WASHINGTON – Two energy companies facing the loss of their ability to sell electricity on the open market have acknowledged improper behavior by some of their traders during California's power crisis and say they have fired them. However, in filings with federal regulators this week, Reliant Energy and BP Energy asserted that the traders' activities had no impact on the Western power market and did no harm to consumers. The companies said revoking their authority to sell wholesale power at market rates would be an overly harsh punishment that would send shock waves through an already-fragile industry. California officials scoffed...