PJM Interconnection is the regional transmission organization (RTO) that operates the largest competitive wholesale electricity market in the United States, coordinating the movement of electricity across all or parts of Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and the District of Columbia for roughly 67 million people. PJM sits at the wholesale layer of the energy value chain — it has no retail customers, so no Green Button, ESPI or consumer data-sharing obligation applies to it. Its API posture is honestly "rich data, universally gated": PJM publishes a large machine-readable market data catalogue through the Data Miner 2 API at https://api.pjm.com/api/v1 and an Azure API Management developer portal at https://apiportal.pjm.com, but every feed returns HTTP 401 anonymously and a free subscription key is only issued after a PJM Tools account is registered and approved by a Customer Account Manager. Its one genuinely mandated interface is the FERC Order 889 / NAESB WEQ OASIS node, which is verifiably live and standards-conformant at https://pjmoasis.pjm.com, though template submission also requires an authenticated PJM SSO session. One genuinely anonymous PJM REST API does exist and is easy to miss: the Messages public web service at https://messages.pjm.com/messages/rest/public/messages, linked as "Web Service" from the Upcoming Changes page, returns the planned-outage and impact notices for the whole PJM tool estate with no credential, in XML or JSON.
PJM Interconnection publishes 6 APIs on the APIs.io network. Tagged areas include Energy, United States, Energy Markets, Electricity, and Grid.
PJM Interconnection’s developer surface includes documentation, signup flow, authentication, engineering blog, support, legal docs, API reference, and 36 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Energy & Utilities regime, so
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The six quality facets above are damped to 85 points between them,
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maximum: raising a quality facet moves the composite by 85% of its nominal
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PJM's public wholesale market and system data catalogue, exposed as a REST API behind Azure API Management. Feeds include day-ahead and real-time hourly and five-minute LMPs, an...
The only fully anonymous PJM REST API found on the public surface. It backs the PJM Upcoming Changes page and returns the current planned-outage, delayed-data and impact notices...
PJM's Open Access Same-Time Information System (OASIS) node, the FERC Order 889 obligation implemented against the NAESB Wholesale Electric Quadrant business practice standards....
The REST authentication front door for every browserless/API integration with PJM eTools. A client POSTs to the PJM single sign-on service with X-OpenAM-Username and X-OpenAM-Pa...
The browserless REST interface to PJM InSchedule, the eTool market participants use to submit and retrieve bilateral internal energy transaction schedules and contracts. PJM's b...
The browserless XML-over-HTTP interface to eDART, PJM's Dispatcher Applications and Reporting Tool, used by transmission owners and generation owners to file and query transmiss...
aid: pjm
url: https://raw.githubusercontent.com/api-evangelist/pjm/refs/heads/main/apis.yml
name: PJM Interconnection
kind: company
description: 'PJM Interconnection is the regional transmission organization (RTO) that operates the largest competitive wholesale
electricity market in the United States, coordinating the movement of electricity across all or parts of Delaware, Illinois,
Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia
and the District of Columbia for roughly 67 million people. PJM sits at the wholesale layer of the energy value chain —
it has no retail customers, so no Green Button, ESPI or consumer data-sharing obligation applies to it. Its API posture
is honestly "rich data, universally gated": PJM publishes a large machine-readable market data catalogue through the Data
Miner 2 API at https://api.pjm.com/api/v1 and an Azure API Management developer portal at https://apiportal.pjm.com, but
every feed returns HTTP 401 anonymously and a free subscription key is only issued after a PJM Tools account is registered
and approved by a Customer Account Manager. Its one genuinely mandated interface is the FERC Order 889 / NAESB WEQ OASIS
node, which is verifiably live and standards-conformant at https://pjmoasis.pjm.com, though template submission also requires
an authenticated PJM SSO session. One genuinely anonymous PJM REST API does exist and is easy to miss: the Messages public
web service at https://messages.pjm.com/messages/rest/public/messages, linked as "Web Service" from the Upcoming Changes
page, returns the planned-outage and impact notices for the whole PJM tool estate with no credential, in XML or JSON.'
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Energy
- United States
- Energy Markets
- Electricity
- Grid
- System Operator
- Wholesale Electricity
- Transmission
- Market Data
- Demand Response
created: '2026-07-27'
modified: '2026-07-27'
specificationVersion: '0.23'
apis:
- aid: pjm:pjm-data-miner-2-api
name: PJM Data Miner 2 API
description: PJM's public wholesale market and system data catalogue, exposed as a REST API behind Azure API Management.
