JEFFERSON CITY, Mo. (AP) — Ameren Missouri customers wouldn't likely see a significant increase in their monthly electricity bills under a proposal allowing manufacturers that use a lot of electricity to negotiate lower rates, according to a Missouri Public Service Commission staff analysis presented to a Senate committee Thursday. The proposal, which passed the committee on a 10-1 vote, is designed to bring an estimated 500 jobs to southeastern Missouri by allowing metal manufacturers that use a lot of electricity to negotiate lower rates for a longer contract than is allowed under current law. Supporters hope it will help secure hundreds of jobs by attracting a new steel mill owned by an Indian company.