openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Hourlysysload 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: hourlysysload
  description: 8 path template(s) under /hourlysysload in the published ISO New England Web Services API v1.1 documentation.
paths:
  /hourlysysload:
    get:
      operationId: getHourlysysload
      summary: Default resource
      description: Default resource. Redirects to Load Forecast Info .
      tags:
      - hourlysysload
      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.hourlysysload.html
        harvested: '2026-07-27'
  /hourlysysload/current:
    get:
      operationId: getHourlysysloadCurrent
      summary: 'Get the current Hourly System Load '
      description: Get the current Hourly System Load .
      tags:
      - hourlysysload
      responses:
        '200':
          description: a HourlySystemLoadsElement containing the current Hourly System Loads.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
        '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.hourlysysload.current.html
        harvested: '2026-07-27'
      x-xml-element: HourlySystemLoads
  /hourlysysload/current/location/{locationId}:
    get:
      operationId: getHourlysysloadCurrentLocationByLocationId
      summary: Get the current Hourly System Load for a given location
      description: Get the current Hourly System Load for a given location.
      tags:
      - hourlysysload
      responses:
        '200':
          description: a HourlySystemLoadElement containing the current Hourly System Load for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlySystemLoad'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlySystemLoad'
        '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.hourlysysload.current.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: HourlySystemLoad
      parameters:
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /hourlysysload/current/locationType/{locationType}:
    get:
      operationId: getHourlysysloadCurrentLocationTypeByLocationType
      summary: Get the current Hourly System Load for a given location type
      description: Get the current Hourly System Load for a given location type.
      tags:
      - hourlysysload
      responses:
        '200':
          description: a HourlySystemLoadsElement containing the current Hourly System Loads for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
        '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.hourlysysload.current.locationType.locationType.html
        harvested: '2026-07-27'
      x-xml-element: HourlySystemLoads
      parameters:
      - name: locationType
        in: path
        required: true
        schema:
          type: string
        description: The locationType
  /hourlysysload/day/{day}:
    get:
      operationId: getHourlysysloadDayByDay
      summary: Get the current RT Hourly Sysload for a given Date
      description: Get the current RT Hourly Sysload for a given Date.
      tags:
      - hourlysysload
      responses:
        '200':
          description: a HourlyLmpsElement containing the current RT Hourly Sysload for the given date .
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
        '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.hourlysysload.day.day.html
        harvested: '2026-07-27'
      x-xml-element: HourlySystemLoads
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /hourlysysload/day/{day}/hour/{sh}:
    get:
      operationId: getHourlysysloadDayByDayHourBySh
      summary: GET /hourlysysload/day/{day}/hour/{sh}
      description: (no documentation provided)
      tags:
      - hourlysysload
      responses:
        '200':
          description: Successful response.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
        '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.hourlysysload.day.day.hour.sh.html
        harvested: '2026-07-27'
      x-xml-element: HourlySystemLoads
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
      - name: sh
        in: path
        required: true
        schema:
          type: string
  /hourlysysload/day/{day}/location/{locationId}:
    get:
      operationId: getHourlysysloadDayByDayLocationByLocationId
      summary: Get an entire days Hourly System Load forgiven location
      description: Get an entire days Hourly System Load forgiven location. Only the past [?] days are supported.
      tags:
      - hourlysysload
      responses:
        '200':
          description: a HourlySystemLoadsElement containing the Hourly System Loads.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlySystemLoads'
        '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.hourlysysload.day.day.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: HourlySystemLoads
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /hourlysysload/info:
    get:
      operationId: getHourlysysloadInfo
      summary: Get the Service Info for Hourly Sys Load
      description: Get the Service Info for Hourly Sys Load.
      tags:
      - hourlysysload
      responses:
        '200':
          description: the ServiceInfoElement for Hourly Sys 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.hourlysysload.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
components:
  schemas:
    HourlySystemLoad:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        Location:
          $ref: '#/components/schemas/LocationRef'
        Load:
          type: number
        NativeLoad:
          type: number
        ArdDemand:
          type: number
      required:
      - BeginDate
      - Location
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HourlySystemLoad
    LocationRef:
      type: object
      properties:
        $:
          type: string
          description: Element text value (serialized as "$" in the JSON representation, per observed API responses).
        '@LocId':
          type: integer
        '@LocType':
          type: string
          enum:
          - NETWORK AREA
          - LOAD ZONE
          - NETWORK NODE
          - HUB
          - HUB NODE
          - RELIABILITY REGION
          - EXT. NODE
          - RESERVE ZONE
          - SYSTEM
          - INT. AREA
          - EXT. AREA
          - DISPATCH ZONE
          - CAPACITY ZONE
          - DRRAZ
          - DRR AGGREGATION ZONE
      required:
      - '@LocId'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_LocationRef
    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
    HourlySystemLoads:
      type: object
      properties:
        HourlySystemLoad:
          type: array
          items:
            $ref: '#/components/schemas/HourlySystemLoad'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HourlySystemLoads
  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