Louisville-area family business is considering the Riverport industrial complex for a proposed $75 million ethanol plant that could produce 50 million gallons of the gasoline supplement a year. For the People LLC, of Corydon, Ind., unveiled the proposed design Tuesday night to Riverport tenants and some of its potential residential neighbors near the site at 8300 Cane Run Road. The meeting was part of the requirements for obtaining planning and zoning approval for the project. The plant would use 60-foot wind turbines, solar panels and a geothermal system to limit outside energy demands. The company projects 60 full-time jobs with an annual payroll of $2 million.