New York Independent System Operator (NYISO)
The New York Independent System Operator (NYISO) is the not-for-profit FERC-jurisdictional entity that operates New York State's bulk electricity grid, administers the state's wholesale energy, capacity and ancillary-services markets, and performs long-term power system planning. Formed in 1999 out of the New York Power Pool, it sits squarely in the wholesale middle of the value chain - between generators, transmission owners and interconnectors on one side and the investor-owned utilities and retail suppliers who actually bill New York consumers on the other. NYISO's API posture is the sector's classic two-speed split, and NYISO lands hard on both ends of it. Market and system data is genuinely open - the MIS public archive at mis.nyiso.com/public serves roughly sixty machine-readable report families (day-ahead and real-time LBMP, actual and forecast load, real-time fuel mix, ATC/TTC, outages, constraints, interface flows, bid data, capacity, uplift, emissions) as daily CSV and monthly ZIP with no account, no key and no referrer check, and the FERC-mandated OASIS node publishes an anonymously listable object store of transmission postings. Consumer data is the exact opposite - there is none, and none is expected, because NYISO holds no retail customer relationships. Every real REST API NYISO documents - the Finance APIs (Metering, Settlements, Invoicing) and the Metering API under api.nyiso.com - is market-participant-only, gated behind an MIS user account plus a NAESB-accredited digital certificate, and every one of those endpoints answers 401 anonymously. The United States has no consumer energy data mandate behind Green Button, and in any case Green Button binds distribution utilities, not system operators, so NYISO carries no Green Button or Consumer Data Right obligation at all.
New York Independent System Operator (NYISO) publishes 6 APIs on the APIs.io network. Tagged areas include Energy, United States, Electricity, Energy Markets, and Grid.
New York Independent System Operator (NYISO)’s developer surface includes developer portal, documentation, legal docs, support, engineering blog, authentication, sandbox, and 14 more developer resources.
6 APIs
EnergyUnited StatesElectricityEnergy MarketsGridOpen DataSystem OperatorNew YorkRenewablesEmissions
Individual APIs this provider publishes, each with its own machine-readable definition.
Standalone JSON Schema definitions for this provider's data models.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
aid: nyiso
url: https://raw.githubusercontent.com/api-evangelist/nyiso/refs/heads/main/apis.yml
name: New York Independent System Operator (NYISO)
kind: company
description: The New York Independent System Operator (NYISO) is the not-for-profit FERC-jurisdictional entity that operates
New York State's bulk electricity grid, administers the state's wholesale energy, capacity and ancillary-services markets,
and performs long-term power system planning. Formed in 1999 out of the New York Power Pool, it sits squarely in the wholesale
middle of the value chain - between generators, transmission owners and interconnectors on one side and the investor-owned
utilities and retail suppliers who actually bill New York consumers on the other. NYISO's API posture is the sector's classic
two-speed split, and NYISO lands hard on both ends of it. Market and system data is genuinely open - the MIS public archive
at mis.nyiso.com/public serves roughly sixty machine-readable report families (day-ahead and real-time LBMP, actual and
forecast load, real-time fuel mix, ATC/TTC, outages, constraints, interface flows, bid data, capacity, uplift, emissions)
as daily CSV and monthly ZIP with no account, no key and no referrer check, and the FERC-mandated OASIS node publishes an
anonymously listable object store of transmission postings. Consumer data is the exact opposite - there is none, and none
is expected, because NYISO holds no retail customer relationships. Every real REST API NYISO documents - the Finance APIs
(Metering, Settlements, Invoicing) and the Metering API under api.nyiso.com - is market-participant-only, gated behind an
MIS user account plus a NAESB-accredited digital certificate, and every one of those endpoints answers 401 anonymously.
The United States has no consumer energy data mandate behind Green Button, and in any case Green Button binds distribution
utilities, not system operators, so NYISO carries no Green Button or Consumer Data Right obligation at all.
