openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Performancescore 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: performancescore
  description: 4 path template(s) under /performancescore in the published ISO New England Web Services API v1.1 documentation.
paths:
  /performancescore/{Type}:
    get:
      operationId: getPerformancescoreByType
      summary: Default resource
      description: Default resource. Redirects to Performance Score.
      tags:
      - performancescore
      responses:
        '200':
          description: Successful response.
          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.performancescore.Type.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /performancescore/{Type}/current:
    get:
      operationId: getPerformancescoreByTypeCurrent
      summary: Get the current Performance Score
      description: Get the current Performance Score.
      tags:
      - performancescore
      responses:
        '200':
          description: a PerformanceScoresElement containing the current Performance Scores.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/PerformanceScores'
            application/json:
              schema:
                $ref: '#/components/schemas/PerformanceScores'
        '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.performancescore.Type.current.html
        harvested: '2026-07-27'
      x-xml-element: PerformanceScores
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /performancescore/{Type}/info:
    get:
      operationId: getPerformancescoreByTypeInfo
      summary: Get the Service Info for Performance Score
      description: Get the Service Info for Performance Score.
      tags:
      - performancescore
      responses:
        '200':
          description: the ServiceInfoElement for Performance Score.
          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.performancescore.Type.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /performancescore/{Type}/month/{month}:
    get:
      operationId: getPerformancescoreByTypeMonthByMonth
      summary: Get Performance Scores for a given month
      description: Get Performance Scores for a given month.
      tags:
      - performancescore
      responses:
        '200':
          description: a PerformanceScoresElement containing the Performance Scores.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/PerformanceScores'
            application/json:
              schema:
                $ref: '#/components/schemas/PerformanceScores'
        '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.performancescore.Type.month.month.html
        harvested: '2026-07-27'
      x-xml-element: PerformanceScores
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - name: month
        in: path
        required: true
        schema:
          type: string
        description: The month to retrieve data for (YYYYMM)
components:
  schemas:
    PerformanceScore:
      type: object
      properties:
        Type:
          type: string
          enum:
          - PRELIM
          - FINAL
        TradingDate:
          type: string
          format: date-time
        HourEnd:
          type: string
        Location:
          $ref: '#/components/schemas/LocationRef'
        CapacityScarcityConditionType:
          type: string
        ActualCapacityProvided:
          type: number
        RealTimeReserveDesignation:
          type: number
        Load:
          type: number
        ReserveRequirement:
          type: number
        CapacitySupplyObligation:
          type: number
        BalancingRatio:
          type: number
        TradingInterval:
          type: string
          format: date-time
      required:
      - TradingDate
      - HourEnd
      - Location
      - TradingInterval
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_PerformanceScore
    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
    PerformanceScores:
      type: object
      properties:
        PerformanceScore:
          type: array
          items:
            $ref: '#/components/schemas/PerformanceScore'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_PerformanceScores
    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
  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