openapi: 3.2.0 info: title: ISO New England Web Services API v1.1 Hourlyprelimreserveprice 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: hourlyprelimreserveprice description: 7 path template(s) under /hourlyprelimreserveprice in the published ISO New England Web Services API v1.1 documentation. paths: /hourlyprelimreserveprice: get: operationId: getHourlyprelimreserveprice summary: Default resource description: Default resource. Redirects to Hourly Prelim Reserve Price. tags: - hourlyprelimreserveprice 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.hourlyprelimreserveprice.html harvested: '2026-07-27' /hourlyprelimreserveprice/current: get: operationId: getHourlyprelimreservepriceCurrent summary: Get the current Hourly Prelim Reserve Prices for all locations description: Get the current Hourly Prelim Reserve Prices for all locations. tags: - hourlyprelimreserveprice responses: '200': description: a PrelimHourlyReservePricesElement containing the current Hourly Prelim Reserve Prices. content: application/xml: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' application/json: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' '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.hourlyprelimreserveprice.current.html harvested: '2026-07-27' x-xml-element: PrelimHourlyReservePrices /hourlyprelimreserveprice/current/locationType/{locationType}: get: operationId: getHourlyprelimreservepriceCurrentLocationTypeByLocationType summary: Get the current Hourly Prelim Reserve Prices for a given location type description: Get the current Hourly Prelim Reserve Prices for a given location type. tags: - hourlyprelimreserveprice responses: '200': description: a PrelimHourlyReservePricesElement containing the current Hourly Prelim Reserve Prices for the given location. content: application/xml: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' application/json: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' '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.hourlyprelimreserveprice.current.locationType.locationType.html harvested: '2026-07-27' x-xml-element: PrelimHourlyReservePrices parameters: - name: locationType in: path required: true schema: type: string description: The locationType /hourlyprelimreserveprice/current/reserveZone/{reserveZoneId}: get: operationId: getHourlyprelimreservepriceCurrentReserveZoneByReserveZoneId summary: Get the current Hourly Prelim Reserve Prices for a given location description: Get the current Hourly Prelim Reserve Prices for a given location. tags: - hourlyprelimreserveprice responses: '200': description: a PrelimHourlyReservePriceElement containing the current Hourly Prelim Reserve Price for the given ReserveZoneId. content: application/xml: schema: $ref: '#/components/schemas/PrelimHourlyReservePrice' application/json: schema: $ref: '#/components/schemas/PrelimHourlyReservePrice' '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.hourlyprelimreserveprice.current.reserveZone.reserveZoneId.html harvested: '2026-07-27' x-xml-element: PrelimHourlyReservePrice parameters: - name: reserveZoneId in: path required: true schema: type: string /hourlyprelimreserveprice/day/{day}: get: operationId: getHourlyprelimreservepriceDayByDay summary: Get an entire days Hourly Prelim Reserve Prices for a given Date description: Get an entire days Hourly Prelim Reserve Prices for a given Date. Only the past [?] days are supported. tags: - hourlyprelimreserveprice responses: '200': description: a PrelimHourlyReservePricesElement containing the Hourly Prelim Reserve Prices. content: application/xml: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' application/json: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' '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.hourlyprelimreserveprice.day.day.html harvested: '2026-07-27' x-xml-element: PrelimHourlyReservePrices parameters: - name: day in: path required: true schema: type: string description: The day to retrieve data for (YYYYMMDD) /hourlyprelimreserveprice/day/{day}/reserveZone/{reserveZoneId}: get: operationId: getHourlyprelimreservepriceDayByDayReserveZoneByReserveZoneId summary: Get an entire days Hourly Prelim Reserve Prices for a given Reserve Zone description: Get an entire days Hourly Prelim Reserve Prices for a given Reserve Zone. Only the past [?] days are supported. tags: - hourlyprelimreserveprice responses: '200': description: a PrelimHourlyReservePricesElement containing the Hourly Prelim Reserve Prices. content: application/xml: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' application/json: schema: $ref: '#/components/schemas/PrelimHourlyReservePrices' '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.hourlyprelimreserveprice.day.day.reserveZone.reserveZoneId.html harvested: '2026-07-27' x-xml-element: PrelimHourlyReservePrices parameters: - name: day in: path required: true schema: type: string description: The day to retrieve data for (YYYYMMDD) - name: reserveZoneId in: path required: true schema: type: string description: The reserve Zone Id /hourlyprelimreserveprice/info: get: operationId: getHourlyprelimreservepriceInfo summary: Get the Service Info for Hourly Prelim Reserve Price description: Get the Service Info for Hourly Prelim Reserve Price. tags: - hourlyprelimreserveprice responses: '200': description: the ServiceInfoElement for Hourly Prelim Reserve Price. 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.hourlyprelimreserveprice.info.html harvested: '2026-07-27' x-xml-element: ServiceInfo components: schemas: ReservePrice: type: object properties: BeginDate: type: string format: date-time ReserveZoneId: type: integer ReserveZoneName: type: string TenMinSpinRequirement: type: number Total10MinRequirement: type: number Total30MinRequirement: type: number TmsrDesignatedMw: type: number TmnsrDesignatedMw: type: number TmorDesignatedMw: type: number TmsrClearingPrice: type: number TmnsrClearingPrice: type: number TmorClearingPrice: type: number IntervalBeginDate: type: string format: date-time required: - BeginDate x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_ReservePrice PrelimHourlyReservePrices: type: object properties: PrelimHourlyReservePrice: type: array items: $ref: '#/components/schemas/PrelimHourlyReservePrice' x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_PrelimHourlyReservePrices PrelimHourlyReservePrice: $ref: '#/components/schemas/ReservePrice' x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_PrelimHourlyReservePrice 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 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