CAISO Interconnection Queue

Overview

The CAISO interconnection queue endpoint provides access to real-time data from the California Independent System Operator (CAISO) interconnection queue, which serves most of California and parts of Nevada.

CAISO Coverage: Contains 3,027 projects across California (89%), Nevada (5%), Arizona (4%), and Mexico (1%). Top technologies: Solar (1,200+ projects), Battery Storage (1,100+ projects), Wind (300+ projects).

Hybrid Projects: CAISO represents hybrid projects (e.g., solar + storage) as single rows in their Excel source files with multiple technology columns. Our API splits these into separate records for each technology component. See our comprehensive guide on hybrid project handling for details.

Endpoint

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

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 (CA, NV, AZ) - 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.

CAISO Technology Field Mapping: CAISO represents technology information differently from other ISOs. When filtering by technology=Solar, the API searches both the technology field (which contains CAISO’s original terms like “Photovoltaic”) and the fuel field (which contains “Solar”). This ensures consistent cross-ISO filtering while preserving CAISO’s original data structure.Example: A CAISO solar project returns:

technology: “Photovoltaic” (CAISO’s original term)
fuel: “Solar” (standardized term)
Both fields are searched when using technology=Solar filter

Technology	Count	Description
`Solar`	1,200+	Solar photovoltaic projects (searches both `technology` and `fuel` fields)
`Battery`	1,100+	Battery energy storage systems
`Wind`	300+	Wind turbine projects
`Natural Gas`	180+	Natural gas generation
`Other`	200+	Other technologies

Status Options

Status	Count	Description
`Planned`	1,800+	Active projects in queue
`Operating`	800+	Commercial operation achieved
`Cancelled`	400+	Withdrawn or terminated

Example Requests

Get Active Solar Projects in California

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

Returns active solar projects in the CAISO queue. Uses technology=Solar for standardized filtering.

Get Large Battery Storage Projects (>100 MW)

curl -H "x-api-key: your_api_key_here" \
  "https://api.cleanview.co/api/v1/interconnection/caiso?technology=Battery&min_capacity=100&limit=50"

Finds large-scale battery storage projects. Uses technology=Battery for energy storage systems.

Get Wind Projects

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

Filters for wind projects in the CAISO queue.

Get Projects by Multiple Technologies

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

Uses comma-separated values for multiple technology filtering.

Get NextEra Energy Projects

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

Filters for projects developed by NextEra Energy. Uses partial matching, so “NextEra” matches “NextEra Energy Resources”.

Get Projects Without Developer Information

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

Returns only projects that don’t have developer information mapped in Cleanview’s database.

Response Schema

{
  "iso": "CAISO",
  "summary": {
    "limit": 50,
    "offset": 0,
    "total_results": 3027,
    "has_more": true,
    "current_page": 1,
    "total_pages": 61
  },
  "filters": {
    "state": null,
    "technology": null,
    "status": null,
    "min_capacity": null,
    "max_capacity": null,
    "developer": null
  },
  "data": [
    {
      "iso": "CISO",
      "queue_id": "1000_combined_cycle",
      "project_name": "Heca Scs",
      "capacity_mw": 300,
      "technology": "Combined Cycle",
      "fuel": "Other",
      "status": "Cancelled",
      "detailed_status": "Withdrawn",
      "operating_date": "2019-01-01T16:00:00.000Z",
      "request_date": "2013-05-01T07:00:00.000Z",
      "county": "Kern",
      "state": "CA",
      "queue_position": "1000",
      "interconnecting_entity": null,
      "developer": null,
      "feasibility_study_status": null,
      "system_impact_study_status": "Complete",
      "facilities_study_status": null,
      "optional_study_status": null,
      "interconnection_agreement_status": null,
      "deliverability_status": "Full Capacity",
      "voltage_kv": null,
      "station_transmission_line": "Midway-Wheeler Ridge 230 kV Line",
      "study_area": null,
      "balancing_authority_code": "CISO",
      "technology_normalized": "Natural Gas",
      "site_id": "1000",
      "site_generator_id": "1000_combined_cycle",
      "project_number": null,
      "interconnection_request_date": "2013-05-01T07:00:00.000Z",
      "queue_date": "2013-04-30T14:00:00.000Z",
      "application_status": "Withdrawn",
      "study_process": "C06",
      "technology_type": "Combined Cycle",
      "fuel_type": "Other",
      "net_mws_to_grid": 300,
      "tpd_allocation_percentage": null,
      "off_peak_deliverability": null,
      "utility": "PGAE",
      "pto_study_region": null,
      "proposed_online_date": "2019-01-01T16:00:00.000Z",
      "current_online_date": "2019-01-01T16:00:00.000Z",
      "suspension_status": null,
      "original_type_number": 1,
      "project_uuid": null,
      "withdrawn_date": "2014-04-24T14:00:00.000Z",
      "withdrawal_reason": null
    }
  ]
}

Complete Upstream Data: Each project includes all 47 database columns from CAISO’s interconnection queue at the top level. This provides complete transparency with both standardized fields (normalized across all ISOs) and CAISO-specific raw fields like site_generator_id, deliverability_status, and study statuses.