accessModel:
pricing: free
onboarding: open
trial: false
try_now: true
public: true
label: Free - Open bulk data; REST APIs restricted to market participants
confidence: high
source:
- probe
generated: '2026-07-27'
method: observed
image: https://www.nyiso.com/o/nyiso-main-theme/images/logo.svg
tags:
- Energy
- United States
- Electricity
- Energy Markets
- Grid
- Open Data
- System Operator
- New York
- Renewables
- Emissions
created: '2026-07-27'
modified: '2026-07-27'
specificationVersion: '0.23'
apis:
- aid: nyiso:nyiso-mis-public-data
name: NYISO MIS Public Data Archive
description: NYISO's Market Information System public archive - the operator's flagship open data surface. Roughly sixty
machine-readable report families are published as predictable daily CSV files and monthly ZIP bundles under a stable path
convention, covering day-ahead and real-time zonal and generator LBMP, ancillary services prices, ISO load forecast, real-time
and integrated actual load, real-time fuel mix, ATC/TTC and long-term ATC/TTC, transmission and generation outages, limiting
constraints, interface limits and flows, PAR schedules and flows, Lake Erie circulation, bid data, capacity reports, zonal
and resource uplift, generator and load reference names, active transmission nodes, subzone definitions, and the DOE EIA-930
hourly demand postings. Fully anonymous over plain HTTP and HTTPS - no key, no account, no application, no licence click-through.
Verified by direct probe on 2026-07-27 - for example csv/damlbmp/20260725damlbmp_zone.csv, csv/realtime/20260725realtime_zone.csv,
csv/pal/20260725pal.csv, csv/rtfuelmix/20260725rtfuelmix.csv and csv/isolf/20260725isolf.csv each returned 200 text/csv,
and monthly bundles such as csv/damlbmp/20260701damlbmp_zone_csv.zip returned 200. This is a file-based data surface with
a URL convention, not a REST API, and NYISO publishes no OpenAPI, WSDL or JSON contract for it.
humanURL: https://www.nyiso.com/energy-market-operational-data
baseURL: http://mis.nyiso.com/public
tags:
- Open Data
- Energy Markets
- Electricity
- Grid
- Pricing
properties:
- type: Documentation
url: https://www.nyiso.com/energy-market-operational-data
- type: Portal
url: http://mis.nyiso.com/public/
- type: Documentation
url: https://www.nyiso.com/pricing-data
- type: Documentation
url: https://www.nyiso.com/load-data
- type: Documentation
url: https://www.nyiso.com/power-grid-data
- type: Documentation
url: https://www.nyiso.com/emissions-data
- type: JSONSchema
name: Day-Ahead Market Zonal LBMP (P-2A) record
url: json-schema/nyiso-damlbmp-zone-schema.json
- type: JSONSchema
name: Day-Ahead Market Generator LBMP (P-2B) record
url: json-schema/nyiso-damlbmp-gen-schema.json
- type: JSONSchema
name: Real-Time Market Zonal LBMP (P-24A) record
url: json-schema/nyiso-realtime-zone-schema.json
- type: JSONSchema
name: Real-Time Actual Load (P-58B) record
url: json-schema/nyiso-pal-schema.json
- type: JSONSchema
name: Integrated Real-Time Actual Load (P-58C) record
url: json-schema/nyiso-palIntegrated-schema.json
- type: JSONSchema
name: Real-Time Fuel Mix (P-63) record
url: json-schema/nyiso-rtfuelmix-schema.json
- type: JSONSchema
name: ISO Load Forecast (P-7) record
url: json-schema/nyiso-isolf-schema.json
- type: JSONSchema
name: Real-Time Ancillary Services Prices (P-6B) record
url: json-schema/nyiso-rtasp-schema.json
- type: JSONSchema
name: Day-Ahead Ancillary Services Prices (P-5) record
url: json-schema/nyiso-damasp-schema.json
- type: JSONSchema
name: Day-Ahead Scheduled Outages (P-54C) record
url: json-schema/nyiso-outSched-schema.json
- type: DataModel
name: MIS public report catalogue and data model
url: data-model/nyiso-data-model.yml
- type: AgentSkill
name: Pull NYISO market and system data
url: skills/nyiso-pull-market-data.md
- aid: nyiso:nyiso-oasis-postings
name: NYISO OASIS Postings
description: NYISO's Open Access Same-Time Information System (OASIS) node, the FERC Order 889/890 transmission-service
transparency surface. The operator front-end at oasis.nyiso.com is a single-page application backed by a publicly readable
object store at oasis-postings.nyiso.com, which answers an anonymous S3 ListBucket request with 200 application/xml and
serves each posting in parallel CSV, HTML and PDF renderings under keys such as ACTIVE_TRANSMISSION_NODE/CSV/activetransmissionnodes.csv
and ATC_TTC/CSV/YYYY/MM/DD/atc_ttc-YYYYMMDD.csv with history reaching back to 1999. No credentials of any kind are required.
