<p>El Paso Corp. joined the "back-to-basics" movement among energy firms Wednesday, saying it is slashing its power trading business to limit financial risks and beef up its credit rating.</p>
<p>As the Enron debacle continues to shake confidence in the energy sector among financial ratings agencies, El Paso executives said they are eliminating half the company's trading operation and shifting resources to El Paso's core natural-gas business.</p>