Ownership by MEHC

On March 21, 2006, MidAmerican Energy Holdings Company (“MEHC”) completed its purchase of all of PacifiCorp’s outstanding common stock from PacifiCorp Holdings, Inc. (“PHI”), a subsidiary of Scottish Power plc (“ScottishPower”). PacifiCorp’s common stock was directly acquired by a subsidiary of MEHC, PPW Holdings LLC. As a result of this transaction, MEHC controls the significant majority of PacifiCorp’s voting securities, which also include preferred stock held by unrelated third parties. MEHC, a global energy company based in Des Moines, Iowa, is a majority-owned subsidiary of Berkshire Hathaway Inc....