generated: '2026-07-27'
method: searched
source: https://www.iso-ne.com/participate/support/web-services-data
also_sourced_from:
- https://webservices.iso-ne.com/docs/v1.1/ns0.xsd
- https://www.iso-ne.com/ws/wsclient -> /locations/all.json (anonymous, 2026-07-27)
description: Controlled vocabularies used as path parameters and enumerated values by the ISO New England
  Web Services API v1.1. Every term below is published by ISO New England - the parameter tables on the
  Web Services Data page ("Parameters and Formats for ISO Web Services", last updated May 2026 - Added
  Batteries Fuel Category), the xs:simpleType enumerations in the published ns0.xsd, or the live /locations/all
  feed. Nothing is invented; lists marked partial are the published examples, not the full registry.
vocabularies:
- name: Day parameter
  format: yyyymmdd
  example: '20140702'
  applies_to: day path parameter
- name: Month parameter
  format: yyyymm
  example: '201312'
  applies_to: month path parameter
- name: Year parameter
  format: yyyy
  example: '2013'
  applies_to: year path parameter
- name: Load Zone
  format: nnnn
  complete: true
  terms:
  - id: 4000
    name: Hub
  - id: 4001
    name: Maine Load Zone
  - id: 4002
    name: New Hampshire Load Zone
  - id: 4003
    name: Vermont Load Zone
  - id: 4004
    name: Connecticut Load Zone
  - id: 4005
    name: Rhode Island Load Zone
  - id: 4006
    name: Southeastern Massachusetts Load Zone
  - id: 4007
    name: Western/Central Massachusetts Load Zone
  - id: 4008
    name: Northeastern Massachusetts Load Zone
- name: Dispatch Zone
  format: nnnn
  complete: true
  terms:
  - id: 7500
    name: Eastern CT
  - id: 7501
    name: Northern CT
  - id: 7502
    name: Norwalk - Stamford
  - id: 7503
    name: Western CT
  - id: 7504
    name: Bangor Hydro
  - id: 7505
    name: Maine
  - id: 7506
    name: Portland Maine
  - id: 7507
    name: Boston
  - id: 7508
    name: North Shore
  - id: 7509
    name: New Hampshire
  - id: 7510
    name: Seacoast
  - id: 7511
    name: Lower SEMA
  - id: 7512
    name: SEMA
  - id: 7513
    name: Northwest Vermont
  - id: 7514
    name: Vermont
  - id: 7515
    name: Central MA
  - id: 7516
    name: Springfield MA
  - id: 7517
    name: Western MA
  - id: 7518
    name: Rhode Island
- name: External Node
  format: nnnn
  complete: true
  terms:
  - id: 4010
    name: New Brunswick
  - id: 4011
    name: New York Northern AC
  - id: 4012
    name: HQ Phase II
  - id: 4013
    name: HQ - Highgate
  - id: 4014
    name: NY Cross Sound Cable
  - id: 4017
    name: NY Norwalk-Northport
  - id: 4018
    name: NECEC
- name: Reserve Zone
  format: nnnn
  complete: true
  terms:
  - id: 7000
    name: Rest Of System
  - id: 7001
    name: Southwest Connecticut
  - id: 7002
    name: Connecticut
  - id: 7003
    name: NEMA/Boston
- name: Capacity Zone
  format: '[n]nnnn'
  complete: true
  terms:
  - id: 8500
    name: Rest-of-Pool
  - id: 8501
    name: Connecticut
  - id: 8502
    name: NEMA-Boston
  - id: 8503
    name: Maine
  - id: 8504
    name: SEMA/Rhode Island
- name: Interface Name
  complete: true
  terms:
  - id: NY Oakdale 345KV
    name: NY Oakdale 345KV
  - id: NY Central-East
    name: NY Central-East
  - id: NY Oakdale 230KV
    name: NY Oakdale 230KV
  - id: NY Rochester 345KV
    name: NY Rochester 345KV
  - id: PJM 5004/5005
    name: PJM 5004/5005
  - id: PJM Central
    name: PJM Central
  - id: PJM East
    name: PJM East
  - id: PJM West
    name: PJM West
- name: NCPC Type
  complete: true
  terms:
  - id: economic
    name: Economic
  - id: highvar
    name: High VAR
  - id: var
    name: VAR
  - id: gpa
    name: GPA
  - id: extloceconomic
    name: External Location Economic
  - id: lscpr
    name: LSCPR
  - id: rrp
    name: Rapid Response Pricing Opportunity Cost
  - id: dloc
    name: Dispatch Lost Opportunity Cost
- name: Fuel Category (Rollup)
  complete: true
  note: Batteries added May 2026.
