A power company with a plant in Petersburg is planning to spend more than half a billion dollars and bring several jobs to the Tri-State. Indianapolis Power & Light Company is planning upgrades as part of its effort to meet new federal mercury rules. If the Indiana Utility Regulatory Commission approves IPL's plans, construction could begin later this year at the company's Petersburg plant. The project is expected to bring 350 to 400 construction jobs to the southwestern Indiana region. The utility plans to spend $511 million on upgrades at the Petersburg power plant and a second plant on Indianapolis' south side.