By Deborah Austin U.S. companies that have stayed with their current energy suppliers are more satisfied than those who switched to get lower prices, says a national survey by RKS Research & Consulting. Those who stuck with providers give them higher marks on all major performance aspects -- including cost savings, customer service, billing, and usage information. But those who switched to save money expressed the lowest satisfaction level on all performance levels besides costs -- and said even those savings fell short of expectations. One in five U.S. businesses now can choose their electric supplier, says the survey. Of those, about 71% have chosen to stay with their present provider. Among key accounts -- larger firms with multiple sites and monthly electric bills of more than $2 million -- one in four have such a choice, and only 56% of those have kept their current provider. Headquartered in North Salem, N.Y., RKS Research does market research and public opinion polling for energy and natural resource organizations.