Also

* San Diego-based Sempra Energy said it might sell or refinance its Texas power-plant holdings to take advantage of rising values for coal-fired electricity generators.

* Viacom Inc. said that it had renamed its Infinity Broadcasting unit CBS Radio.

* MTV Networks has agreed to invest $50 million in privately held Amp’d Mobile and will provide video clips and other content for a wireless service that Amp’d plans to kick off this week.