openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Hourlyper 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: hourlyper
  description: 5 path template(s) under /hourlyper in the published ISO New England Web Services API v1.1 documentation.
paths:
  /hourlyper:
    get:
      operationId: getHourlyper
      summary: Default resource
      description: Default resource. Redirects to HourlyPER Info.
      tags:
      - hourlyper
      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.hourlyper.html
        harvested: '2026-07-27'
  /hourlyper/current:
    get:
      operationId: getHourlyperCurrent
      summary: Get the current HourlyPER
      description: Get the current HourlyPER.
      tags:
      - hourlyper
      responses:
        '200':
          description: a HourlyPERElement containing the current HourlyPER.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlyPeakEnergyRents'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlyPeakEnergyRents'
        '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.hourlyper.current.html
        harvested: '2026-07-27'
      x-xml-element: HourlyPeakEnergyRents
  /hourlyper/info:
    get:
      operationId: getHourlyperInfo
      summary: Get the Service Info for HourlyPER
      description: Get the Service Info for HourlyPER.
      tags:
      - hourlyper
      responses:
        '200':
          description: the ServiceInfoElement for HourlyPER.
          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.hourlyper.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
  /hourlyper/month/{month}:
    get:
      operationId: getHourlyperMonthByMonth
      summary: Get an entire months HourlyPERs
      description: Get an entire months HourlyPERs.Only the past 30 days
      tags:
      - hourlyper
      responses:
        '200':
          description: a HourlyPERsElement containing the HourlyPERs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlyPeakEnergyRents'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlyPeakEnergyRents'
        '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.hourlyper.month.month.html
        harvested: '2026-07-27'
      x-xml-element: HourlyPeakEnergyRents
      parameters:
      - name: month
        in: path
        required: true
        schema:
          type: string
        description: The month to retrieve data for (YYYYMM)
  /hourlyper/month/{month}/capacityZone/{capacityZoneId}:
    get:
      operationId: getHourlyperMonthByMonthCapacityZoneByCapacityZoneId
      summary: Get an entire months HourlyPERs
      description: Get an entire months HourlyPERs.Only the past 30 days
      tags:
      - hourlyper
      responses:
        '200':
          description: a HourlyPERsElement containing the HourlyPERs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HourlyPeakEnergyRents'
            application/json:
              schema:
                $ref: '#/components/schemas/HourlyPeakEnergyRents'
        '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.hourlyper.month.month.capacityZone.capacityZoneId.html
        harvested: '2026-07-27'
      x-xml-element: HourlyPeakEnergyRents
      parameters:
      - name: month
        in: path
        required: true
        schema:
          type: string
        description: The month to retrieve data for (YYYYMM)
      - name: capacityZoneId
        in: path
        required: true
        schema:
          type: string
components:
  schemas:
    HourlyPeakEnergyRent:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        Location:
          $ref: '#/components/schemas/CapacityRef'
        RTLMPLocation:
          type: string
        RTLMP:
          type: number
        PERFuelType:
          type: string
        StrikePrice:
          type: number
        SystemLoad:
          type: number
        ScaleFactor:
          type: number
        HourlyPER:
          type: number
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HourlyPeakEnergyRent
    CapacityRef:
      type: object
      properties:
        $:
          type: string
          description: Element text value (serialized as "$" in the JSON representation, per observed API responses).
        '@CapacityZoneId':
          type: integer
      required:
      - '@CapacityZoneId'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_CapacityRef
    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
    HourlyPeakEnergyRents:
      type: object
      properties:
        HourlyPeakEnergyRent:
          type: array
          items:
            $ref: '#/components/schemas/HourlyPeakEnergyRent'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HourlyPeakEnergyRents
  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