Feeds include day-ahead and real-time hourly and five-minute LMPs, ancillary service prices and market results, generation
by fuel type, hourly metered/estimated/preliminary load, load forecasts, generation and transmission outages, FTR auction
bids and zonal LMPs, pnode and aggregate definitions, and uplift and billing determinants. Each feed supports a /metadata
call and a search call with rowCount/startRow paging, field selection, sorting and date-range filters, and JSON or CSV
output. The data is designated public by PJM and the key is free, but anonymous calls are rejected — verified HTTP 401
on GET https://api.pjm.com/api/v1/gen_by_fuel on 2026-07-27 — and redistribution requires at minimum a PJM Associate Membership.
humanURL: https://www.pjm.com/markets-and-operations/etools/data-miner-2
baseURL: https://api.pjm.com/api/v1
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Market Data
- Electricity
- Energy Markets
- Locational Marginal Pricing
- Load
- Outages
properties:
- type: Documentation
url: https://www.pjm.com/markets-and-operations/etools/data-miner-2
- type: APIPortal
url: https://apiportal.pjm.com/
- type: Guide
url: https://www.pjm.com/-/media/DotCom/etools/data-miner-2/data-miner-2-api-guide.ashx
- type: SwaggerUI
url: https://services.pjm.com/PJMDataminerApi/swagger
- type: Console
url: https://dataminer2.pjm.com/list
- type: SignUp
url: https://accountmanager.pjm.com/accountmanager/pages/public/new-user.jsf
- type: APIReference
url: https://www.pjm.com/-/media/DotCom/etools/data-miner-2/data-miner-2-api-guide.ashx
- type: GettingStarted
url: https://www.pjm.com/-/media/DotCom/etools/data-miner-2/data-miner-2-getting-started-guide.pdf
- type: ChangeLog
url: https://www.pjm.com/markets-and-operations/etools/data-miner-2/data-miner-2-release-notes.aspx
- type: FAQ
url: https://learn.pjm.com/three-priorities/keeping-the-lights-on/data-miner-faqs.aspx
- type: RateLimits
url: rate-limits/pjm-rate-limits.yml
- type: Conventions
url: conventions/pjm-conventions.yml
- type: ErrorCatalog
url: errors/pjm-error-catalog.yml
- type: DataModel
url: data-model/pjm-data-model.yml
- type: Sandbox
url: https://api-train.pjm.com/api/v1
- type: AgentSkill
url: skills/pjm-query-data-miner-feed.md
- aid: pjm:pjm-messages-public-api
name: PJM Messages Public Web Service
description: 'The only fully anonymous PJM REST API found on the public surface. It backs the PJM Upcoming Changes page
and returns the current planned-outage, delayed-data and impact notices for the whole PJM eTools estate — affected applications
by name and numeric id, the change window as epoch milliseconds, required actions, and an access-blocking flag. GET https://messages.pjm.com/messages/rest/public/messages
returned HTTP 200 with no credential on 2026-07-27, serving application/xml;charset=UTF-8 by default and JSON under Accept:
application/json. There are no documented query parameters, no paging and no filtering — it returns the current notice
set as one small document. It is poll-only; PJM registers no webhooks, and the alternative subscription channel is email.'
humanURL: https://www.pjm.com/markets-and-operations/etools/upcoming-changes
baseURL: https://messages.pjm.com/messages/rest/public
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Status
- Notification
- Planned Outages
- Grid Operations
- Open Access
tags_raw:
- Status
- Notifications
- Planned Outages
- Grid Operations
- Open Access
properties:
- type: Documentation
url: https://www.pjm.com/markets-and-operations/etools/upcoming-changes
- type: Guide
url: https://www.pjm.com/-/media/etools/upcoming-changes-how-to-guide.pdf
- type: JSONSchema
url: json-schema/pjm-message.json
- type: Examples
url: examples/_index.yml
- type: AgentSkill
url: skills/pjm-watch-tool-change-notices.md
- type: StatusPage
url: https://www.pjm.com/markets-and-operations/etools/upcoming-changes
- aid: pjm:pjm-oasis-template-api
name: PJM OASIS Template API
description: PJM's Open Access Same-Time Information System (OASIS) node, the FERC Order 889 obligation implemented against
the NAESB Wholesale Electric Quadrant business practice standards. PJM states support for NAESB WEQ-002 (Standards and
Communication Protocol) and WEQ-003 (Data Dictionary) versions 2.0, 2.1, 2.2 and 3.3, accepting query/response and input/response
templates over HTTP GET (Content-type text/plain) and POST (application/x-www-form-urlencoded) against the template base
URL, plus three PJM custom templates (pjmannulment, pjmtransreq, pjmtsrcomment). The NAESB WEQ-002-4.5.2 public information
page at https://pjmoasis.pjm.com/OASIS/PJM/INFO.HTM is served anonymously (verified HTTP 200 on 2026-07-27); template
submission itself requires a PJM SSO session token or the PJM Command Line Interface tool.
