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RELIEVING TRANSMISSION CONSTRAINTS

 

An Overview in Response to AB 970

Prepared by the
California Public Utilities Commission
Energy Division
March 12, 2001

 

From the Report's EXECUTIVE SUMMARY

AB 970 requires the California Public Utilities Commission to identify constraints in California's transmission and distribution system and to take actions to remove them.

This report identifies constraints, and utility projects underway or planned to mitigate them either by 2001 or between 2002-2005.*

This report identifies 51 constraints on California's transmission and distribution system that either exist now, or will exist by summer 2001. This report also identifies an additional 107 constraints that will affect the system's reliability from 2002 to 2005.

This report recommends that in year 2001, utilities should complete 31 projects, costing $120 million, to address 38 of the 51 constraints. Twenty-seven of these projects should be completed by summer 2001. (The other four have later completion dates.) These projects increase system capacity to allow more energy to flow to consumers, improve system reliability by making the system more stable, and/or allow access to a wider range of generation sources, some of which may supply cheaper power.

These projects increase capacity by more than 3,000 megawatts (MW). Benefits are not strictly additive, however, because most of the projects affect a specific local area rather than the system as a whole and relieving one constraint can shift power flows to other parts of the system that may become new constraints. On the other hand, many projects provide benefits, such as a reduced chance of outages or an improvement in local voltage, that are not measurable in megawatts. The benefits of individual projects, including capacity increases where relevant, are discussed in more detail in two sections of this report, Short-Term Transmission System Constraints and Projects and Long-Term System Constraints and Projects, and in Appendix D.

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* This report was originally released on February 13, 2001, and revised in response to comments.

  

Last Modified: 10/17/2007


 
 
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