openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Hbdayaheadenergyoffer 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: hbdayaheadenergyoffer
  description: 4 path template(s) under /hbdayaheadenergyoffer in the published ISO New England Web Services API v1.1 documentation.
paths:
  /hbdayaheadenergyoffer:
    get:
      operationId: getHbdayaheadenergyoffer
      summary: Default resource
      description: Default resource. Redirects to HbDayAheadEnergyOffer Info.
      tags:
      - hbdayaheadenergyoffer
      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.hbdayaheadenergyoffer.html
        harvested: '2026-07-27'
  /hbdayaheadenergyoffer/current:
    get:
      operationId: getHbdayaheadenergyofferCurrent
      summary: Get the current HbDayAheadEnergyOffersElement for Hub, Load Zones, and External Nodes
      description: Get the current HbDayAheadEnergyOffersElement for Hub, Load Zones, and External Nodes.
      tags:
      - hbdayaheadenergyoffer
      responses:
        '200':
          description: a HbDayAheadEnergyOffersElement containing the current DayAheadEnergyOffer.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HbDayAheadEnergyOffers'
            application/json:
              schema:
                $ref: '#/components/schemas/HbDayAheadEnergyOffers'
        '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.hbdayaheadenergyoffer.current.html
        harvested: '2026-07-27'
      x-xml-element: HbDayAheadEnergyOffers
  /hbdayaheadenergyoffer/day/{day}:
    get:
      operationId: getHbdayaheadenergyofferDayByDay
      summary: Get an entire days HbDayAheadEnergyOffers
      description: Get an entire days HbDayAheadEnergyOffers.
      tags:
      - hbdayaheadenergyoffer
      responses:
        '200':
          description: a HbDayAheadEnergyOfferElement containing the HbDayAheadEnergyOffers.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HbDayAheadEnergyOffers'
            application/json:
              schema:
                $ref: '#/components/schemas/HbDayAheadEnergyOffers'
        '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.hbdayaheadenergyoffer.day.day.html
        harvested: '2026-07-27'
      x-xml-element: HbDayAheadEnergyOffers
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /hbdayaheadenergyoffer/info:
    get:
      operationId: getHbdayaheadenergyofferInfo
      summary: Get the Service Info for HbDayAheadEnergyOffers
      description: Get the Service Info for HbDayAheadEnergyOffers.
      tags:
      - hbdayaheadenergyoffer
      responses:
        '200':
          description: the ServiceInfoElement for HbDayAheadEnergyOffers.
          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.hbdayaheadenergyoffer.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
components:
  schemas:
    Segments:
      type: object
      properties:
        Segment:
          type: array
          items:
            $ref: '#/components/schemas/Segment'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Segments
    Segment:
      type: object
      properties:
        Price:
          type: number
        Mw:
          type: number
        '@Number':
          type: integer
      required:
      - '@Number'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Segment
    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
    HbEnergyOffer:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        MaskedParticipantId:
          type: integer
        MaskedAssetId:
          type: integer
        MustTakeEnergy:
          type: integer
        MaxDailyEnergy:
          type: number
        EconomicMax:
          type: number
        EconomicMin:
          type: number
        ColdStartPrice:
          type: number
        IntermediateStartPrice:
          type: number
        HotStartPrice:
          type: number
        NoLoadPrice:
          type: number
        Segments:
          $ref: '#/components/schemas/Segments'
        Claim10Mw:
          type: number
        Claim30Mw:
          type: number
        UnitStatus:
          type: string
          enum:
          - MUST_RUN
          - ECONOMIC
          - UNAVAILABLE
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HbEnergyOffer
    HbDayAheadEnergyOffers:
      type: object
      properties:
        HbDayAheadEnergyOffer:
          type: array
          items:
            $ref: '#/components/schemas/HbEnergyOffer'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HbDayAheadEnergyOffers
  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