ISO-NE Interconnection Queue

Overview

The ISO-NE interconnection queue endpoint provides access to real-time data from ISO New England’s interconnection queue, which serves all six New England states.

Endpoint

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/iso-ne?limit=50"

Coverage Area

States Served: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. Note: Small number of projects in New Brunswick, Canada and New York also included.

Query Parameters

Parameter	Type	Default	Description
`limit`	integer	1000	Number of records to return (50-5000)
`offset`	integer	0	Number of records to skip
`state`	string	-	Filter by state code (MA, CT, ME, etc.) - supports comma-separated
`technology`	string	-	Filter by standardized technology type - supports comma-separated
`status`	string	-	Filter by standardized status
`min_capacity`	number	-	Minimum capacity in MW
`max_capacity`	number	-	Maximum capacity in MW
`developer`	string	-	Filter by developer name (supports partial matches)

Technology Options

Use standardized technology names for consistent filtering. See our Interconnection Reference for all available options.

Technology	Description
`Solar`	Solar photovoltaic projects
`Wind`	Wind turbine projects (onshore)
`Battery`	Battery energy storage systems
`Hybrid - Solar + Storage`	Combined solar and battery projects
`Hybrid - Wind + Storage`	Combined wind and battery projects
`Natural Gas`	Natural gas generation (combined cycle, gas turbines)
`Nuclear`	Nuclear power plants
`Hydro`	Hydroelectric generation
`Other`	Other technologies

Status Options

Status	Count	Description
`Planned`	93	Active projects currently in interconnection queue
`Operating`	351	Projects that achieved commercial operation
`Cancelled`	1,308	Projects withdrawn from queue

Top States by Project Count

State	Project Count	Top Technologies
Massachusetts	~600	Solar, Hybrid Storage
Connecticut	~400	Solar, Natural Gas
Maine	~300	Solar, Wind
New Hampshire	~200	Solar
Rhode Island	~150	Solar
Vermont	~100	Solar, Wind, Hydro

Example Requests

Get Active Solar Projects in Maine

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/iso-ne?technology=Solar&status=Planned&state=ME&limit=50"

Returns active solar projects in ISO-NE’s queue. Uses technology=Solar for standardized filtering.

Get Hybrid Solar + Storage Projects

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/iso-ne?technology=Hybrid - Solar + Storage&limit=50"

Finds projects combining solar PV with battery storage, common in ISO-NE’s interconnection queue.

Get Projects with CNR Service Type

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/iso-ne?status=Planned&limit=200"

Filter for Capacity Network Resource (CNR) projects in the response. CNR is the most common service type for battery storage in New England.

Get Brookfield Projects

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/iso-ne?developer=Brookfield&limit=50"

Filters for projects developed by Brookfield. Uses partial matching to find all Brookfield projects across New England.

Get Projects by Multiple Technologies

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/iso-ne?technology=Solar,Wind,Battery&limit=50"

Uses comma-separated values for multiple technology filtering.

