The Northern Indiana Public Service Company, a natural gas and electric-power provider, plans to invest $5 billion in environmental upgrades and transmission line work over the next decade. With some projects under way already, as many as 1,000 construction trade workers will be on the job, according to Jimmy Staton, NIPSCO's chief executive officer. "It's just another opportunity; it's another way. We feel like we are helping to create jobs in this economy," Staton said. The company may also build a combined cycle gas turbine plant in the next two years for an estimated $800 million.