National Grid ESO

National Energy System Operator (NESO) provides open data APIs for the UK electricity system, including carbon intensity forecasts, demand data, generation mix, ancillary services, balancing costs, and operational data for Great Britain's electricity network. The Carbon Intensity API delivers 96+ hour ahead forecasts at both national and regional levels, while the NESO Data Portal (CKAN-based) exposes hundreds of datasets covering the full spectrum of electricity system operations.

National Grid ESO publishes 1 API on the APIs.io network: Carbon Intensity API. Tagged areas include Energy, Electricity, Carbon Intensity, UK, and Open Data.

National Grid ESO’s developer surface includes developer portal, product news, FAQ, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

25.4/100 emerging ▼ -5.2 Agent 19/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreeOpen⚡ Free to try

2 APIs

EnergyElectricityCarbon IntensityUKOpen DataSustainabilityGrid Operations

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 25.4/100 · emerging

Contract Quality 8.1 / 25

Developer Ergonomics 2.6 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 6.9 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/national-grid: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Neso Data Portal Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

FAQ

FAQ

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

License

License

TermsOfService

TermsOfService

Company 2

The organization behind the API

News

News

About

About

Other 1

Properties that don't map to a standard resource type

MediaCentre

MediaCentre

Source (apis.yml)

name: National Grid ESO
description: National Energy System Operator (NESO) provides open data APIs for the UK electricity system, including carbon
  intensity forecasts, demand data, generation mix, ancillary services, balancing costs, and operational data for Great Britain's
  electricity network. The Carbon Intensity API delivers 96+ hour ahead forecasts at both national and regional levels, while
  the NESO Data Portal (CKAN-based) exposes hundreds of datasets covering the full spectrum of electricity system operations.
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Free · Open access
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/national-grid.png
tags:
- Energy
- Electricity
- Carbon Intensity
- UK
- Open Data
- Sustainability
- Grid Operations
url: https://raw.githubusercontent.com/api-evangelist/national-grid/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
apis:
- name: Carbon Intensity API
  description: Official Carbon Intensity forecast API for Great Britain, developed by NESO in partnership with EDF Europe,
    University of Oxford, and WWF. Provides 96+ hour ahead national and regional carbon intensity forecasts, generation mix
    data, and historical carbon intensity statistics across 14 GB regions and by outward postcode.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://carbonintensity.org.uk/
  baseURL: https://api.carbonintensity.org.uk
  tags:
  - Carbon Intensity
  - Electricity
  - Sustainability
  - Forecasting
  - Generation Mix
  - Regional Data
  properties:
  - type: Documentation
    url: https://carbon-intensity.github.io/api-definitions/
  - type: OpenAPI
    url: https://carbon-intensity.github.io/api-definitions/
  - type: GitHubOrganization
    url: https://github.com/carbon-intensity
  - type: TermsOfService
    url: https://github.com/carbon-intensity/terms
  - type: License
    url: https://creativecommons.org/licenses/by/4.0/
  contact:
  - FN: NESO Carbon Intensity Team
    email: lyndon.ruff@nationalgrideso.com
  overlays:
  - type: APIs.io Search
    url: overlays/carbon-intensity-openapi-search.yml
  aid: national-grid:carbon-intensity-api
- name: NESO Data Portal API
  description: CKAN-based REST API providing programmatic access to hundreds of electricity system datasets published by the
    National Energy System Operator. Covers ancillary services, balancing costs, carbon intensity, connection registers, constraint
    management, demand forecasts, generation data, network charges, trading data, Future Energy Scenarios, and more. Rate
    limited to one request per second for the catalog API and two requests per minute for the Datastore (tabular data) API.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.neso.energy/data-portal
  baseURL: https://api.neso.energy/api/3/action
  tags:
  - Energy Data
  - Open Data
  - Demand Forecasting
  - Generation
  - Ancillary Services
  - Balancing Costs
  - Carbon Intensity
  - CKAN
  properties:
  - type: Documentation
    url: https://www.neso.energy/data-portal/api-guidance
  - type: ExternalDocumentation
    url: https://docs.ckan.org/en/2.8/api/
  - type: Portal
    url: https://www.neso.energy/data-portal
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/national-grid/refs/heads/main/rate-limits/neso-data-portal-rate-limits.yml
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/national-grid/refs/heads/main/plans/neso-data-portal-plans.yml
  contact:
  - FN: NESO Open Data Team
    email: box.OpenData.ESO@nationalgrideso.com
  overlays:
  - type: APIs.io Search
    url: overlays/neso-data-portal-openapi-search.yml
  aid: national-grid:neso-data-portal-api
common:
- type: VulnerabilityDisclosure
  url: security/national-grid-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/national-grid-domain-security.yml
- type: Portal
  url: https://www.neso.energy/data-portal
- type: News
  url: https://www.neso.energy/news-and-events
- type: MediaCentre
  url: https://www.neso.energy/news-and-events/media-centre
- type: About
  url: https://www.neso.energy/
- type: License
  url: https://creativecommons.org/licenses/by/4.0/
- type: TermsOfService
  url: https://github.com/carbon-intensity/terms
- type: FAQ
  url: https://www.neso.energy/data-portal/about-data-portal
- type: Support
  url: mailto:box.OpenData.ESO@nationalgrideso.com
- type: GitHubOrganization
  url: https://github.com/carbon-intensity
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

National Grid ESO

Kin Score

APIs 2

Carbon Intensity API

NESO Data Portal API

Pricing Plans 1

Neso Data Portal Plans

Rate Limits 1

Neso Data Portal Rate Limits

FinOps 1

Neso Finops

Security Posture 2

National Grid Domain Security

National Grid Vulnerability Disclosure

Resources