aid: iso-new-england url: https://raw.githubusercontent.com/api-evangelist/iso-new-england/refs/heads/main/apis.yml name: ISO New England kind: company description: ISO New England Inc. is the independent, nonprofit regional transmission organization authorized by the Federal Energy Regulatory Commission to operate the high-voltage power system, administer the wholesale electricity markets, and plan the power system for Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, and most of Maine. Home market is the United States. It sits at the wholesale layer of the value chain, between generators, transmission owners, interconnections with New York and Canada, and the load-serving entities that resell power to retail customers - and it states on its own site that handling retail electricity is something it does not do. Its API posture is the sector's classic split, read from the wholesale end. Market and system data is genuinely open, so open that the ISO Express portal serves full nodal day-ahead LMP files as anonymous CSV and the public dashboards are backed by an anonymous JSON feed. Consumer data does not exist here at all, and cannot, because ISO New England holds no retail customer relationships and no Green Button, ESPI, or consumer data-portability mandate reaches it. The one documented programmatic contract, the Web Services API v1.1, is a real, richly documented RESTful surface of 477 path templates across 90 market and operations resources, but it answers 401 to anonymous callers - a developer must first create a free, self-serve ISO Express account, which the ISO says automatically grants access to the data feeds, and then authenticate with HTTP Basic over SSL. accessModel: pricing: free onboarding: self-serve trial: false try_now: false public: false label: Free - Self-serve ISO Express account required for the API confidence: high source: - probe - documentation generated: '2026-07-27' method: observed image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/groq.png tags: - Energy - United States - Electricity - Energy Markets - Grid - Open Data - Wholesale Markets - Demand Response - Renewables - New England created: '2026-07-27' modified: '2026-07-27' specificationVersion: '0.19' apis: - aid: iso-new-england:iso-ne-web-services-api name: ISO New England Web Services API v1.1 description: ISO New England's RESTful interface to energy and market data, deployed November 2013 and still the current version. The public Enunciate-generated technical documentation at webservices.iso-ne.com/docs/v1.1/ publishes one page per path template - 489 GET path templates across 91 root resources were harvested from it on 2026-07-27, of which the overview page lists 477 - five-minute and hourly locational marginal prices, day-ahead and real-time demand, generation fuel mix, system load, external interchange and flows, day-ahead and real-time constraints, operating reserve and reserve prices, regulation clearing prices, Forward Capacity Market auction and reconfiguration results, FTR auction clearing prices and results, NCPC, outages, seven-day and seven-day wind forecasts, load forecasts, power system status and conditions, demand response dispatch and price-response events, locations, and hourly-bid participant resources. Every feed is available in XML and JSON, selected by a .xml/.json extension on the request URL or by an Accept header. A WADL description is published at https://webservices.iso-ne.com/api/v1.1?_wadl&_type=xml but is itself behind authentication. Authentication is HTTP Basic over SSL; anonymous requests to the base path, to any resource, and to the WADL all return HTTP 401. Credentials come from a free ISO Express account, which ISO New England states automatically grants access to the data feeds. Two W3C XML Schemas describing the whole payload model are published anonymously alongside the documentation (docs/v1.1/ns0.xsd, 205 complex types, and docs/v1.1/ns1.xsd) and are saved verbatim under schemas/; the OpenAPI under openapi/ was derived from those documents by API Evangelist, not published by ISO New England. humanURL: https://webservices.iso-ne.com/docs/v1.1/ baseURL: https://webservices.iso-ne.com/api/v1.1 tags: - Energy Markets - Electricity - Grid - Pricing - Demand - Forecasting properties: - type: APIReference url: https://webservices.iso-ne.com/docs/v1.1/ - type: Documentation url: https://www.iso-ne.com/participate/support/web-services-data - type: Documentation url: https://www.iso-ne.com/participate/applications-status-changes/access-software-systems - type: