openapi: 3.2.0 info: title: ISO New England Web Services API v1.1 Hourlyloadforecast 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: hourlyloadforecast description: 5 path template(s) under /hourlyloadforecast in the published ISO New England Web Services API v1.1 documentation. paths: /hourlyloadforecast: get: operationId: getHourlyloadforecast summary: Default resource description: Default resource. Redirects to Load Forecast Info . tags: - hourlyloadforecast 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.hourlyloadforecast.html harvested: '2026-07-27' /hourlyloadforecast/all/day/{day}: get: operationId: getHourlyloadforecastAllDayByDay summary: Get Hourly System Load Forecast for given day description: Get Hourly System Load Forecast for given day tags: - hourlyloadforecast responses: '200': description: a HourlyLoadForecastsElement containing the Hourly System Load Forecast. content: application/xml: schema: $ref: '#/components/schemas/HourlyLoadForecasts' application/json: schema: $ref: '#/components/schemas/HourlyLoadForecasts' '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.hourlyloadforecast.all.day.day.html harvested: '2026-07-27' x-xml-element: HourlyLoadForecasts parameters: - name: day in: path required: true schema: type: string description: The day to retrieve data for (YYYYMMDD) /hourlyloadforecast/current: get: operationId: getHourlyloadforecastCurrent summary: Get the current Hourly System Load Forecast description: Get the current Hourly System Load Forecast. tags: - hourlyloadforecast responses: '200': description: a HourlyLoadForecastElement containing the current Hourly System LoadForecast. content: application/xml: schema: $ref: '#/components/schemas/HourlyLoadForecast' application/json: schema: $ref: '#/components/schemas/HourlyLoadForecast' example: HourlyLoadForecast: - NetLoadMw: 13320 CreationDate: '2026-07-27T16:21:15.000-04:00' LoadMw: 13320 BeginDate: '2026-07-29T23:00:00.000-04:00' '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.hourlyloadforecast.current.html harvested: '2026-07-27' x-xml-element: HourlyLoadForecast 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. /hourlyloadforecast/day/{day}: get: operationId: getHourlyloadforecastDayByDay summary: Get Hourly System Load Forecast for given day description: Get Hourly System Load Forecast for given day tags: - hourlyloadforecast responses: '200': description: a HourlyLoadForecastsElement containing the Hourly System Load Forecast. content: application/xml: schema: $ref: '#/components/schemas/HourlyLoadForecasts' application/json: schema: $ref: '#/components/schemas/HourlyLoadForecasts' '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.hourlyloadforecast.day.day.html harvested: '2026-07-27' x-xml-element: HourlyLoadForecasts parameters: - name: day in: path required: true schema: type: string description: The day to retrieve data for (YYYYMMDD) /hourlyloadforecast/info: get: operationId: getHourlyloadforecastInfo summary: Get the Service Info for Five Minute LMPs description: Get the Service Info for Five Minute LMPs. tags: - hourlyloadforecast responses: '200': description: the ServiceInfoElement for Load Forecast LMPs. 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.hourlyloadforecast.info.html harvested: '2026-07-27' x-xml-element: ServiceInfo components: schemas: HourlyLoadForecasts: type: object properties: HourlyLoadForecast: type: array items: $ref: '#/components/schemas/HourlyLoadForecast' x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HourlyLoadForecasts 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 HourlyLoadForecast: type: object properties: BeginDate: type: string format: date-time CreationDate: type: string format: date-time LoadMw: type: number LoadAdjustmentMw: type: number NetLoadMw: type: number required: - BeginDate - CreationDate x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HourlyLoadForecast 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