, while `/`, `/v2/*`, `/oauth/token` and
  `/openapi.json` return the Apigee `messaging.adaptors.http.flow.ApplicationNotFound`
  not-routed 404. There is a real API. There is no way to learn what it does without
  registering.

## What is NOT published (verified 2026-09-04, not assumed)

- No OpenAPI, Swagger, GraphQL SDL, AsyncAPI or Postman collection anywhere.
- No API reference, operation list, scope list or object model.
- No plans, pricing, quotas or rate limits — the portal's own anonymous catalog endpoint
  `/portals/api/sites/sempra-prod/liveportal/apis` returns `"apiDocs": []` and
  `"apiProducts": []`.
- No SDK, CLI or client library in npm, PyPI, RubyGems or crates.io; no GitHub organization.
- No MCP server, no A2A agent card, no `/.well-known/` document on any host.
- No API status page, changelog, deprecation policy or SLA.

## Artifacts in this profile

- [Authentication profile](authentication/sempra-authentication.yml) — probed, OAuth 2.0 bearer
- [Error catalog](errors/sempra-problem-types.yml) — probed, Apigee fault envelope (not RFC 9457)
- [API conventions](conventions/sempra-conventions.yml) — probed, incl. idempotency + reversibility
- [Lifecycle](lifecycle/sempra-lifecycle.yml) — probed, URI-path versioning at /v1
- [Conformance](conformance/sempra-conformance.yml) — probed standards posture
- [Plans and pricing](plans/sempra-plans-pricing.yml) — plan_count 0
- [Rate limits](rate-limits/sempra-rate-limits.yml) — limit_count 0
- [Packages](packages/sempra-packages.yml) — package_count 0
- [Well-known probe](well-known/sempra-well-known.yml) — hit_count 0
- [Domain security](security/sempra-domain-security.yml) — probed TLS/SPF/DMARC

## Company

- [Website](https://www.sempra.com)
- [Newsroom](https://www.sempra.com/newsroom)
- [Investors](https://www.sempra.com/investors)
- [Contact](https://www.sempra.com/contact-us)
- [Privacy](https://www.sempra.com/privacy)
- [Terms and conditions](https://www.sempra.com/terms-and-conditions)
- [LinkedIn](https://www.linkedin.com/company/sempra)

## Related Sempra developer portals (separate Apigee organizations, also empty anonymously)

- https://developer.sdge.com — San Diego Gas & Electric, Apigee org `sdge`, site `sdge-prod`
- https://developer.socalgas.com — Southern California Gas, Apigee org `socalgas`, site `socalgas-prod`