Constellation Energy

Constellation Energy Corporation is a Fortune 500 clean-energy producer and competitive retail electricity and natural gas supplier in the United States, generating power from a fleet of nuclear, hydro, wind, and solar facilities. Constellation does not publish a public developer portal; programmatic interactions are delivered to enterprise and large commercial customers through the Energy Manager platform (account-managed onboarding, no public API specifications) and consumer interactions are handled through the My Constellation account portal. EDI 867 (usage) and 810 (invoice) remain the most common machine-to-machine integration paths and are arranged on a contract-by-contract basis.

Constellation Energy publishes 1 API contract indexed on the APIs.io network. Tagged areas include Clean Energy, Electricity, Energy, Fortune 500, and Hydro.

Constellation Energy’s developer surface includes support and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

6.3/100 minimal ▬ flat Agent 1/100 human only Front door AI 3/6 light saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeNo public API

1 published contract

Clean Energy Electricity Energy Fortune 500HydroNatural Gas Nuclear Solar Utility Wind

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 6.3/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.8 / 17

Access Clarity 0.9 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.7 / 15

Agent readiness — 1/100 · 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 7 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 4.8 — up to +19.0 composite points
Access Clarity scores 5.3 — up to +18.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/constellation-energy/apis.yml: open an issue on github.com/api-evangelist/constellation-energy to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Constellation Energy API

OPEN COLLECTION

Constellation Energy API pricing

Not yet checked against Constellation Energy's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against Constellation Energy's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Constellation Energy Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Constellation Energy Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Constellation Energy Finops

FINOPS

Security Posture 1

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

Constellation Energy Domain Security

TLSv1.2 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

My Constellation Portal

My Constellation Portal

Build 1

SDKs, sample code, and the tooling you integrate with

Energy Management Tools

Energy Management Tools

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

PrivacyPolicy

TermsOfService

Company 4

The organization behind the API

LinkedIn

Website

Website

Investor Relations

Investor Relations

Careers

Careers

Other 2

Properties that don't map to a standard resource type

Customer Site

Customer Site

Energy Manager

Energy Manager

Source (apis.yml)

aid: constellation-energy
name: Constellation Energy
url: ''
x-api-posture: no-product-api
x-api-posture-basis: observed https://raw.githubusercontent.com/api-evangelist/constellation-energy/refs/heads/main/apis.yml
tags:
- Clean Energy
- Electricity
- Energy
- Fortune 500
- Hydro
- Natural Gas
- Nuclear
- Solar
- Utility
- Wind
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  gated: private
  gated_source:
  - x-api-posture
  label: Free
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/constellation-energy.png
access: 3rd-Party
created: '2026-03-21'
modified: '2026-04-29'
position: Consuming
specificationVersion: '0.23'
kind: company
description: Constellation Energy Corporation is a Fortune 500 clean-energy producer and competitive retail electricity and
  natural gas supplier in the United States, generating power from a fleet of nuclear, hydro, wind, and solar facilities.
  Constellation does not publish a public developer portal; programmatic interactions are delivered to enterprise and large
  commercial customers through the Energy Manager platform (account-managed onboarding, no public API specifications) and
  consumer interactions are handled through the My Constellation account portal. EDI 867 (usage) and 810 (invoice) remain
  the most common machine-to-machine integration paths and are arranged on a contract-by-contract basis.
apis: []
common:
- type: Plans
  url: plans/constellation-energy-plans-pricing.yml
- type: RateLimits
  url: rate-limits/constellation-energy-rate-limits.yml
- type: FinOps
  url: finops/constellation-energy-finops.yml
- type: DomainSecurity
  url: security/constellation-energy-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/constellation-energy
- type: Website
  url: https://www.constellationenergy.com
- type: Customer Site
  url: https://www.constellation.com
- type: My Constellation Portal
  url: https://my-account.constellationconnect.com
- type: Energy Manager
  url: https://energymanager.constellation.com
- type: Energy Management Tools
  url: https://www.constellation.com/why/energy-management-tools.html
- type: Investor Relations
  url: https://investors.constellationenergy.com
- type: Careers
  url: https://jobs.constellationenergy.com
- type: PrivacyPolicy
  url: https://www.constellationenergy.com/privacy.html
- type: TermsOfService
  url: https://www.constellation.com/terms-of-use.html
- type: Support
  url: https://www.constellation.com/about-us/contact-us.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Constellation Energy API — frequently asked questions

How much does the Constellation Energy API cost?

APIs.io lists 1 pricing plan for Constellation Energy, with each plan's price, limits and inclusions under Pricing on this page.

Is the Constellation Energy API ready for AI agents?

Constellation Energy has a Kin Score of 6.3 out of 100 (minimal) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-06.

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Tools for providers

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Every operation they expose

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How their score was established

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