ISO New England Sevendayforecast API

openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Sevendayforecast 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: sevendayforecast
  description: 5 path template(s) under /sevendayforecast in the published ISO New England Web Services API v1.1 documentation.
paths:
  /sevendayforecast:
    get:
      operationId: getSevendayforecast
      summary: Default resource
      description: Default resource. Redirects to SDF.
      tags:
      - sevendayforecast
      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.sevendayforecast.html
        harvested: '2026-07-27'
  /sevendayforecast/current:
    get:
      operationId: getSevendayforecastCurrent
      summary: Get the current SDF
      description: Get the current SDF.
      tags:
      - sevendayforecast
      responses:
        '200':
          description: a SevenDayForecastsElement containing the current SDFs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/SevenDayForecasts'
            application/json:
              schema:
                $ref: '#/components/schemas/SevenDayForecasts'
              example:
                SevenDayForecasts:
                  SevenDayForecast:
                  - CreationDate: '2026-07-27T09:14:58.000-04:00'
                    MarketDay:
                    - OtherGenOutagesMw: 1786
                      DelistMw: 971
                      MarketDate: '2026-07-28T00:00:00.000-04:00'
                      TotAvailGenImportMw: 29332
                      ColdWeatherWarn: N
                      PowerWatch: N
                      CsoMw: 26707
                      ColdWeatherWatch: N
                      Weather:
                        CityWeather:
                        - HighTempF: 78
                          DewPointF: 66
                          CityName: Boston
                        - HighTempF: 77
                          DewPointF: 69
                          CityName: Hartford
                      ColdWeatherEvent: N
                      ReplReserveReqMw: 160
                      PeakImportMw: 3440
                      PeakLoadMw: 17630
                      ReqdReserveMw: 2048
                      ReqdReserveInclReplMw: 2208
                      PowerWarn: N
                      TotLoadPlusReqdReserveMw: 19838
                      SurplusDeficiencyMw: 9494
                      DrrMw: 245
                      Day: 2
                      TotAvailGenMw: 25892
                      ColdWeatherOutagesMw: 0
                    - OtherGenOutagesMw: 2232
                      DelistMw: 971
                      MarketDate: '2026-07-29T00:00:00.000-04:00'
                      TotAvailGenImportMw: 28886
                      ColdWeatherWarn: N
                      PowerWatch: N
                      CsoMw: 26707
                      ColdWeatherWatch: N
                      Weather:
                        CityWeather:
                        - HighTempF: 69
                          DewPointF: 65
                          CityName: Boston
                        - HighTempF: 73
                          DewPointF: 68
                          CityName: Hartford
                      ColdWeatherEvent: N
                      ReplReserveReqMw: 160
                      PeakImportMw: 3440
                      PeakLoadMw: 16390
                      ReqdReserveMw: 2048
                      ReqdReserveInclReplMw: 2208
                      PowerWarn: N
                      TotLoadPlusReqdReserveMw: 18598
                      SurplusDeficiencyMw: 10288
                      DrrMw: 245
                      Day: 3
                      TotAvailGenMw: 25446
                      ColdWeatherOutagesMw: 0
                    - OtherGenOutagesMw: 2397
                      DelistMw: 971
                      MarketDate: '2026-07-30T00:00:00.000-04:00'
                      TotAvailGenImportMw: 28721
                      ColdWeatherWarn: '-'
                      PowerWatch: N
                      CsoMw: 26707
                      ColdWeatherWatch: '-'
                      Weather:
                        CityWeather:
                        - HighTempF: 69
                          DewPointF: 65
                          CityName: Boston
                        - HighTempF: 74
                          DewPointF: 64
                          CityName: Hartford
                      ColdWeatherEvent: '-'