Verified by probe on 2026-07-27. Conformance to the NAESB WEQ-001 OASIS template interface was NOT verified - template-style
paths under oasis.nyiso.com returned the SPA's HTML shell rather than a template response - so this is recorded as an
open postings surface, not as a confirmed WEQ-001 implementation.
humanURL: http://oasis.nyiso.com/
baseURL: https://oasis-postings.nyiso.com
tags:
- Open Data
- Transmission
- Grid
- OASIS
- Electricity
properties:
- type: Portal
url: http://oasis.nyiso.com/
- type: Documentation
url: https://www.nyiso.com/energy-market-operational-data
- aid: nyiso:nyiso-finance-metering-api
name: NYISO Finance Metering API
description: The Metering component of NYISO's Finance APIs - submission and retrieval of hourly revenue-grade meter data
for generators, ties and subzones, plus retrieval of calculated subzone load in summary and detail form, transmission
owner load submission, retrieval and verification, generator performance data, and minimum oil burn events. JSON request
and response bodies, ISO-8601 dates and times with Eastern offsets, up to four decimals of MWh precision, HTTPS 1.1 over
TLS 1.2. Documented operations include POST and GET /v1/powerMetering, GET /v1/calculatedSubzoneLoad/summary and /detail,
POST and GET /v1/transmissionOwnerLoad, GET /v1/transmissionOwnerLoad/verification/summary and /detail, GET /v1/generatorPerformance,
and GET plus POST on /v1/minOilBurnEvent and its /generator and /transmissionOwner variants. This API replaced the retired
SDX upload/download application, which NYISO withdrew on 2025-09-17. Access is restricted to NYISO market participants
- two-factor, requiring a valid MIS user account and password over HTTP Basic plus the NAESB certificate associated with
that account on every request. All endpoints returned 401 Authorization Required to anonymous probes on 2026-07-27. A
market-trial environment exists at apitest.nyiso.com and also answered 401.
humanURL: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
baseURL: https://api.nyiso.com/finance/metering
tags:
- Metering
- Settlement
- Electricity
- Market Participants
tags_raw:
- Metering
- Settlements
- Electricity
- Market Participants
properties:
- type: Documentation
url: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- type: Documentation
url: https://www.nyiso.com/billings-and-settlements
- type: Documentation
url: https://www.nyiso.com/documents/20142/3625950/mpug.pdf
- type: Documentation
url: https://www.nyiso.com/documents/20142/3625950/SDA_UG.pdf
- type: APIReference
name: Finance APIs User's Guide v1.2 (Metering endpoints, parameters and payloads)
url: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- type: AgentSkill
name: Submit and retrieve revenue-grade meter data
url: skills/nyiso-submit-meter-data.md
- type: Sandbox
name: API Market Trial environment (apitest.nyiso.com)
url: sandbox/nyiso-sandbox.yml
- aid: nyiso:nyiso-finance-settlements-api
name: NYISO Finance Settlements API
description: The Settlements component of NYISO's Finance APIs. The published guide documents GET /v1/stationPower, retrieving
station power settlement data by billing month with an optional version parameter, as JSON over HTTPS 1.1 with TLS 1.2.
Restricted to NYISO market participants under the same two-factor scheme as the rest of the Finance APIs - MIS user account
and password via HTTP Basic plus the associated NAESB certificate on every request. The root and the stationPower endpoint
both returned 401 Authorization Required to anonymous probes on 2026-07-27.
humanURL: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
baseURL: https://api.nyiso.com/finance/settlements
tags:
- Settlement
- Electricity
- Market Participants
tags_raw:
- Settlements
- Electricity
- Market Participants
properties:
- type: Documentation
url: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- type: Documentation
url: https://www.nyiso.com/billings-and-settlements
- type: APIReference
name: Finance APIs User's Guide v1.2 (Settlements - GET /v1/stationPower)
url: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- type: Sandbox
name: API Market Trial environment (apitest.nyiso.com)
url: sandbox/nyiso-sandbox.yml
- aid: nyiso:nyiso-finance-invoicing-api
name: NYISO Finance Invoicing API
description: The Invoicing component of NYISO's Finance APIs, retrieving daily reconciliation data for both settlements
dollars and energy volumes. The published guide documents GET /v1/dailyReconciliation/dollar and GET /v1/dailyReconciliation/mwh,
parameterised by start date and an optional version, returning JSON with two decimals of dollar precision and four decimals
of MWh precision. Restricted to NYISO market participants - MIS user account and password via HTTP Basic plus the associated
NAESB certificate on every request. Both the root and /v1/dailyReconciliation/dollar returned 401 Authorization Required
to anonymous probes on 2026-07-27.
