openapi: 3.2.0 info: title: ISO New England Web Services API v1.1 Fiveminutesystemload API version: '1.1' description: RESTful interface to ISO New England energy and market data. This OpenAPI document was DERIVED by API Evangelist from ISO New England's own published, machine-generated Enunciate technical documentation at https://webservices.iso-ne.com/docs/v1.1/ and the two XML Schemas it publishes (ns0.xsd, ns1.xsd, saved verbatim under schemas/). ISO New England does not publish an OpenAPI definition; the only provider-published machine-readable description of the interface is a WADL at https://webservices.iso-ne.com/api/v1.1?_wadl&_type=xml, which sits behind the same HTTP Basic authentication as the API and returned HTTP 401 to anonymous probes. Every path, method, parameter, description, media type and schema in this document is copied from the provider's published sources; nothing was invented. Each operation carries x-evidence naming the exact documentation page it came from. All feeds are available in XML and JSON, selected by adding a .xml or .json extension to the request URL or by sending an Accept header of application/xml or application/json. contact: name: ISO New England Ask ISO url: https://askiso.iso-ne.com/s/ x-provenance: method: derived derived_by: API Evangelist enrichment pipeline derived_on: '2026-07-27' sources: - https://webservices.iso-ne.com/docs/v1.1/ - https://webservices.iso-ne.com/docs/v1.1/ns0.xsd - https://webservices.iso-ne.com/docs/v1.1/ns1.xsd - https://www.iso-ne.com/participate/support/web-services-data not_provider_published: true note: Derived from provider-published HTML documentation and XSDs. Not an ISO New England artifact. servers: - url: https://webservices.iso-ne.com/api/v1.1 description: Production base path (HTTP Basic over SSL) security: - basicAuth: [] tags: - name: fiveminutesystemload description: 4 path template(s) under /fiveminutesystemload in the published ISO New England Web Services API v1.1 documentation. paths: /fiveminutesystemload: get: operationId: getFiveminutesystemload summary: Default resource description: Default resource. Redirects to Five Minute System Load Info. tags: - fiveminutesystemload responses: '200': description: Successful response. content: application/xml: schema: description: Response payload is not described in the published documentation. application/json: schema: description: Response payload is not described in the published documentation. '401': description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27. x-evidence: source: https://webservices.iso-ne.com/docs/v1.1/rest.fiveminutesystemload.html harvested: '2026-07-27' /fiveminutesystemload/current: get: operationId: getFiveminutesystemloadCurrent summary: Get the current Five Minute System Load for all locations description: Get the current Five Minute System Load for all locations. tags: - fiveminutesystemload responses: '200': description: a FiveMinSystemLoadElement containing the current Five Minute System Load. content: application/xml: schema: $ref: '#/components/schemas/FiveMinSystemLoad' application/json: schema: $ref: '#/components/schemas/FiveMinSystemLoad' example: FiveMinSystemLoad: - SystemLoadBtmPv: 19358.383 NativeLoadBtmPv: 19330.783 NativeLoad: 17004.273 LoadMw: 17031.873 BeginDate: '2026-07-27T17:20:00.000-04:00' ArdDemand: 27.6 '401': description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27. x-evidence: source: https://webservices.iso-ne.com/docs/v1.1/rest.fiveminutesystemload.current.html harvested: '2026-07-27' x-xml-element: FiveMinSystemLoad x-example-evidence: source: https://www.iso-ne.com/ws/wsclient (public ISO Express dashboard proxy, anonymous POST) observed: '2026-07-27' note: Real response payload observed anonymously through the public dashboard proxy; the proxy envelope and its _url key were removed. /fiveminutesystemload/day/{day}: get: operationId: getFiveminutesystemloadDayByDay summary: Get an entire days Five Minute System Loads for a given day description: Get an entire days Five Minute System Loads for a given day. Only the past [?] days are supported. tags: - fiveminutesystemload responses: '200': description: a FiveMinSystemLoadElement containing the Five Minute System loads. content: application/xml: schema: $ref: '#/components/schemas/FiveMinSystemLoads' application/json: schema: $ref: '#/components/schemas/FiveMinSystemLoads' '401': description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27. x-evidence: source: https://webservices.iso-ne.com/docs/v1.1/rest.fiveminutesystemload.day.day.html harvested: '2026-07-27' x-xml-element: FiveMinSystemLoads parameters: - name: day in: path required: true schema: type: string description: The day to retrieve data for (YYYYMMDD) /fiveminutesystemload/info: get: operationId: getFiveminutesystemloadInfo summary: Get the Service Info for Five Minute System Load description: Get the Service Info for Five Minute System Load. tags: - fiveminutesystemload responses: '200': description: the ServiceInfoElement for Five Minute System Load. content: application/xml: schema: $ref: '#/components/schemas/ServiceInfo' application/json: schema: $ref: '#/components/schemas/ServiceInfo' '401': description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27. x-evidence: source: https://webservices.iso-ne.com/docs/v1.1/rest.fiveminutesystemload.info.html harvested: '2026-07-27' x-xml-element: ServiceInfo components: schemas: FiveMinSystemLoad: type: object properties: BeginDate: type: string format: date-time LoadMw: type: number NativeLoad: type: number ArdDemand: type: number SystemLoadBtmPv: type: number NativeLoadBtmPv: type: number required: - BeginDate x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinSystemLoad ServiceInfo: type: object properties: LatestBeginDate: type: string format: date-time CreationDate: type: string format: date-time required: - LatestBeginDate - CreationDate x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_ServiceInfo FiveMinSystemLoads: type: object properties: FiveMinSystemLoad: type: array items: $ref: '#/components/schemas/FiveMinSystemLoad' x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinSystemLoads securitySchemes: basicAuth: type: http scheme: basic description: HTTP Basic Authentication over SSL. Credentials come from a free, self-serve ISO Express account; ISO New England states that ISO Express account holders are automatically granted access to the public data feeds. See https://www.iso-ne.com/participate/applications-status-changes/access-software-systems