humanURL: https://www.pjm.com/markets-and-operations/etools/oasis.aspx
baseURL: https://pjmoasis.pjm.com/OASIS/PJM/data/
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- OASIS
- Transmission
- NAESB
- FERC Order 889
- Available Transfer Capability
properties:
- type: Documentation
url: https://www.pjm.com/markets-and-operations/etools/oasis.aspx
- type: Guide
url: https://www.pjm.com/-/media/DotCom/etools/oasis/pjm-oasis-api-user-guide.pdf
- type: PublicInformation
url: https://pjmoasis.pjm.com/OASIS/PJM/INFO.HTM
- type: Sandbox
url: https://oasistrain.pjm.com/
- type: CLI
url: https://www.pjm.com/-/media/DotCom/etools/pjm-command-line-interface-java-11.zip
- type: Standard
url: https://www.naesb.org/weq/default.asp
- type: Conformance
url: conformance/pjm-conformance.yml
- aid: pjm:pjm-browserless-authentication-api
name: PJM Browserless Authentication API
description: The REST authentication front door for every browserless/API integration with PJM eTools. A client POSTs to
the PJM single sign-on service with X-OpenAM-Username and X-OpenAM-Password headers and receives a JSON tokenId, which
is then presented as a pjmauth cookie on subsequent tool API calls, and released via a logout call. PJM has additionally
moved custom-code REST clients onto PKI, requiring a two-way TLS client certificate against the access/authenticate/pjmauthcert
endpoint alongside credentials. The service is ForgeRock OpenAM — verified live with HTTP 405 on GET https://sso.pjm.com/access/authenticate/
on 2026-07-27, confirming the documented POST-only endpoint.
humanURL: https://www.pjm.com/markets-and-operations/etools/security.aspx
baseURL: https://sso.pjm.com/access
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Authentication
- Single Sign-On
- Security
- PKI
properties:
- type: Guide
url: https://www.pjm.com/-/media/DotCom/etools/pjm-browserless-authentication-guide.pdf
- type: Documentation
url: https://www.pjm.com/markets-and-operations/etools/security.aspx
- type: Guide
url: https://www.pjm.com/-/media/DotCom/etools/security/pki-authentication-guide.pdf
- type: Sandbox
url: https://ssotrain.pjm.com/
- type: Authentication
url: authentication/pjm-authentication.yml
- type: AgentSkill
url: skills/pjm-authenticate-browserless-etools.md
- aid: pjm:pjm-inschedule-api
name: PJM InSchedule Browserless API
description: The browserless REST interface to PJM InSchedule, the eTool market participants use to submit and retrieve
bilateral internal energy transaction schedules and contracts. PJM's browserless authentication guide documents CSV file
upload under /inschedule/rest/secure/upload/file/{filename} and CSV retrieval under /inschedule/rest/secure/download/csv/contracts
with start and stop date parameters, both authenticated with a pjmauth session cookie. Anonymous access is refused — an
unauthenticated GET of the documented contracts endpoint on 2026-07-27 returned the ForgeRock OpenAM sign-in page rather
than data. This is a member/participant surface, not an open data API.
humanURL: https://www.pjm.com/markets-and-operations/etools/inschedule.aspx
baseURL: https://insched.pjm.com/inschedule/rest
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Scheduling
- Bilateral Transactions
- Energy Markets
- Members Only
properties:
- type: Guide
url: https://www.pjm.com/-/media/DotCom/etools/pjm-browserless-authentication-guide.pdf
- type: Sandbox
url: https://inschedtrain.pjm.com/
- type: Documentation
url: https://www.pjm.com/markets-and-operations/etools/inschedule.aspx
- type: Authentication
url: authentication/pjm-authentication.yml
- aid: pjm:pjm-edart-api
name: PJM eDART Browserless API
description: The browserless XML-over-HTTP interface to eDART, PJM's Dispatcher Applications and Reporting Tool, used by
transmission owners and generation owners to file and query transmission and generator outage tickets, voltage schedules
and other reliability data. PJM publishes the XML document definitions for the general endpoints openly at https://www.pjm.com/pjmfiles/pub/etools/edart/xmldocs/xmldoc.html
(verified HTTP 200, ~482KB, on 2026-07-27), while the endpoints themselves sit behind PJM SSO and PKI at https://edartsso.pjm.com/edart/.