humanURL: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
baseURL: https://api.nyiso.com/finance/invoicing
tags:
- Invoicing
- Settlement
- Electricity
- Market Participants
tags_raw:
- Invoicing
- Settlements
- Electricity
- Market Participants
properties:
- type: Documentation
url: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- type: Documentation
url: https://www.nyiso.com/billings-and-settlements
- type: APIReference
name: Finance APIs User's Guide v1.2 (Invoicing - daily reconciliation endpoints)
url: https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- type: Sandbox
name: API Market Trial environment (apitest.nyiso.com)
url: sandbox/nyiso-sandbox.yml
- aid: nyiso:nyiso-metering-api
name: NYISO Metering API
description: NYISO's standalone Metering API, documented separately from the Finance APIs guide and served from its own
root at api.nyiso.com/metering. It covers submission and retrieval of hourly revenue-grade meter data for generators,
ties and subzones via POST and GET /v1/powerMetering, and retrieval of calculated subzone load via GET /v1/calculatedSubzoneLoad/summary
and /v1/calculatedSubzoneLoad/detail. JSON bodies, ISO-8601 dates and times, HTTPS 1.1 over TLS 1.2, and a rolling three-year-and-ten-month
data availability window ending with the current month. Two-factor authentication is required - MIS user account and password
via HTTP Basic plus the NAESB certificate associated with that account on every request. The root and /v1/powerMetering
both returned 401 Authorization Required to anonymous probes on 2026-07-27.
humanURL: https://www.nyiso.com/documents/20142/27889215/NYISO%20Metering%20API%20User%20Guide.pdf/d8ed36d3-1a40-9584-6961-3fdb845ca4fa
baseURL: https://api.nyiso.com/metering
tags:
- Metering
- Electricity
- Market Participants
properties:
- type: Documentation
url: https://www.nyiso.com/documents/20142/27889215/NYISO%20Metering%20API%20User%20Guide.pdf/d8ed36d3-1a40-9584-6961-3fdb845ca4fa
- type: Documentation
url: https://www.nyiso.com/documents/20142/3625950/mpug.pdf
- type: Documentation
url: https://www.nyiso.com/documents/20142/3625950/SDA_UG.pdf
- type: APIReference
name: NYISO Metering API User Guide (endpoints, parameters and payloads)
url: https://www.nyiso.com/documents/20142/27889215/NYISO%20Metering%20API%20User%20Guide.pdf/d8ed36d3-1a40-9584-6961-3fdb845ca4fa
- type: AgentSkill
name: Submit and retrieve revenue-grade meter data
url: skills/nyiso-submit-meter-data.md
common:
- type: DomainSecurity
url: security/nyiso-domain-security.yml
- type: Website
url: https://www.nyiso.com/
- type: Portal
url: http://mis.nyiso.com/public/
- type: Documentation
url: https://www.nyiso.com/energy-market-operational-data
- type: Documentation
url: https://www.nyiso.com/manuals-tech-bulletins-user-guides
- type: Login
url: https://www.nyiso.com/market-access-login
- type: Legal
url: https://www.nyiso.com/legal-notice
- type: TermsOfService
url: https://www.nyiso.com/legal-notice
- type: Support
name: Stakeholder Services
url: https://www.nyiso.com/contact-us
- type: Blog
url: https://www.nyiso.com/blog
- type: Authentication
name: NYISO authentication profile
url: authentication/nyiso-authentication.yml
- type: Conventions
name: NYISO API and archive conventions
url: conventions/nyiso-conventions.yml
- type: ErrorCatalog
name: NYISO HTTP status and validation error catalogue
url: errors/nyiso-problem-types.yml
- type: Lifecycle
name: NYISO versioning, retirement and change communication
url: lifecycle/nyiso-lifecycle.yml
- type: Deprecation
name: SDX Upload/Download application retirement notice (sunset 2025-09-17)
url: https://www.nyiso.com/documents/20142/20259596/SDX-Upload-Download-Application-Retirement.pdf/93ebf171-b383-520d-b3af-00cb9f433d3c
- type: Sandbox
name: API Market Trial environment and validation-only submissions
url: sandbox/nyiso-sandbox.yml
- type: Conformance
name: NYISO standards conformance
url: conformance/nyiso-conformance.yml
- type: Packages
name: Third-party NYISO client libraries (no first-party SDK exists)
url: packages/nyiso-packages.yml
- type: DataModel
name: NYISO data model and MIS public report catalogue
url: data-model/nyiso-data-model.yml
- type: LLMsTxt
url: llms/nyiso-llms.txt
- type: AgentSkill
name: NYISO agent skills index
url: skills/_index.yml
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
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