In a move that could shake up the American solar industry, General Electric plans to announce on Thursday that it will build the nation's largest photovoltaic panel factory, with the goal of becoming a major player in the market. "For the past five years, we've been investing extremely heavily in solar," said Victor Abate, vice president for G.E.'s renewable energy business. "Going to scale is the next move." The plant, whose location has not been determined, will employ 400 workers and create 600 related jobs, according to G.E. The factory would annually produce solar panels that would generate 400 megawatts of energy, the company said, and would begin manufacturing thin-film photovoltaic panels made of a material called cadmium telluride in 2013. While less efficient than conventional solar panels, thin-film photovoltaics can be produced at a lower cost and have proven attractive to developers and utilities building large-scale power plants. G.E. has signed agreements to supply solar panels to generate 100 megawatts of electric power to customers, including a deal for panels generating 60 megawatts with NextEra Energy Resources.