PACE Wisconsin
PACE financing is a program that provides low-cost loans for energy efficiency, renewable energy and water conservation project. A variety of property types are eligible for PACE financing, including commercial, multi-family, non-profit and industrial uses.
Focus on Energy 
Focus on Energy is a state-level energy efficiency and renewable resource program aimed at promoting the economic benefits of smart energy decisions. Focus on Energy provides a host of incentives for businesses, commercial/industrial customers and new construction projects.
Other Resources
Wisconsin's Public Service Commission Office of Energy Innovation maintains a list of other funding resources for sustainability and energy related projects.