                      ReplReserveReqMw: 160
                      PeakImportMw: 3440
                      PeakLoadMw: 16160
                      ReqdReserveMw: 2048
                      ReqdReserveInclReplMw: 2208
                      PowerWarn: N
                      TotLoadPlusReqdReserveMw: 18368
                      SurplusDeficiencyMw: 10353
                      DrrMw: 245
                      Day: 4
                      TotAvailGenMw: 25281
                      ColdWeatherOutagesMw: 0
                    - OtherGenOutagesMw: 2506
                      DelistMw: 971
                      MarketDate: '2026-07-31T00:00:00.000-04:00'
                      TotAvailGenImportMw: 28942
                      ColdWeatherWarn: '-'
                      PowerWatch: N
                      CsoMw: 26707
                      ColdWeatherWatch: '-'
                      Weather:
                        CityWeather:
                        - HighTempF: 74
                          DewPointF: 63
                          CityName: Boston
                        - HighTempF: 80
                          DewPointF: 64
                          CityName: Hartford
                      ColdWeatherEvent: '-'
                      ReplReserveReqMw: 160
                      PeakImportMw: 3770
                      PeakLoadMw: 16920
                      ReqdReserveMw: 2048
                      ReqdReserveInclReplMw: 2208
                      PowerWarn: N
                      TotLoadPlusReqdReserveMw: 19128
                      SurplusDeficiencyMw: 9814
                      DrrMw: 245
                      Day: 5
                      TotAvailGenMw: 25172
                      ColdWeatherOutagesMw: 0
                    - OtherGenOutagesMw: 2560
                      DelistMw: 971
                      MarketDate: '2026-08-01T00:00:00.000-04:00'
                      TotAvailGenImportMw: 29135
                      ColdWeatherWarn: '-'
                      PowerWatch: N
                      CsoMw: 26754
                      ColdWeatherWatch: '-'
                      Weather:
                        CityWeather:
                        - HighTempF: 78
                          DewPointF: 64
                          CityName: Boston
                        - HighTempF: 83
                          DewPointF: 65
                          CityName: Hartford
                      ColdWeatherEvent: '-'
                      ReplReserveReqMw: 160
                      PeakImportMw: 3970
                      PeakLoadMw: 17330
                      ReqdReserveMw: 2048
                      ReqdReserveInclReplMw: 2208
                      PowerWarn: N
                      TotLoadPlusReqdReserveMw: 19538
                      SurplusDeficiencyMw: 9597
                      DrrMw: 245
                      Day: 6
                      TotAvailGenMw: 25165
                      ColdWeatherOutagesMw: 0
                    - OtherGenOutagesMw: 2710
                      DelistMw: 971
                      MarketDate: '2026-08-02T00:00:00.000-04:00'
                      TotAvailGenImportMw: 28985
                      ColdWeatherWarn: '-'
                      PowerWatch: N
                      CsoMw: 26754
                      ColdWeatherWatch: '-'
                      Weather:
                        CityWeather:
                        - HighTempF: 81
                          DewPointF: 66
                          CityName: Boston
                        - HighTempF: 82
                          DewPointF: 67
                          CityName: Hartford
                      ColdWeatherEvent: '-'
                      ReplReserveReqMw: 160
                      PeakImportMw: 3970
                      PeakLoadMw: 18090
                      ReqdReserveMw: 2048
                      ReqdReserveInclReplMw: 2208
                      PowerWarn: N
                      TotLoadPlusReqdReserveMw: 20298
                      SurplusDeficiencyMw: 8687
                      DrrMw: 245
                      Day: 7
                      TotAvailGenMw: 25015
                      ColdWeatherOutagesMw: 0
                    BeginDate: '2026-07-28T00:00:00.000-04:00'
        '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.sevendayforecast.current.html
        harvested: '2026-07-27'
      x-xml-element: SevenDayForecasts
      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.