Response Schema

{
  "success": true,
  "iso": "NEISO",
  "summary": {
    "limit": 50,
    "offset": 0,
    "total_results": 1752,
    "has_more": true,
    "current_page": 1,
    "total_pages": 36
  },
  "filters": {
    "state": null,
    "technology": null,
    "status": null,
    "min_capacity": null,
    "max_capacity": null,
    "developer": null
  },
  "data": [
    {
      "iso": "ISNE",
      "queue_id": "1021_emery_meadow_solar_req20200427_ME_york_poicmp_345_kv_section_182",
      "project_name": "Emery Meadow Solar",
      "capacity_mw": 16.425,
      "technology": "G",
      "fuel": "SUN",
      "status": "Planned",
      "detailed_status": null,
      "operating_date": "2026-09-30T07:00:00.000Z",
      "request_date": "2020-04-27T07:00:00.000Z",
      "county": "York",
      "state": "ME",
      "queue_position": "1021",
      "neiso_developer": "PD",
      "developer": "Glenvale Solar",
      "data_source": "active",
      "balancing_authority_code": "ISNE",
      "technology_normalized": "Solar",
      "project_id": "1021_emery_meadow_solar_req20200427_ME_york_poicmp_345_kv_section_182",
      "cluster": null,
      "last_updated": "2024-07-11T20:30:33.089Z",
      "project_type": "G",
      "requested_date": "2020-04-27T07:00:00.000Z",
      "unit_id": "PV",
      "fuel_type": "SUN",
      "summer_capacity_mw": 16.425,
      "winter_capacity_mw": 16.425,
      "operation_date": "2026-09-30T07:00:00.000Z",
      "synchronization_date": "2026-08-01T07:00:00.000Z",
      "withdrawal_date": null,
      "interconnection_location": "CMP 34.5 kV, Section 182",
      "service_type": "CNR",
      "sis_complete": true,
      "i39": true,
      "to_report": "ISO-NE",
      "zone": "ME",
      "fs": null,
      "sis": "Document Posted",
      "os": null,
      "fac": null,
      "ia": "Executed"
    },
    {
      "iso": "ISNE",
      "queue_id": "1138_husky_solar_req20210603_CT_windham_poithe_poi_will_be_located_about_69_miles_from_the_16071505_line_row_exeter_tap_and_about_11_miles_from_the_exeter_sub_54n_along_the_115_kv_underground_line_to_the_exeter_sub_54n",
      "project_name": "Husky Solar",
      "capacity_mw": 50.159,
      "technology": "G",
      "fuel": "SUN",
      "status": "Planned",
      "detailed_status": null,
      "operating_date": "2029-05-10T07:00:00.000Z",
      "request_date": "2021-06-03T07:00:00.000Z",
      "county": "Windham",
      "state": "CT",
      "queue_position": "1138",
      "neiso_developer": "PD",
      "developer": "Brookfield",
      "data_source": "active",
      "balancing_authority_code": "ISNE",
      "technology_normalized": "Solar",
      "project_id": "1138_husky_solar_req20210603_CT_windham_poithe_poi_will_be_located_about_69_miles_from_the_16071505_line_row_exeter_tap_and_about_11_miles_from_the_exeter_sub_54n_along_the_115_kv_underground_line_to_the_exeter_sub_54n",
      "cluster": null,
      "last_updated": "2025-10-17T20:47:49.473Z",
      "project_type": "G",
      "requested_date": "2021-06-03T07:00:00.000Z",
      "unit_id": "PV",
      "fuel_type": "SUN",
      "summer_capacity_mw": 50.159,
      "winter_capacity_mw": 50.159,
      "operation_date": "2029-05-10T07:00:00.000Z",
      "synchronization_date": "2029-05-01T07:00:00.000Z",
      "withdrawal_date": null,
      "interconnection_location": "The POI will be located about 6.9 miles from the 1607/1505 line ROW (Exeter Tap) and about 1.1 miles from the Exeter Sub 54N along the 115 kV underground line to the Exeter Sub 54N.",
      "service_type": "NR",
      "sis_complete": true,
      "i39": true,
      "to_report": "ISO-NE",
      "zone": "CT",
      "fs": "Document Posted",
      "sis": "Document Posted",
      "os": "Not Required",
      "fac": "Not Required",
      "ia": "Executed"
    }
  ]
}

Complete Upstream Data: Each project includes all 41 database columns from ISO-NE’s interconnection queue at the top level. This provides complete transparency with both standardized fields (normalized across all ISOs) and ISO-NE-specific raw fields like fs, sis, os, fac, ia (five-phase study process), i39 (small generator designation), and service_type (CNR, NR, etc.).

Response Fields

Core Identification Fields

Field	Type	Description
`iso`	string	Always “ISNE” for ISO New England data
`queue_id`	string	Unique project identifier combining queue position, technology, location
`project_id`	string	Alias for queue_id (standardized across all ISOs)
`project_name`	string	Official project name in ISO-NE queue
`queue_position`	string	Numeric queue position assigned when interconnection request deemed complete
`balancing_authority_code`	string	Always “ISNE”
`last_updated`	date	Timestamp of last data update in Cleanview database