Documentation url: https://www.iso-ne.com/static-assets/documents/2017/06/webservices_documentation.xlsx - type: SignUp url: https://www.iso-ne.com/signup - type: Portal url: https://www.iso-ne.com/isoexpress/ - type: OpenAPI name: ISO New England Web Services API v1.1 (derived from the published Enunciate documentation and XSDs) url: openapi/iso-new-england-web-services-openapi.yml - type: XMLSchema url: schemas/iso-new-england-web-services-ns0.xsd - type: XMLSchema url: schemas/iso-new-england-web-services-ns1.xsd - type: XMLSchema url: schemas/nextt-web-services.xsd - type: JSONSchema url: json-schema/iso-new-england-web-services-schemas.json - type: Examples url: examples/_index.yml - type: Overlay url: overlays/iso-new-england-web-services-overlay.yaml - type: DataModel url: data-model/iso-new-england-data-model.yml - type: ErrorCatalog url: errors/iso-new-england-problem-types.yml - type: MCPServer url: mcp/iso-new-england-mcp.yml - type: WADL url: https://webservices.iso-ne.com/api/v1.1?_wadl&_type=xml common: - type: AgenticAccess url: agentic-access/iso-new-england-agentic-access.yml - type: DomainSecurity url: security/iso-new-england-domain-security.yml - type: Authentication url: authentication/iso-new-england-authentication.yml - type: OpenAPI name: ISO New England Web Services API v1.1 (derived) url: openapi/iso-new-england-web-services-openapi.yml - type: JSONSchema url: json-schema/iso-new-england-web-services-schemas.json - type: Examples url: examples/_index.yml - type: Vocabulary url: vocabulary/iso-new-england-vocabulary.yml - type: Conventions url: conventions/iso-new-england-conventions.yml - type: ErrorCatalog url: errors/iso-new-england-problem-types.yml - type: Lifecycle url: lifecycle/iso-new-england-lifecycle.yml - type: ChangeLog url: changelog/iso-new-england-changelog.yml - type: Conformance url: conformance/iso-new-england-conformance.yml - type: Compliance name: NERC and NPCC Compliance (mandatory reliability standards - no infosec certification is published) url: https://www.iso-ne.com/participate/rules-procedures/nerc-npcc - type: Packages url: packages/iso-new-england-packages.yml - type: WellKnown url: well-known/iso-new-england-well-known.yml - type: MCPServer name: Candidate MCP tool set derived from the OpenAPI (no server is published by ISO New England) url: mcp/iso-new-england-mcp.yml - type: DataModel url: data-model/iso-new-england-data-model.yml - type: Overlay url: overlays/iso-new-england-web-services-overlay.yaml - type: LLMsTxt url: llms/iso-new-england-llms.txt - type: AgentSkill url: skills/_index.yml - type: Arazzo name: ISO New England grid snapshot url: arazzo/iso-new-england-grid-snapshot.yml - type: Arazzo name: ISO New England price spike diagnosis url: arazzo/iso-new-england-price-spike-diagnosis.yml - type: Website url: https://www.iso-ne.com/ - type: Portal url: https://www.iso-ne.com/isoexpress/ - type: APIReference url: https://webservices.iso-ne.com/docs/v1.1/ - type: Documentation url: https://www.iso-ne.com/participate/support/web-services-data - type: SignUp url: https://www.iso-ne.com/signup - type: Documentation url: https://www.iso-ne.com/markets-operations/iso-express - type: Regulation url: https://www.iso-ne.com/markets-operations/transmission-operations-services/oasis - type: Blog url: https://isonewswire.com/ - type: BlogRSS url: https://isonewswire.com/feed/ - type: LinkedIn url: https://www.linkedin.com/company/iso-new-england/ - type: Twitter url: https://twitter.com/isonewengland - type: YouTube url: https://www.youtube.com/@isonewengland - type: GitHubOrganization url: https://github.com/iso-ne - type: Support url: https://askiso.iso-ne.com/s/ - type: DeveloperPortal url: https://www.iso-ne.com/participate/support/web-services-data - type: GettingStarted name: Requests to Access Software and Systems - the data-feeds access rule url: https://www.iso-ne.com/participate/applications-status-changes/access-software-systems#data-feeds - type: FAQ url: https://www.iso-ne.com/participate/support/faq - type: Glossary url: https://www.iso-ne.com/participate/support/glossary-acronyms - type: Roadmap name: Key Projects - the ISO's published forward work programme url: https://www.iso-ne.com/committees/key-projects/ - type: TermsOfService name: Legal and Privacy (terms of use and website conditions) url: https://www.iso-ne.com/legal-privacy - type: PrivacyPolicy name: Legal and Privacy (cookies and website data collection) url: https://www.iso-ne.com/legal-privacy maintainers: - FN: Kin Lane email: kin@apievangelist.com