  /sevendayforecast/day/{day}:
    get:
      operationId: getSevendayforecastDayByDay
      summary: Get most recent Day SDFs
      description: Get most recent Day SDFs.
      tags:
      - sevendayforecast
      responses:
        '200':
          description: a SevenDayForecastsElement containing the SDFs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/SevenDayForecasts'
            application/json:
              schema:
                $ref: '#/components/schemas/SevenDayForecasts'
        '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.sevendayforecast.day.day.html
        harvested: '2026-07-27'
      x-xml-element: SevenDayForecasts
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: Retrieve data for the day in(YYYYMMDD)
  /sevendayforecast/day/{day}/all:
    get:
      operationId: getSevendayforecastDayByDayAll
      summary: Get entire Day SDFs
      description: Get entire Day SDFs.
      tags:
      - sevendayforecast
      responses:
        '200':
          description: a SevenDayForecastsElement containing the SDFs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/SevenDayForecasts'
            application/json:
              schema:
                $ref: '#/components/schemas/SevenDayForecasts'
        '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.sevendayforecast.day.day.all.html
        harvested: '2026-07-27'
      x-xml-element: SevenDayForecasts
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: Retrieve data for the day in(YYYYMMDD)
  /sevendayforecast/info:
    get:
      operationId: getSevendayforecastInfo
      summary: Get the Service Info for SDF
      description: Get the Service Info for SDF.
      tags:
      - sevendayforecast
      responses:
        '200':
          description: the ServiceInfoElement for TTC.
          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.sevendayforecast.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
components:
  schemas:
    Weather:
      type: object
      properties:
        CityWeather:
          type: array
          items:
            $ref: '#/components/schemas/CityWeather'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Weather
    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
    MarketDay:
      type: object
      properties:
        MarketDate:
          type: string
          format: date-time
        CsoMw:
          type: number
        ColdWeatherOutagesMw:
          type: number
        OtherGenOutagesMw:
          type: number
        DelistMw:
          type: number
        TotAvailGenMw:
          type: number
        PeakImportMw:
          type: number
        TotAvailGenImportMw:
          type: number
        PeakLoadMw:
          type: number
        ReplReserveReqMw:
          type: number
        ReqdReserveMw:
          type: number
        ReqdReserveInclReplMw:
          type: number
        TotLoadPlusReqdReserveMw:
          type: number
        DrrMw:
          type: number
        SurplusDeficiencyMw:
          type: number
        RtegMw:
          type: number
        PowerWatch:
          type: string
          enum:
          - Y
          - N
          - '-'
        PowerWarn:
          type: string
          enum:
          - Y
          - N
          - '-'
        ColdWeatherWatch:
          type: string
          enum:
          - Y
          - N
          - '-'
        ColdWeatherWarn:
          type: string
          enum:
          - Y
          - N
          - '-'
        ColdWeatherEvent:
          type: string
          enum:
          - Y
          - N
          - '-'
        EnergyEmergency:
          type: string
          enum:
          - Y
          - N
          - '-'
        Weather:
          $ref: '#/components/schemas/Weather'
        '@Day':
          type: integer
      required:
      - MarketDate
      - CsoMw
      - ColdWeatherOutagesMw
      - OtherGenOutagesMw
      - DelistMw
      - TotAvailGenMw
      - PeakImportMw
      - TotAvailGenImportMw
      - PeakLoadMw
      - ReplReserveReqMw
      - ReqdReserveMw
      - ReqdReserveInclReplMw
      - TotLoadPlusReqdReserveMw
      - DrrMw
      - SurplusDeficiencyMw
      - RtegMw
      - PowerWatch
      - PowerWarn
      - ColdWeatherWatch
      - ColdWeatherWarn
      - ColdWeatherEvent
      - EnergyEmergency
      - Weather
      - '@Day'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_MarketDay
    CityWeather:
      type: object
      properties:
        CityName:
          type: string
        HighTempF:
          type: integer
        DewPointF:
          type: integer
      required:
      - CityName
      - HighTempF
      - DewPointF
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_CityWeather
    SevenDayForecasts:
      type: object
      properties:
        SevenDayForecast:
          type: array
          items:
            $ref: '#/components/schemas/SevenDayForecast'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_SevenDayForecasts
    SevenDayForecast:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        MarketDay:
          type: array
          items:
            $ref: '#/components/schemas/MarketDay'
        CreationDate:
          type: string
          format: date-time
      required:
      - BeginDate
      - CreationDate
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_SevenDayForecast
  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