Documentation is public; the data is participant-only.
humanURL: https://www.pjm.com/markets-and-operations/etools/edart.aspx
baseURL: https://edartsso.pjm.com/edart/
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Outages
- Reliability
- Transmission
- XML
- Members Only
properties:
- type: Documentation
url: https://www.pjm.com/pjmfiles/pub/etools/edart/xmldocs/xmldoc.html
- type: Guide
url: https://www.pjm.com/-/media/DotCom/etools/edart/dart-browserless-user-guide.pdf
- type: Sandbox
url: https://edartssotrain.pjm.com/edartsso
- type: Vocabulary
url: https://www.pjm.com/pjmfiles/pub/etools/edart/xmldocs/xmldoc.html
common:
- type: VulnerabilityDisclosure
url: security/pjm-vulnerability-disclosure.yml
- type: DomainSecurity
url: security/pjm-domain-security.yml
- type: Website
url: https://www.pjm.com/
- type: APIPortal
url: https://apiportal.pjm.com/
- type: Documentation
url: https://www.pjm.com/markets-and-operations/etools
- type: SignUp
url: https://accountmanager.pjm.com/accountmanager/pages/public/new-user.jsf
- type: Authentication
url: https://www.pjm.com/-/media/DotCom/etools/pjm-browserless-authentication-guide.pdf
- type: Security
url: https://www.pjm.com/markets-and-operations/etools/security.aspx
- type: Blog
url: https://insidelines.pjm.com/
- type: Learning
url: https://learn.pjm.com/
- type: Support
url: https://pjm.my.site.com/publicknowledge/s/
- type: LinkedIn
url: https://www.linkedin.com/company/pjm-interconnection
- type: Legal
url: https://www.pjm.com/about-pjm/legal
- type: DeveloperPortal
url: https://apiportal.pjm.com/
- type: APIReference
url: https://www.pjm.com/-/media/DotCom/etools/data-miner-2/data-miner-2-api-guide.ashx
- type: GettingStarted
url: https://www.pjm.com/-/media/DotCom/etools/data-miner-2/data-miner-2-getting-started-guide.pdf
- type: FAQ
url: https://learn.pjm.com/three-priorities/keeping-the-lights-on/data-miner-faqs.aspx
- type: ChangeLog
url: https://www.pjm.com/markets-and-operations/etools/data-miner-2/data-miner-2-release-notes.aspx
- type: ChangeLog
name: PJM Data Miner 2 structured changelog
url: changelog/pjm-changelog.yml
- type: StatusPage
url: https://www.pjm.com/markets-and-operations/etools/upcoming-changes
- type: Deprecation
name: Data Miner feed retirement notices
url: https://www.pjm.com/markets-and-operations/etools/data-miner-2/data-miner-2-release-notes.aspx
- type: Roadmap
name: PJM Tech Change Forum
url: https://www.pjm.com/committees-and-groups/forums/tech-change-forum.aspx
- type: Lifecycle
url: lifecycle/pjm-lifecycle.yml
- type: Authentication
name: PJM authentication profile
url: authentication/pjm-authentication.yml
- type: Conventions
url: conventions/pjm-conventions.yml
- type: ErrorCatalog
url: errors/pjm-error-catalog.yml
- type: RateLimits
url: rate-limits/pjm-rate-limits.yml
- type: Sandbox
url: sandbox/pjm-sandbox.yml
- type: CLI
url: cli/pjm-cli.yml
- type: Packages
url: packages/pjm-packages.yml
- type: Conformance
url: conformance/pjm-conformance.yml
- type: DataModel
url: data-model/pjm-data-model.yml
- type: Vocabulary
url: vocabulary/pjm-vocabulary.yml
- type: Examples
url: examples/_index.yml
- type: JSONSchema
url: json-schema/pjm-message.json
- type: WellKnown
url: well-known/pjm-well-known.yml
- type: SecurityTxt
url: well-known/pjm-security.txt
- type: LLMsTxt
url: llms/pjm-llms.txt
- type: AgentSkill
url: skills/_index.yml
- type: Pricing
name: PJM membership enrollment (fees for commercial data rights)
url: https://www.pjm.com/about-pjm/member-services/membership-enrollment
- type: TermsOfService
url: https://www.pjm.com/about-pjm/legal
- type: PrivacyPolicy
url: https://www.pjm.com/-/media/DotCom/about-pjm/privacy-policy-and-notice.pdf
- type: Glossary
url: https://www.pjm.com/glossary
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
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