Capacity & Technology

Field	Type	Description
`capacity_mw`	number	Primary nameplate capacity rating in MW
`summer_capacity_mw`	number	Summer-rated capacity (typically lower due to heat derating)
`winter_capacity_mw`	number	Winter-rated capacity (typically higher in New England climate)
`technology`	string	Raw project type code (G=Generation, TS=Transmission Service, ETU=Elective Transmission Upgrade)
`technology_normalized`	string	Standardized technology category for cross-ISO filtering
`fuel`	string	Raw fuel type code (SUN, WND, BAT, etc., space-separated for hybrids)
`fuel_type`	string	Detailed fuel type with hybrid combinations
`unit_id`	string	Unit type identifier (PV, WT, OT, CC, GT, ST, HD, HW, IC, FC, PS)
`project_type`	string	Project classification: G (Generation), TS (Transmission Service), ETU (Elective Transmission Upgrade)

Project Status & Dates

Field	Type	Description
`status`	string	Standardized status (Planned, Operating, Cancelled, Inactive)
`detailed_status`	string	Original ISO-NE detailed status (typically null, enriched in data_source)
`request_date`	date	Date interconnection request submitted to ISO-NE
`requested_date`	date	Alias for request_date
`operating_date`	date	Projected commercial operation date
`operation_date`	date	Alias for operating_date
`synchronization_date`	date	Date project synchronized to the grid
`withdrawal_date`	date	Date project withdrew from queue (null if not withdrawn)

Location

Field	Type	Description
`state`	string	Two-letter state code (MA, CT, ME, NH, RI, VT, plus NB [Canada], NY)
`county`	string	County within state where project is located
`zone`	string	ISO-NE load zone (13 zones: BOST, CT, ME, NH, RI, VT, SEMA, WMA, NOR, CMA, SME, SWCT, BHE)
`interconnection_location`	string	Detailed point of interconnection description

Study Process (Five-Phase Sequence)

Field	Type	Description
`fs`	string	Feasibility Study status (Not Started, In Progress, Document Posted, Not Required)
`sis`	string	System Impact Study status (adds ISA Not Executed option for projects without signed ISA)
`os`	string	Optional Study status (Document Posted, Not Required - rarely needed)
`fac`	string	Facilities Study status (engineering design and cost estimates)
`ia`	string	Interconnection Agreement status (adds IA Filed Unexecuted, Executed options)

Grid Connection & Service

Field	Type	Description
`service_type`	string	Type of interconnection service (CNR, NR, CNI, NI, ES, MIS, NS)
`sis_complete`	boolean	Indicates whether System Impact Study has been completed
`i39`	boolean	Indicates if project follows I.3.9 small generator (≤20 MW) interconnection process

Developer Information

Field	Type	Description
`neiso_developer`	string	Developer name from original ISO-NE queue data
`developer`	string	Cleanview-enriched developer name with corporate hierarchy mapping

ISO-NE Specific Fields

Field	Type	Description
`data_source`	string	Source dataset lifecycle (active, withdrawn, commercial)
`to_report`	string	Reporting entity/transmission owner (ISO-NE, BHE, CMP, MPS, NGRID, NSTAR, NU, TEUS, UI)
`cluster`	string	Cluster study group assignment (typically null)

ISO-NE Queue Terminology

Understanding ISO New England’s specific interconnection processes and terminology is essential for working with their queue data.

I.3.9 Interconnection Process

Section I.3.9 of ISO-NE’s Open Access Transmission Tariff (OATT) governs the interconnection process for small generators (≤20 MW capacity). This expedited process is designed for smaller distributed generation projects. Projects are assigned numeric queue positions (e.g., “1000”, “1021”) when their interconnection application is deemed complete by ISO-NE.

Study Process Phases

ISO-NE uses a comprehensive five-phase study sequence for interconnection projects. Each phase has specific deliverables and status values:

Phase	Field	Possible Values	Description
Feasibility Study	`fs`	Not Started, In Progress, Document Posted, Not Required	Initial assessment of interconnection feasibility and system impacts
System Impact Study	`sis`	Not Started, In Progress, Document Posted, Not Required, ISA Not Executed	Detailed reliability analysis requiring Interconnection System Agreement (ISA)
Optional Study	`os`	Document Posted, Not Required	Additional studies requested by customer (rarely required)
Facilities Study	`fac`	Not Started, In Progress, Document Posted, Not Required	Engineering design and cost estimates for required interconnection facilities
Interconnection Agreement	`ia`	Not Started, In Progress, Document Posted, Not Required, IA Filed Unexecuted, Executed	Final agreement governing interconnection terms and conditions

