California ISO orders second day of rotating outages

By the OGJ Online Staff

HOUSTON, May 8, 2001 — With demand running above forecasts, the California Independent System Operator ordered utilities to shed 400 MW of firm load in rotating outages at midafternoon Tuesday for the second straight day.

The grid operator said the length of the blackouts will be evaluated on an hourly basis and called for conservation to lessen the impact.

During a briefing, director of grid operations Jim McIntosh said demand was up about 1,000 MW over Monday thanks to a heat wave and accompanying air conditioning use.

"The main thing is load is running higher," he said, and there is not enough supply in California to satisfy demand. He said the state is receiving about 5,600 MW of imports.

Southern California Edison Co. said it began cutting load immediately after the ISO's request to prevent a potential widespread disturbance to California's electric transmission grid.

The company said the order was being accomplished by taking groups of circuits out of service on a rotating basis. The initial groups include 71,000 customers in small portions of 59 cities, among them Long Beach, Tulare, Yucaipa, San Marino, Newport Beach, Palm Desert, Santa Monica, and San Bernardino. The outages were expected last up to 1 hour for affected customers, but could be shorter or longer in duration, depending upon circumstances.

If necessary, the process will be repeated with the interruption of a different set of widely scattered circuits each hour until the ISO can sustain reserve levels above 1.5% of energy demand.

Earlier in the day, the ISO issued a Stage 1 emergency indicating reserves were below 7%. A heat spell, including a record 93° in San Francisco, has caused a surge in air conditioning use, McIntosh said. Meanwhile, total of 12,088 MW worth of generation remains unavailable with power plants off line for maintenance and plant malfunctions.

Four nuclear units are off line in the western US for refueling or repairs. In addition, McIntosh said an additional 2,000 MW of generation from the state's qualifying facilities (QFs) is unavailable. Peak demand on the transmission system is expected to reach 34,469 MW about 4 p.m. Tuesday.

More than 88,000 California customers of Southern California Edison and Pacific Gas & Electric Co. were without power for about an hour late Monday afternoon. McIntosh had said he believed the ISO would be able to get through the day without having to ask utilities to cut firm load, but demand stayed stronger than expected throughout the day.

Since January, the ISO has ordered blackouts Jan. 17-18 and Mar. 19-20.

Sponsored by FLSmidth
Recommend this article Recommend this article () You recommended this article You recommended this article ()
Follow Power Engineering on Twitter

Products Showcase

Dynamic Fluoride Ion cleaning DFIC of industrial natural gas turbines Hi-Tech Furnace Systems

Dynamic Fluoride Ion Cleaning of IGT Parts

The Dynamic Fluoride Ion Cleaning (DFIC) Process from Hi-Tech Furnace Systems is able to clean deep, narrow cracks of oxides by cycling between negative, atmospheric, and positive pressure.

Latest News

Shutterstock coal production trucks

Weekly Coal Production

The Weekly Coal Production shows how much coal is being produced across the U.S.

Federal Reserve Bank of Dallas Weekly Economic Indicators financial business

The Federal Reserve Bank of Dallas' Economic Indicators

The Federal Reserve Bank of Dallas offers a glimpse into how the markets are doing domestical...

Kvaerner awarded contract for gas-fired power plant in Delaware

Kvaerner North American Construction Inc. and its joint venture partner, Parsons Brinckerhoff...

Canadian Solar purchases two solar projects

Canadian Solar Inc. has acquired a majority interest in two utility-scale solar power project...

Operators Restart Unit 2 at PPL Susquehanna

Unit 2 at the PPL Susquehanna nuclear power plant near Berwick, Pa. resumed generating electr...

Settlement agreement limits cost recovery at Edwardsport

The Indiana Utility Regulatory Commission (IURC) on Dec. 27 modified and approved a settlemen...

Toshiba in talks to sell portion of Westinghouse nuclear unit

Toshiba Corp is in talks  to sell up to 16% of its stake in the Westinghouse Electric Co...

Utah nixes nuclear waste storage facility

Plans to park radioactive waste at a storage facility in Utah have been officially called off.

Archived Articles

2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013

Current Magazine Issue

Volume 117, Issue 8

Buyers Guide Company Listings

Southern California Edison

Specializes in analysis of ion-exhange resin, chemical cleaning solvents, cooling water, wastewater, ultrapure water, bulk chemicals, boiler tube deposits, and more.

Power Industry Wire News

Choose Energy Reaches Major Milestone Sourcing 2.2 Billion Kilowatt-Hours of Energy for Customers

Choose Energy Reaches Major Milestone Sourcing 2.2 Billion Kilowatt-Hours of Energy for...

Daybreak Oil and Gas, Inc. Provides Operational Update

Daybreak Oil and Gas, Inc. Provides Operational Update

Academics Weigh In on Key Advantages of Natural Lawns

Academics Weigh In on Key Advantages of Natural Lawns

Eco-Shift Power Corp Announces Push Into the Texas Auto Market With an Agreement to Retrofit Six Auto Malls

Eco-Shift Power Corp Announces Push Into the Texas Auto Market With an Agreement to Ret...

Retroficiency Names Ed McGlynn as Vice President of Utility Solutions

Retroficiency Names Ed McGlynn as Vice President of Utility Solutions

Power Engineering

Article Archives for Power Engineering Magazine

Continuing Education

Professional Development Hours

To access a course listing associated to a specific topic listed below, click on the topic of choice from the list below.

Latest Energy Jobs

View more Job Listings >>