  terms:
  - id: Batteries
    name: Batteries
  - id: Coal
    name: Coal
  - id: Hydro
    name: Hydro
  - id: Natural Gas
    name: Natural Gas
  - id: Nuclear
    name: Nuclear
  - id: Oil
    name: Oil
  - id: Renewables
    name: Renewables
- name: Bid Type
  complete: true
  terms:
  - id: FIXED
    name: Fixed Demand Bid
  - id: PRICE
    name: Price Sensitive Demand Bid
  - id: DEC
    name: Decrement (virtual demand) Bid
  - id: INC
    name: Increment (virtual supply) Offer
- name: ARA (Annual Reconfiguration Auction)
  complete: true
  terms:
  - id: ARA1
    name: First annual reconfiguration auction (FCA 6 and following)
  - id: ARA2
    name: Second annual reconfiguration auction
  - id: ARA3
    name: Third annual reconfiguration auction
- name: CP (Commitment Period)
  format: nnnn-nn
  example: 2010-11 (FCA1 commitment period)
- name: Market Type
  complete: true
  terms:
  - id: DA
    name: Day-Ahead Market
  - id: RT
    name: Real-Time Market
- name: Outage Type
  complete: true
  terms:
  - id: short-term
    name: Short-Term Outages
  - id: long-term
    name: Long-Term Outages
- name: Equipment Type
  complete: true
  terms:
  - id: Breaker
    name: Breaker
  - id: Line
    name: Line
  - id: PowerTransformer
    name: Power Transformer
- name: Company (control centre)
  complete: true
  terms:
  - id: CMP_CC
    name: Central Maine Power Control Center
  - id: CONVEX_CC
    name: Convex Control Center (Northeast Utilities)
  - id: ME_CC
    name: Maine Control Center
  - id: NH_CC
    name: New Hampshire Control Center
  - id: NSTAR_CC
    name: NSTAR Control Center
  - id: NYISO_CC
    name: New York ISO Control Center
  - id: PSNH_CC
    name: Public Service of New Hampshire Control Center
  - id: REMVEC_CC
    name: REMVEC Control Center (National Grid)
  - id: VELCO_CC
    name: Vermont Electric Power Control Center
- name: Flags
  complete: true
  terms:
  - id: Eco
    name: Economic Flag
  - id: Mto
    name: Major Transmission Outage Flag
  - id: Ovr
    name: Overrun Flag
- name: Status
  complete: true
  terms:
  - id: Approved
    name: Approved
  - id: Implemented
    name: Implemented
  - id: Interim Approved
    name: Interim Approved
  - id: Negotiate
    name: Negotiate
  - id: Preliminary
    name: Preliminary
  - id: Study
    name: Study
  - id: Submitted
    name: Submitted
- name: Request Type
  complete: true
  terms:
  - id: Emergency
    name: Emergency
  - id: Forced
    name: Forced
  - id: Long Term
    name: Long Term
  - id: Opportunity
    name: Opportunity
  - id: Short Term
    name: Short Term
- name: Station
  complete: false
  note: ISO New England publishes only these examples on the parameters page and points to the /outages/stations
    endpoint for the complete listing.
