In Cottage Grove, Minnesota, the city has established a Low-Density Residential District “where all public services, utilities and amenities needed for urban residential development are available” and development densities do not exceed five dwelling units per gross acre. Cottage Grove does permit density bonuses in this District between 0-5% if applicants demonstrate innovative energy conservation efforts, including orientation of lost for maximum use of passive solar energy and preservation of solar access for active solar energy systems. Solar energy systems incidental to the principal structure are also permitted as an accessory use in all business districts.