A top California regulator told Congress today that the Enron Corporation engaged in sham transactions in late 2000 that drove up electricity prices and helped worsen the energy crisis that plagued the West for more than a year. Testifying to a subcommittee of the Senate Commerce Committee, Loretta Lynch, president of the California Public Utilities Commission, said regulators had studied Enron's actions in the fourth quarter of 2000 and had determined that five subsidiaries traded large volumes of electricity contracts among themselves in an effort to push up prices. Ms. Lynch said the effect of the trading was to set...