As solar energy has become more popular and cost-effective, this once fringe renewable source is now at the center of an energy turf war in Wisconsin. At issue is a project in which an Iowa-based renewables company wants to partner with the city of Milwaukee to power seven municipal buildings with solar. Eagle Point Solar would help to finance the city’s project, taking advantage of federal tax breaks that local governments do not qualify for. Eagle Point, based in Dubuque, Iowa, is suing the public utility, We Energies, for refusing to connect a series of solar arrays to each other. We Energies says it is simply following the law.