openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Fifteenminutelmp 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: fifteenminutelmp
  description: 5 path template(s) under /fifteenminutelmp in the published ISO New England Web Services API v1.1 documentation.
paths:
  /fifteenminutelmp/{Type}:
    get:
      operationId: getFifteenminutelmpByType
      summary: Default resource
      description: Default resource. Redirects to Fifteen Minute Lmps(PRELIM/FINAL).
      tags:
      - fifteenminutelmp
      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.fifteenminutelmp.Type.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fifteenminutelmp/{Type}/current:
    get:
      operationId: getFifteenminutelmpByTypeCurrent
      summary: Get the current Fifteen Minute Lmp
      description: Get the current Fifteen Minute Lmp.
      tags:
      - fifteenminutelmp
      responses:
        '200':
          description: a FifteenMinLmpsElement containing the current Fifteen Minute Lmps(PRELIM/FINAL).
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FifteenMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FifteenMinLmps'
        '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.fifteenminutelmp.Type.current.html
        harvested: '2026-07-27'
      x-xml-element: FifteenMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fifteenminutelmp/{Type}/current/location/{locationId}:
    get:
      operationId: getFifteenminutelmpByTypeCurrentLocationByLocationId
      summary: Get the current Fifteen Minute LMPs for a given location
      description: Get the current Fifteen Minute LMPs for a given location.
      tags:
      - fifteenminutelmp
      responses:
        '200':
          description: a LmpElement containing the current Fifteen Minute LMP(PRELIM/FINAL) for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FifteenMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FifteenMinLmps'
        '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.fifteenminutelmp.Type.current.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: FifteenMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /fifteenminutelmp/{Type}/day/{day}/location/{locationId}:
    get:
      operationId: getFifteenminutelmpByTypeDayByDayLocationByLocationId
      summary: Get an entire days Fifteen Minute LMPs for a given location
      description: Get an entire days Fifteen Minute LMPs for a given location. Only the past [?] days are supported.
      tags:
      - fifteenminutelmp
      responses:
        '200':
          description: a FifteenMinuteLmpsElement containing the Fifteen Minute LMPs(PRELIM/FINAL).
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FifteenMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FifteenMinLmps'
        '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.fifteenminutelmp.Type.day.day.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: FifteenMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - 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
  /fifteenminutelmp/{Type}/info:
    get:
      operationId: getFifteenminutelmpByTypeInfo
      summary: Get the Service Info for Fifteen Minute Lmps(PRELIM/FINAL)
      description: Get the Service Info for Fifteen Minute Lmps(PRELIM/FINAL).
      tags:
      - fifteenminutelmp
      responses:
        '200':
          description: the ServiceInfoElement for Fifteen Minute Lmps(PRELIM/FINAL).
          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.fifteenminutelmp.Type.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
components:
  schemas:
    FifteenMinLmps:
      type: object
      properties:
        FifteenMinLmp:
          type: array
          items:
            $ref: '#/components/schemas/Lmp'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FifteenMinLmps
    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
    Lmp:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        Location:
          $ref: '#/components/schemas/LocationRef'
        LmpTotal:
          type: number
        EnergyComponent:
          type: number
        CongestionComponent:
          type: number
        LossComponent:
          type: number
      required:
      - BeginDate
      - Location
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Lmp
    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