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CAISO · California · Public-record retrospective

Borrego Substation 69 kV: interconnection queue history

442 MW filed. 26 MW built.

GridVision AI ResearchUpdated

Eleven interconnection requests since 2008: 1 reached commercial operation and 10 withdrew.

Built
1
Withdrawn
10
Still in queue
0

The queue record

Every interconnection request the dataset records at this point of interconnection, in filing order.

Interconnection requests recorded at this point of interconnection, with request date, capacity and outcome.
RequestedProjectTechnologyCapacityOutcome
2008-04-07BORREGO STARLIGHT 1Solar75 MWWithdrawn2008-11-21
2008-04-18BORREGO SOLAR ISolar26 MWBuilt2013-02-12 · 4.8 yrs
2008-05-30BORREGO SOLAR 2Solar49.5 MWWithdrawn2009-12-11
2008-06-02GREENLIGHT SOLAR ISolar58.8 MWWithdrawn2008-11-25
2009-03-1620 MW SOLAR PROJECT #1Solar20 MWWithdrawn2013-06-12
2009-08-21FRV PEGASUS SOLAR PROJECTSolar20 MWWithdrawn2010-05-25
2011-03-31EGP SOLAR 1Solar28 MWWithdrawn2012-01-19
2011-03-31BIG HORN 30MW PV PROJECTSolar30 MWWithdrawn2012-02-01
2011-03-31EE BORREGO IISolar45 MWWithdrawn2012-03-13
2011-03-31RE PADRESolar60 MWWithdrawn2012-02-28
2020-04-15CUCKOO ENERGY STORAGEBattery30 MWWithdrawn2020-07-03

What the record shows

  • 416 MW of the 442 MW filed here withdrew, and 26 MW reached commercial operation.
  • The one request that reached operation took 4.8 years from request to commercial operation.
  • The largest request filed here, 75 MW (solar), withdrew 0.6 years after filing.
  • Four requests were filed on 2011-03-31; all of them withdrew.
  • Eight of the 10 withdrawals came within a year of filing.
  • By technology, the requests here were solar 10, battery 1.
  • The dataset records this point of interconnection under five spellings, which are combined here.

What a decision record would have to make explicit

  • What separated the requests that reached operation from those that withdrew, such as study results, upgrade assignments or site conditions, is not in the public queue record, so a decision record here would have to carry it as an unknown.
  • The dataset records outcomes and dates, not reasons, so no cause is attributed to any outcome here.

What this does and does not show

This is a reading of a public dataset, not a customer case study: no engagement, customer or client is involved. The dataset records outcomes — what was built, what withdrew, and when — but not why any project withdrew, so no cause is attributed here. Nothing on this page claims GridVision predicted, influenced or would have changed any outcome, and a pattern at one point of interconnection does not generalise to another.

Source: Lawrence Berkeley National Laboratory, Queued Up: 2026 Edition — project-level interconnection queue dataset. Interconnection requests through year-end 2025. Used under CC BY 4.0; attribution to Lawrence Berkeley National Laboratory and GridTracker.

Related points of interconnection

How the CAISO process works today: CAISO interconnection queue. Comparing candidate nodes for a project? Read how to choose a point of interconnection.

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