Response Fields

Core Identification Fields

Field	Type	Description
`iso`	string	Always “CISO” for CAISO data
`queue_id`	string	Unique CAISO queue identifier (e.g., “1000_combined_cycle”)
`project_name`	string	Official project name in CAISO queue
`site_id`	string	CAISO site identifier
`site_generator_id`	string	Combined site and generator identifier
`project_number`	string	CAISO project tracking number (often null)
`project_uuid`	string	Unique project identifier (UUID format, often null)
`balancing_authority_code`	string	Always “CISO”

Capacity & Technology

Field	Type	Description
`capacity_mw`	number	Project nameplate capacity in MW
`net_mws_to_grid`	number	Net MW capacity to be delivered to grid
`technology`	string	CAISO’s technology classification (e.g., “Combined Cycle”)
`technology_type`	string	Detailed technology type from CAISO source
`technology_normalized`	string	Standardized technology for cross-ISO filtering
`fuel`	string	Primary fuel source
`fuel_type`	string	Detailed fuel type from CAISO source

Project Status & Dates

Field	Type	Description
`status`	string	Standardized status (Planned, Operating, Cancelled)
`detailed_status`	string	Original CAISO status (e.g., “Withdrawn”, “Active”)
`application_status`	string	Current application status in CAISO process
`queue_position`	string	Queue position number
`queue_date`	date	Date project entered CAISO queue
`request_date`	date	Interconnection request submission date
`interconnection_request_date`	date	Original interconnection request date
`operating_date`	date	Expected/actual commercial operation date
`proposed_online_date`	date	Originally proposed online date
`current_online_date`	date	Current expected online date
`withdrawn_date`	date	Date project was withdrawn (if applicable)
`withdrawal_reason`	string	Reason for withdrawal (if provided by CAISO)
`suspension_status`	string	Current suspension status (if applicable)

Location

Field	Type	Description
`state`	string	State code (CA=89%, NV=5%, AZ=4%, MX=1%)
`county`	string	County name where project is located

Study Process & Interconnection

Field	Type	Description
`study_process`	string	CAISO study process designation (e.g., “C06”)
`feasibility_study_status`	string	Feasibility study completion status
`system_impact_study_status`	string	System Impact Study status
`facilities_study_status`	string	Facilities Study completion status
`optional_study_status`	string	Optional study status
`interconnection_agreement_status`	string	Interconnection Agreement execution status

Grid Connection & Deliverability

Field	Type	Description
`deliverability_status`	string	Full Capacity, Energy Only, or Partial Capacity
`tpd_allocation_percentage`	number	Transmission Plan Deliverability (TPD) allocation %
`off_peak_deliverability`	string	Off-peak deliverability designation
`voltage_kv`	number	Interconnection voltage level in kV
`station_transmission_line`	string	Point of interconnection description
`study_area`	string	CAISO study area designation (typically null)
`utility`	string	Participating Transmission Owner (PTO) utility
`pto_study_region`	string	PTO study region (if applicable)

Developer Information

Field	Type	Description
`developer`	string	Developer name from Cleanview enrichment (limited coverage)
`interconnecting_entity`	string	Always null - not provided by CAISO

Technical Details

Field	Type	Description
`original_type_number`	integer	Original CAISO type classification number

Data Updates: CAISO queue data is updated weekly. The API reflects the most recent queue data available from CAISO’s public reports.

Field Availability: Due to the nature of the CAISO interconnection queue, the interconnecting_entity field is always null. CAISO does not provide interconnecting entity information in their queue data. Use station_transmission_line for interconnection point details.

Missing Coordinates: CAISO data does not include latitude/longitude coordinates. For location analysis, use the county and state fields or the station_transmission_line for grid connection points.

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 (CA, NV, AZ)

technology

string

Filter by technology type

min_capacity

number

Minimum capacity in MW

max_capacity

number

Maximum capacity in MW

Response

Successful response with CAISO interconnection queue data

iso

string

Example:

"CAISO"

summary

object

Summary metadata for pagination

Show child attributes

filters

object

Applied filters for the request

data

object[]

Array of interconnection queue records

Show child attributes

Overview

EIA Data

Interconnection Queues

Projects

Overview

Endpoint

Query Parameters

Technology Options

Status Options

Example Requests

Response Schema

Response Fields

Core Identification Fields

Capacity & Technology

Project Status & Dates

Location

Study Process & Interconnection

Grid Connection & Deliverability

Developer Information

Technical Details

Authorizations

Query Parameters

Response

Overview

EIA Data

Interconnection Queues

Projects

​Overview

​Endpoint

​Query Parameters

​Technology Options

​Status Options

​Example Requests

​Response Schema

​Response Fields

​Core Identification Fields

​Capacity & Technology

​Project Status & Dates

​Location

​Study Process & Interconnection

​Grid Connection & Deliverability

​Developer Information

​Technical Details

Authorizations

Query Parameters

Response

Overview

Endpoint

Query Parameters

Technology Options

Status Options

Example Requests

Response Schema

Response Fields

Core Identification Fields

Capacity & Technology

Project Status & Dates

Location

Study Process & Interconnection

Grid Connection & Deliverability

Developer Information

Technical Details