Study Status Details:

Not Started: Study phase has not yet begun
In Progress: Study currently being conducted by ISO-NE or transmission owner
Document Posted: Study completed and results published
Not Required: Study phase not needed for this project type
ISA Not Executed: (SIS only) Study cannot proceed without signed Interconnection System Agreement
IA Filed Unexecuted: (IA only) Agreement filed with FERC but not yet executed by all parties
Executed: (IA only) Final agreement signed by all parties

Service Types

ISO-NE offers seven types of interconnection service, determining how the project participates in New England’s wholesale electricity markets:

Code	Full Name	Description	Common Use Cases
CNR	Capacity Network Resource	Full network interconnection service with capacity supply rights	Battery storage projects (30+ active CNR projects)
NR	Network Resource	Energy delivery service via transmission network	Solar projects (22+ active NR projects)
CNI	Capacity Network Import	Network import service with capacity designation	Imports from neighboring regions with capacity rights
NI	Network Import	Import interconnection from external areas	Energy imports from New York, Canada, or Maritime provinces
ES	Energy Service	Energy-only interconnection without capacity rights	Projects selling energy only, not participating in capacity market
MIS	Market Interconnection Service	Historical service type for capacity increases at existing facilities	Legacy designation for uprates and expansions
NS	Network Service	Legacy network service designation	Older projects predating current service type structure

Load Zones

ISO-NE divides New England into 13 load zones for locational pricing and resource planning:

Zone Code	Geographic Area	Description
BOST	Boston	Metro Boston area, Massachusetts
CT	Connecticut	Connecticut aggregate zone
ME	Maine	Maine aggregate zone
NH	New Hampshire	New Hampshire aggregate zone
RI	Rhode Island	Rhode Island aggregate zone
VT	Vermont	Vermont aggregate zone
SEMA	Southeast Massachusetts	Cape Cod and southeastern Massachusetts
WMA	Western/Central Massachusetts	Western and central Massachusetts regions
NOR	Northeast Massachusetts	Northeast Massachusetts
CMA	Central Massachusetts	Central Massachusetts
SME	Southern Maine	Southern Maine region
SWCT	Southwest Connecticut	Southwest Connecticut
BHE	Bangor Hydro Electric	Northern Maine (Bangor Hydro service territory)

Project Classifications

ISO-NE categorizes projects into three main types: Project Types (project_type field):

G (Generation): New generation facilities - represents vast majority of queue
TS (Transmission Service): Transmission-only interconnection requests
ETU (Elective Transmission Upgrade): Merchant transmission upgrades proposed by developers

Unit Types (unit_id field - 11 codes):

PV: Photovoltaic (solar)
WT: Wind Turbines
OT: Other (typically used for batteries)
CC: Combined Cycle (natural gas)
GT: Gas Turbines
ST: Steam Turbines
HD: Hydraulic/Hydro
HW: Hydro Water Wheels
IC: Internal Combustion
FC: Fuel Cells
PS: Pumped Storage

Seasonal Capacity Ratings

New England experiences significant temperature variations affecting equipment performance. ISO-NE therefore tracks both summer and winter capacity ratings:

Summer Capacity (summer_capacity_mw): Capacity rating during hot weather, typically lower due to heat derating of transformers and transmission equipment
Winter Capacity (winter_capacity_mw): Capacity rating during cold weather, typically higher as equipment operates more efficiently at lower temperatures

Winter capacity is particularly important in New England due to peak electricity demand occurring during cold weather events when natural gas is also needed for heating.

Fuel Type Hybrid Notation

ISO-NE represents hybrid projects using space-separated fuel codes in the fuel and fuel_type fields:

“SUN BAT”: Solar + Battery hybrid
“WND BAT”: Wind + Battery hybrid
“NG SUN BAT”: Natural Gas + Solar + Battery multi-technology project

This differs from other ISOs that may use different delimiters or create separate records for each technology component.

Data Source Lifecycle

The data_source field tracks projects through their lifecycle:

active: Projects currently in interconnection queue or under development (93 projects)
withdrawn: Projects that withdrew from the queue before achieving commercial operation (1,308 projects - 75% of total)
commercial: Projects that successfully achieved commercial operation (351 projects)

The 75% withdrawal rate reflects the speculative nature of many interconnection requests and the challenges of project development in New England.

