Transmission providers' own interconnection queues

Period

2001–2024

One row is

request as the provider lists it (edition x provider x the provider's project number), all rows of the edition, in_core_states flagged

Built from source rows of

request as NorthWestern lists it: one row per project number, the serial process's generation requests and the four cluster requests the sheet also lists

Evidence and method

reported · directA request for interconnection service, not a plant, as NorthWestern lists it on the workbook's UPDATED date. The status is NorthWestern's word (Withdrawn, In Service, Suspended, In Construction, Active - Contract Negotiations, Signed Agreement, Active), kept beside the common outcome. The workbook dates the request only: its In Service Date column does not say whether a date is requested or achieved, so no operation date is taken from it. MW is the Summer Output (MW) column, with Winter Output (MW) kept beside it; a requester's figure, never capacity. The location is free text: a state is taken only where it ends with Montana, MT, South Dakota or SD, and otherwise stays null. Rows carry NorthWestern's own project numbers, the numbers LBNL's compilation uses for provider NWMT; the two accounts are related by that number and never merged or name-matched. The TRANSITIONAL CLUSTER sheet (four rows repeated from the generation sheet) and the QUEUE-LINE INTERCONNECT sheet (transmission-line requests) are not read. OATI serves OASIS under its own certificate authority, whose root is in neither the Mozilla (certifi) nor the macOS system trust store (checked 2026-09-28), so a browser may warn before opening the file.

Origin

Pre-Cluster Serial Interconnection Queue (Serial_Interconnection_Queue.xlsx), sheet QUEUE-GENERATION INTERCONNECT, updated 2026-09-24Source notice and licenceLicence: No licence or reuse terms stated on the posting or in the workbook; OATI's OASIS Access Limitations govern automated access to the node

Edition in this release

UPDATED 2026-09-24 (sheet QUEUE-GENERATION INTERCONNECT, cell B1); OASIS document tree 'Updated: 2026-09-24 16:51 CS'; HTTP Last-Modified Thu, 24 Sep 2026 22:51:23 GMT; retrieved 2026-09-28T11:20:23Z · · retrieved 2026-09-28

Download

NorthWestern Energy's Pre-Cluster Serial Interconnection Queue on its OASIS node ↗The atlas reads this workbook and publishes counts and outcomes from it; it publishes no copy of it and no table of its rows. NorthWestern replaces the file in place, so the link serves its current edition. OATI's certificate authority is not in common browser trust stores, so a browser may warn first.

• Listed without a reported value · mwRows with no value for this measure; published as null, never zero
  9 requests
• Listed without a reported value · days request to observationRows with no value for this measure; published as null, never zero
  0 requests
• Not applicable · days request to observationRows where outcome IN ('active', 'suspended') is false and that carry no value; the measure does not apply to them
  416 requests
• In the source, not yet includedNorthWestern's TRANSITIONAL CLUSTER sheet, which repeats four rows of the generation sheet, and its QUEUE-LINE INTERCONNECT sheet of transmission-line requests; its CTS and master queue workbooks posted beside this one; and the other five OATI providers' queues (PacifiCorp, PGE, Idaho Power, PSE, Avista).
  Not computedone provider's generation queue is read

Publisher

NorthWestern replaces the workbook in place under a stable file name and states no schedule. On the checked date its OASIS document tree stamped the file "Updated: 2026-09-24 16:51 CS" and the workbook's own cell B1 read UPDATED 2026-09-24.www.oasis.oati.com/websmartoasis/HomePage/GetData ↗www.oasis.oati.com/woa/docs/NWMT/NWMTdocs/Serial_Interconnection_Queue.xlsx ↗

Delay

Not stated: NorthWestern states no delay between a status change and the posting

This atlas

One edition pinned by hash and read from the archive; a newer edition is pinned as a new source beside it, so earlier editions stay. Requests to OATI are paced at least one second apart, never retried, and at most one refresh per provider per day, as stated to OATI on 2026-09-27. No timed refresh.www.oasis.oati.com/woa/docs/NWMT/NWMTdocs/Serial_Interconnection_Queue.xlsx ↗

• keys.queue_request_provider_unique{"duplicates":0,"rows":451}
  Passed
• queue.outcome_vocabulary_closed{"outside":[],"unknown_by_status":[],"vocabulary":["active","decommissioned","operational","suspended","unknown","withdrawn"]}
  Passed
• queue.elapsed_requires_both_dates{"elapsed_without_both_dates":0}
  Passed
• queue.provider_accounts_recorded{"editions":{"nwmt-queue-20260924":{"by_outcome":{"active":19,"operational":73,"suspended":16,"withdrawn":343},"current_edition":true,"edition_date":"2026-09-24","mw_not_a_number":9,"provider":"NWMT","rows":451,"sheets_not_read":{"QUEUE-LINE INTERCONNECT":"transmission-line interconnection requests, not generation","TRANSITIONAL CLUSTER":"repeats four rows of the generation sheet (455, 457, 464, 465) with the same statuses"},"unknown_statuses":[],"without_request_date":0,"without_state":17}},"matches":{"by_provider":{"NWMT":{"by_basis":{"issuer_request_number":429},"lbnl_only":0,"lbnl_rows":429,"mw_disagree":1,"outcomes_disagree":19,"pairs":429,"provider_only":22,"provider_only_in_core_states":3,"provider_rows":451,"request_date_apart_over_30_days":0,"requests_with_several_candidates":0}},"rows":429}}
  Passed

No corrections apply to this dataset in this release. Earlier editions: not available (earlier releases did not retain per-dataset edition comparisons).