Central california clean energy transmission project
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Central California Clean Energy Transmission Project. PCC Meeting Vancouver, BC October 24, 2007. Alternatives Considered. Alt-1: Build a Midway – E2 500kV DCTL (Recommended) Alt-2: Build a Midway – E2 500kV SCTL Alt-3: Build a Midway – E2 765kV SCTL

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Central California Clean Energy Transmission Project

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Central california clean energy transmission project

Central California Clean Energy Transmission Project

PCC Meeting

Vancouver, BC

October 24, 2007


Alternatives considered

Alternatives Considered

  • Alt-1: Build a Midway – E2 500kV DCTL (Recommended)

  • Alt-2: Build a Midway – E2 500kV SCTL

  • Alt-3: Build a Midway – E2 765kV SCTL

  • Alt-4: Build a Midway – Gregg 500kV SCTL


Alternative considered but rejected

Alternative Considered but Rejected

  • Build a 2nd Gates – Midway 500kV SCTL and a new Gates – Gregg 230kV DCTL. This alternative is not recommended due to the following reasons:

    • This alternative would require numerous crossing of the existing 500kV and 230kV lines that would therefore have higher probability of multiple 500kV line outages.

    • The Gates – Gregg 230kV DCTL would traverse developed farm lands in the San Joaquin Valley.

    • It would only provide about 500 MW of increased south-to-north transfer capability over Path 15. This is less than half of the transfer capability expected from the other potential alternatives.


Preliminary plan of service

Preliminary Plan of Service

  • Build a 500 kV Double Circuit Tower Line with two 2300 kcmil AAL conductors (bundled),

  • Build a new 500 kV Substation (E2) with two 500/230 kV 1,120 MVA transformer banks,

  • Loop the Helms – Gregg #1 and #2 230 kV lines into the E2 Substation,

  • Build 500 kV line terminations at Midway and E2, and

  • Install additional voltage supports in the Fresno area. The amount and location of the voltage support will be evaluated in a separate voltage stability study.

  • Expected Operation Date: 2Q – 3Q/2013


Potential routes

Potential Routes

  • East Route:

  • ~140 miles

  • Runs along the foothills – less impacts on farm lands, avoid urban areas

  • Potential use of SCE access roads

  • Lower probability of multiple 500 kV line outages than West Route

    • No 500 kV line crossing

Pacific Gas & Electric Company

Bellota

Tesla

New Sub E2

Gregg

Los Banos

San Luis

Helms PSP

Panoche

Moss Landing

Kings River

McCall

PATH 15

C3ET Project– East Route

C3ET Project – West Route

  • West Route:

  • ~180 miles

  • Crosses farm lands and urban areas

  • Lower probability of multiple 500 kV line outages

    • Crosses Four existing 500 kV lines

Gates

Arco

Midway

Morro Bay

Diablo Canyon

PATH 26

To Southern California Edison Company


Central california clean energy transmission project

E2 Substation Location

Kerckhoff-Sanger 115kV lines

Helms PSP

Helms-Gregg 230kV lines

E1 Sub

E2 Sub

Gregg & Herndon

Proposed Midway-E2 500kV line

Sanger

McCall


Potential benefits

Potential Benefits

  • Improve transmission reliability for Yosemite and Fresno Areas.

  • Increase Fresno and Yosemite area import capability to serve local customers.

  • Reduced Local Capacity Requirements in Fresno Area

  • Improve utilization of the existing capability at Helms PSP.

  • Help mitigate potential minimum load and over-generation problems during off-peak conditions.

  • Increase Path 15 transfer capability to avoid potential congestion and increase access to larger population of renewable resources in southern California.

  • Reduce green house gas based on displacement of thermal generation in PG&E area

  • Eliminate the existing Helms Transfer Trip RAS needed for supporting Helms pumping operation.


Preliminary schedule

Preliminary Schedule


Questions

Questions?


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