Transmission Owners

The to_report field identifies the reporting entity or transmission owner responsible for the interconnection. Nine entities report to ISO-NE: Transmission Owners:

ISO-NE: ISO New England itself (for system-level projects)
BHE: Bangor Hydro Electric (Northern Maine)
CMP: Central Maine Power
MPS: Massachusetts Power Supply (historical)
NGRID: National Grid (Massachusetts, Rhode Island)
NSTAR: Eversource (previously NSTAR, Eastern Massachusetts)
NU: Northeast Utilities/Eversource (Connecticut, New Hampshire)
TEUS: Transmission Enhancement Services
UI: United Illuminating (Connecticut)

Data Updates: ISO-NE queue data is updated based on ISO New England’s interconnection queue reports published periodically.

Developer Field Limitations: The neiso_developer field often contains “PD” (Protected Developer) for confidentiality. The enriched developer field provides better corporate entity mapping but may still have limited coverage for smaller developers.

Geographic Edge Cases: While ISO-NE primarily serves the six New England states, a small number of projects are located in New Brunswick, Canada (state code “NB”) and New York (state code “NY”) that interconnect to the New England grid system.

Authorizations

x-api-key

string

header

required

API key authentication using x-api-key header

Query Parameters

limit

integer

default:50

Number of records to return

Required range: 50 <= x <= 5000

offset

integer

default:0

Number of records to skip

state

string

Filter by state code

technology

string

Filter by technology type

min_capacity

number

Minimum capacity in MW

max_capacity

number

Maximum capacity in MW

Response

Successful response with ISO-NE interconnection queue data

iso

string

Example:

"ISO-NE"

summary

object

Summary metadata for pagination

Show child attributes

summary.limit

integer

Number of records per page

summary.offset

integer

Number of records to skip

summary.total_results

integer

Total number of records matching the query

summary.has_more

boolean

Whether additional records exist beyond this page

summary.current_page

integer

Current page number (1-indexed)

summary.total_pages

integer

Total number of pages available

filters

object

Applied filters for the request

data

object[]

Array of interconnection queue records

Overview

EIA Data

Interconnection Queues

Projects

Overview

Endpoint

Coverage Area

Query Parameters

Technology Options

Status Options

Top States by Project Count

Example Requests

Response Schema

Response Fields

Core Identification Fields

Capacity & Technology

Project Status & Dates

Location

Study Process (Five-Phase Sequence)

Grid Connection & Service

Developer Information

ISO-NE Specific Fields

ISO-NE Queue Terminology

I.3.9 Interconnection Process

Study Process Phases

Service Types

Load Zones

Project Classifications

Seasonal Capacity Ratings

Fuel Type Hybrid Notation

Data Source Lifecycle

Transmission Owners

Authorizations

Query Parameters

Response

Overview

EIA Data

Interconnection Queues

Projects

​Overview

​Endpoint

​Coverage Area

​Query Parameters

​Technology Options

​Status Options

​Top States by Project Count

​Example Requests

​Response Schema

​Response Fields

​Core Identification Fields

​Capacity & Technology

​Project Status & Dates

​Location

​Study Process (Five-Phase Sequence)

​Grid Connection & Service

​Developer Information

​ISO-NE Specific Fields

​ISO-NE Queue Terminology

​I.3.9 Interconnection Process

​Study Process Phases

​Service Types

​Load Zones

​Project Classifications

​Seasonal Capacity Ratings

​Fuel Type Hybrid Notation

​Data Source Lifecycle

​Transmission Owners

Authorizations

Query Parameters

Response

Overview

Endpoint

Coverage Area

Query Parameters

Technology Options

Status Options

Top States by Project Count

Example Requests

Response Schema

Response Fields

Core Identification Fields

Capacity & Technology

Project Status & Dates

Location

Study Process (Five-Phase Sequence)

Grid Connection & Service

Developer Information

ISO-NE Specific Fields

ISO-NE Queue Terminology

I.3.9 Interconnection Process

Study Process Phases

Service Types

Load Zones

Project Classifications

Seasonal Capacity Ratings

Fuel Type Hybrid Notation

Data Source Lifecycle

Transmission Owners