ISO New England Hourlyloadforecast API

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