  terms:
  - id: AGAWAM
    name: Agawam
  - id: CHSTRSVC
    name: Chester Static Var Compensator
  - id: MERIMACK
    name: Merrimack
  - id: NORTHFLD
    name: Northfield
  - id: STONY_HL
    name: Stony Hill
  - id: WALTHAM
    name: Waltham
- name: Report Type
  complete: true
  terms:
  - id: final
    name: Final data
  - id: prelim
    name: Preliminary data
- name: Location Type
  complete: true
  source: xs:simpleType type_LocationType in ns0.xsd and the live /locations/all feed
  terms:
  - id: NETWORK AREA
    name: NETWORK AREA
    count_in_locations_feed: 0
  - id: LOAD ZONE
    name: LOAD ZONE
    count_in_locations_feed: 8
  - id: NETWORK NODE
    name: NETWORK NODE
    count_in_locations_feed: 1190
  - id: HUB
    name: HUB
    count_in_locations_feed: 1
  - id: HUB NODE
    name: HUB NODE
    count_in_locations_feed: 32
  - id: RELIABILITY REGION
    name: RELIABILITY REGION
    count_in_locations_feed: 8
  - id: EXT. NODE
    name: EXT. NODE
    count_in_locations_feed: 7
  - id: RESERVE ZONE
    name: RESERVE ZONE
    count_in_locations_feed: 3
  - id: SYSTEM
    name: SYSTEM
    count_in_locations_feed: 1
  - id: INT. AREA
    name: INT. AREA
    count_in_locations_feed: 1
  - id: EXT. AREA
    name: EXT. AREA
    count_in_locations_feed: 5
  - id: DISPATCH ZONE
    name: DISPATCH ZONE
    count_in_locations_feed: 19
  - id: CAPACITY ZONE
    name: CAPACITY ZONE
    count_in_locations_feed: 7
  - id: DRRAZ
    name: DRRAZ
    count_in_locations_feed: 20
  - id: DRR AGGREGATION ZONE
    name: DRR AGGREGATION ZONE
    count_in_locations_feed: 0
location_registry:
  source: /locations/all.json observed anonymously 2026-07-27
  total_locations: 1302
  by_type:
    INT. AREA: 1
    EXT. AREA: 5
    NETWORK NODE: 1190
    HUB: 1
    LOAD ZONE: 8
    EXT. NODE: 7
    HUB NODE: 32
    SYSTEM: 1
    RESERVE ZONE: 3
    DISPATCH ZONE: 19
    DRRAZ: 20
    CAPACITY ZONE: 7
    RELIABILITY REGION: 8
  full_data: examples/iso-new-england-locations_all.json
  note: Some internal nodes have, by rule, opted out of publishing - ISO New England says the /locations
    endpoint is the authority.
  load_zones:
  - id: 4001
    name: .Z.MAINE
  - id: 4002
    name: .Z.NEWHAMPSHIRE
  - id: 4003
    name: .Z.VERMONT
  - id: 4004
    name: .Z.CONNECTICUT
  - id: 4005
    name: .Z.RHODEISLAND
  - id: 4006
    name: .Z.SEMASS
  - id: 4007
    name: .Z.WCMASS
  - id: 4008
    name: .Z.NEMASSBOST
  capacity_zones:
  - id: 8500
    name: Rest-of-Pool
  - id: 8501
    name: Connecticut
  - id: 8502
    name: NEMA-Boston
  - id: 8503
    name: Maine
  - id: 8504
    name: SEMA-RI
  - id: 8505
    name: Northern New England
  - id: 8506
    name: Southeast New England
  reserve_zones:
  - id: 7001
    name: SWCT
  - id: 7002
    name: CT
  - id: 7003
    name: NEMABSTN
  external_nodes:
  - id: 4010
    name: .I.SALBRYNB345 1
  - id: 4011
    name: .I.ROSETON 345 1
  - id: 4012
    name: .I.HQ_P1_P2345 5
  - id: 4013
    name: .I.HQHIGATE120 2
  - id: 4014
    name: .I.SHOREHAM138 99
  - id: 4017
    name: .I.NRTHPORT138 5
  - id: 4018
    name: .I.HQMRL_RD345 1