ISO New England Fiveminutesystemload API

openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Fiveminutesystemload 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: fiveminutesystemload
  description: 4 path template(s) under /fiveminutesystemload in the published ISO New England Web Services API v1.1 documentation.
paths:
  /fiveminutesystemload:
    get:
      operationId: getFiveminutesystemload
      summary: Default resource
      description: Default resource. Redirects to Five Minute System Load Info.
      tags:
      - fiveminutesystemload
      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.fiveminutesystemload.html
        harvested: '2026-07-27'
  /fiveminutesystemload/current:
    get:
      operationId: getFiveminutesystemloadCurrent
      summary: Get the current Five Minute System Load for all locations
      description: Get the current Five Minute System Load for all locations.
      tags:
      - fiveminutesystemload
      responses:
        '200':
          description: a FiveMinSystemLoadElement containing the current Five Minute System Load.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinSystemLoad'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinSystemLoad'
              example:
                FiveMinSystemLoad:
                - SystemLoadBtmPv: 19358.383
                  NativeLoadBtmPv: 19330.783
                  NativeLoad: 17004.273
                  LoadMw: 17031.873
                  BeginDate: '2026-07-27T17:20:00.000-04:00'
                  ArdDemand: 27.6
        '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.fiveminutesystemload.current.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinSystemLoad
      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.
  /fiveminutesystemload/day/{day}:
    get:
      operationId: getFiveminutesystemloadDayByDay
      summary: Get an entire days Five Minute System Loads for a given day
      description: Get an entire days Five Minute System Loads for a given day. Only the past [?] days are supported.
      tags:
      - fiveminutesystemload
      responses:
        '200':
          description: a FiveMinSystemLoadElement containing the Five Minute System loads.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinSystemLoads'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinSystemLoads'
        '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.fiveminutesystemload.day.day.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinSystemLoads
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /fiveminutesystemload/info:
    get:
      operationId: getFiveminutesystemloadInfo
      summary: Get the Service Info for Five Minute System Load
      description: Get the Service Info for Five Minute System Load.
      tags:
      - fiveminutesystemload
      responses:
        '200':
          description: the ServiceInfoElement for Five Minute System Load.
          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.fiveminutesystemload.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
components:
  schemas:
    FiveMinSystemLoad:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        LoadMw:
          type: number
        NativeLoad:
          type: number
        ArdDemand:
          type: number
        SystemLoadBtmPv:
          type: number
        NativeLoadBtmPv:
          type: number
      required:
      - BeginDate
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinSystemLoad
    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
    FiveMinSystemLoads:
      type: object
      properties:
        FiveMinSystemLoad:
          type: array
          items:
            $ref: '#/components/schemas/FiveMinSystemLoad'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinSystemLoads
  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