Calpine

Calpine Corporation was a major U.S. energy company headquartered in Houston, Texas, and was the largest generator of electricity from natural gas and geothermal energy in the United States. It operated 80 power plants with approximately 26,035 megawatts of generation capacity, including The Geysers, the world's largest geothermal complex. Calpine also operated the Champion Energy retail electricity subsidiary serving deregulated markets. As of January 2026, Constellation Energy completed its acquisition of Calpine for $16.4 billion, making it a business unit of Constellation. Calpine does not publish a public developer API program.

Calpine is profiled on the APIs.io network. Tagged areas include Electricity, Energy, Geothermal, Natural Gas, and Power Generation.

Calpine’s developer surface includes engineering blog and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

4.0/100 minimal ▬ flat Agent 0/100 human only Front door AI 1/6 silent Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

0 APIs

Electricity Energy Geothermal Natural Gas Power GenerationRetail ElectricityUtilities Fortune 500

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 4.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.4 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.7 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Energy & Utilities regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/calpine: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Calpine Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Press 8

Recent news and press coverage referencing this provider.

Constellation’s Calpine Deal Clears Texas Regulatory Review

Calpine Ramps Up Investment in Texas Grid with Quail Run Acquisition

Calpine Announces Execution of Full-Scale Demonstration Project Cost Sharing Agreement ...

Calpine Secures Texas Energy Fund Loan for Pin Oak Creek Peaking Facility in Freestone ...

Calpine, ExxonMobil Sign CO2 Transportation and Storage Agreement for Power Generation ...

Calpine Accelerates PJM Development Program

Calpine and CyrusOne Announce Phase 2 of Powered Land Agreement to Support Hyperscale D...

Andrew Novotny Takes the Helm as Calpine’s New CEO

Scroll for all 8

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 3

Properties that don't map to a standard resource type

Wikipedia

Wikipedia

Champion Energy

Champion Energy

Parent Company

Parent Company

Source (apis.yml)

aid: calpine
name: Calpine
url: https://raw.githubusercontent.com/api-evangelist/calpine/refs/heads/main/apis.yml
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/calpine.png
type: Index
tags:
- Electricity
- Energy
- Geothermal
- Natural Gas
- Power Generation
- Retail Electricity
- Utilities
- Fortune 500
created: '2024-01-01'
modified: '2026-04-23'
specificationVersion: '0.23'
description: Calpine Corporation was a major U.S. energy company headquartered in Houston, Texas, and was the largest generator
  of electricity from natural gas and geothermal energy in the United States. It operated 80 power plants with approximately
  26,035 megawatts of generation capacity, including The Geysers, the world's largest geothermal complex. Calpine also operated
  the Champion Energy retail electricity subsidiary serving deregulated markets. As of January 2026, Constellation Energy
  completed its acquisition of Calpine for $16.4 billion, making it a business unit of Constellation. Calpine does not publish
  a public developer API program.
apis: []
common:
- type: DomainSecurity
  url: security/calpine-domain-security.yml
- type: Website
  url: https://www.calpine.com
- type: Wikipedia
  url: https://en.wikipedia.org/wiki/Calpine
- type: Champion Energy
  url: https://www.championenergyservices.com/
- type: Parent Company
  url: https://www.constellationenergy.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/calpine
- url: https://www.calpine.com/feed/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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