# ISO New England

**Canonical:** https://apis.io/providers/iso-new-england/  
**Website:** https://www.iso-ne.com/  
**APIs profiled:** 1

ISO New England Inc. is the independent, nonprofit regional transmission organization authorized by the Federal Energy Regulatory Commission to operate the high-voltage power system, administer the wholesale electricity markets, and plan the power system for Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, and most of Maine. Home market is the United States. It sits at the wholesale layer of the value chain, between generators, transmission owners, interconnections with New York and Canada, and the load-serving entities that resell power to retail customers - and it states on its own site that handling retail electricity is something it does not do. Its API posture is the sector's classic split, read from the wholesale end. Market and system data is genuinely open, so open that the ISO Express portal serves full nodal day-ahead LMP files as anonymous CSV and the public dashboards are backed by an anonymous JSON feed. Consumer data does not exist here at all, and cannot, because ISO New England holds no retail customer relationships and no Green Button, ESPI, or consumer data-portability mandate reaches it. The one documented programmatic contract, the Web Services API v1.1, is a real, richly documented RESTful surface of 477 path templates across 90 market and operations resources, but it answers 401 to anonymous callers - a developer must first create a free, self-serve ISO Express account, which the ISO says automatically grants access to the data feeds, and then authenticate with HTTP Basic over SSL.

## Kin Score — 55.9 / 100 (strong)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 55.9).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 65.7 |
| Governance | 31.8 |
| Contract Governance | 31.8 |
| Operational Transparency | 23.7 |
| Developer Ergonomics | 58.9 |
| Commercial Clarity | 42.1 |
| Access Clarity | 42.1 |

Regulatory layer — **Energy & Utilities**: 51.4 (matched via tags).

## Agent readiness — 40.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | na |
| Error Semantics | documented |
| OpenAPI Examples | partial |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Free - Self-serve ISO Express account required for the API — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (1)

- **ISO New England Web Services API v1.1** — ISO New England's RESTful interface to energy and market data, deployed November 2013 and still the current version. The public Enunciate-generated technical documentation at we...

## MCP servers (1)

- **ISO New England MCP Server**

## Agentic access (1)

- **Iso New England Agentic Access** — 489 operations

## Security (2)

- **Iso New England Authentication** — http · 1 scheme
- **Iso New England Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Energy, United States, Electricity, Energy Markets, Grid, Open Data, Wholesale Markets, Demand Response, Renewables, New England

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/iso-new-england/). Scores are computed from the provider's own public artifacts under a published rubric.