In the midst of the California energy troubles in early 2001, when power plants were under a federal order to deliver a full output of electricity, the Enron Corporation arranged to take a plant off-line on the same day that California was hit by rolling blackouts, according to audiotapes of company traders. The tapes and memorandums were made public by a small public utility north of Seattle that is fighting Enron over a power contract. They also showed that Enron, as early as 1998, was creating artificial energy shortages and running up prices in Canada in advance of California's larger experiment with deregulation. The tapes provide new details of market manipulation during the California energy crisis that produced blackouts and billions of dollars of surcharges to homes and businesses on the West Coast in 2000 and 2001. In one January 2001 telephone tape of an Enron trader the public utility identified as Bill Williams and a Las Vegas energy official identified only as Rich, an agreement was made to shut down a power plant providing energy to California. The shutdown was set for an afternoon of peak energy demand. The next day, Jan. 17, 2001, as the plant was taken out of service, the State of California called a power emergency, and rolling blackouts hit up to a half-million consumers, according to daily logs of the western power grid. Officials with the Snohomish County Public Utility District in Washington State, which released the tapes, said they believed Enron officials had taken similar measures with other power plants. This tape, they said, was proof of what was going on.