New York Independent System Operator (NYISO)

NYISO Metering API

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.

GitHub

Documentation

📖
Documentation
https://www.nyiso.com/documents/20142/27889215/NYISO%20Metering%20API%20User%20Guide.pdf/d8ed36d3-1a40-9584-6961-3fdb845ca4fa
📖
Documentation
https://www.nyiso.com/documents/20142/3625950/mpug.pdf
📖
Documentation
https://www.nyiso.com/documents/20142/3625950/SDA_UG.pdf
📖
APIReference
https://www.nyiso.com/documents/20142/27889215/NYISO%20Metering%20API%20User%20Guide.pdf/d8ed36d3-1a40-9584-6961-3fdb845ca4fa

Other Resources

🔗
AgentSkill
https://raw.githubusercontent.com/api-evangelist/nyiso/refs/heads/main/skills/nyiso-submit-meter-data.md

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API entry from apis.yml

apis.yml Raw ↑ 
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