A. Purpose: Cottage Grove supports the use of solar energy systems in appropriate zoning districts within the City. The development of solar energy systems should be balanced with the protection of the public safety and the existing natural resources in Cottage Grove. This Section provides for the regulation of the construction and operation of solar energy systems in Cottage Grove, subject to reasonable conditions to protect the environment, public health, safety, and welfare. The provisions of this Section shall apply within all zoning districts. In no case shall the provisions of this Section guarantee rights to solar access.
B. Definitions: The following words, terms and phrases when used in this Chapter shall have the meaning ascribed to them in this Section except where the context clearly indicates a different meaning.
COMMUNITY SOLAR GARDEN: A solar electric (photovoltaic) array that provides retail electric power (or a financial proxy for retail power) to multiple community members or businesses residing or located off site from the location of the solar energy system, under the provisions of Minnesota Statutes Section 216B.1641.
PHOTOVOLTAIC SYSTEM: An active solar energy system that converts solar energy directly into electricity.
SOLAR COLLECTOR: A device, structure, or a part of a device or structure for which the primary purpose is to capture sunlight and transform it into thermal, mechanical, chemical, or electrical energy.
SOLAR DAYLIGHTING: A device specifically designed to capture and redirect the visible portion of the solar spectrum, while controlling the infrared portion, for use in illuminating interior building spaces in lieu of artificial lighting.
SOLAR ENERGY: Radiant energy received from the sun that can be collected in the form of heat or light by a solar collector.
SOLAR ENERGY DEVICE: A system or series of mechanisms designed primarily to provide heating, cooling, electrical power, mechanical power, or solar daylighting or to provide any combination of the foregoing by means of collecting and transferring solar generated energy into such uses either by active or passive means. Such systems may also have the capability of storing such energy for future utilization.
SOLAR ENERGY SYSTEM: A device or structural design feature, a substantial purpose of which is to provide daylight for interior lighting or provide for the collection, storage, and distribution of solar energy for space heating or cooling, electricity generation, or water heating.
SOLAR ENERGY SYSTEM, GRID INTERTIE: A photovoltaic solar energy system that is connected to an electric circuit served by an electric utility company.
SOLAR ENERGY SYSTEM, GROUND MOUNTED: A freestanding solar energy system mounted directly to the ground using a rack or pole rather than being mounted on a building.
SOLAR ENERGY SYSTEM, OFF GRID: A photovoltaic solar energy system in which the circuits energized by the solar energy system are not electrically connected in any way to electric circuits that are served by an electric utility company.
SOLAR ENERGY SYSTEM, ROOF MOUNTED: A solar energy system mounted onto the roof of a building.
SOLAR FARM: A commercial facility that converts sunlight into electricity, whether by photovoltaic (PV), concentrating solar power devices (CSP), or other conversion technology, for the principal purpose of wholesale sales of generated electricity.
SOLAR HEAT EXCHANGER: A component of a solar energy device that is used to transfer heat from one (1) substance to another, either liquid or gas.
SOLAR HOT AIR SYSTEM: An active solar energy system that includes a solar collector to provide direct supplemental space heating by heating and recirculating conditioned building air.
SOLAR HOT WATER SYSTEM: A system that includes a solar collector and a heat exchanger that heats or preheats water for building heating systems or other hot water needs, including residential domestic hot water and hot water for commercial processes.
SOLAR MOUNTING DEVICES: Racking, frames, or other devices that allow the mounting of a solar collector onto a roof surface or the ground.
C. General Standards. Solar energy systems in accordance with the standards in this Section are allowed as a permitted accessory use in all zoning districts.
1. Wall Mounted Solar Energy Systems: Wall mounted solar energy systems must be flush with the wall and are prohibited facing a public street.
2. Roof-Mounted Solar Energy Systems:
a. Roof mounting devices and roof mounted solar energy systems shall be flush mounted on pitched roofs, parallel to the roofline.
b. Roof-mounted solar energy systems mounted on a flat roof of a building located in a nonresidential district may be mounted at an angle to the roof to improve their efficiency; however, the highest point of a solar collector shall not be more than five feet (5') from the surface of the roof, measured in a straight line above the roof upon which the solar collector is mounted.
c. Roof-mounted solar energy systems shall not extend beyond the exterior perimeter of the building on which the system is mounted or built or as required by Building Code.
d. Exterior piping for solar hot water systems is prohibited to extend beyond the perimeter of the building.
e. Roof-mounted solar energy systems shall comply with the maximum height requirements for the zoning district in which they are located.
f. Roof-mounted solar energy systems shall use colors that blend with the color of the roof.
g. Reflection angles from collector surfaces shall be oriented away from neighboring windows. Where necessary, screening may be required to address glare.
3. Ground-Mounted Solar Energy Systems:
a. Ground mounted solar energy systems may only be erected on properties consisting of five (5) or more acres, regardless of the zoning district in which they are located.
b. Ground mounted solar energy systems shall not exceed fifteen feet (15') in height when oriented at maximum tilt as measured from the ground to the highest point of the solar collector or related appurtenance.
c. Ground-mounted solar energy systems shall comply with the accessory structure setback standards for the applicable zoning district in which they are located, except as otherwise required in this Section. Solar energy systems shall not extend into the minimum front, rear, or side yard setbacks when oriented at minimum or maximum design tilt.
d. Ground-mounted solar energy systems are prohibited in the front yard of properties located within the MUSA. Ground mounted solar energy systems are permitted in the front yard of properties located outside the MUSA, but must comply with the minimum front yard setback as required in the zoning district they are located in or such greater distance as may be required in this Section.
4. Heliostats: Heliostats are prohibited in all zoning districts.
D. Additional Requirements:
1. Public Easements: Solar energy systems shall not encroach on public drainage or utility easements.
2. Glare: Solar collectors shall be placed and arranged such that reflected solar radiation or glare shall not be directed onto adjacent buildings, properties, or roadways, and shall not emit unreasonable glare as determined by City Staff.
3. Building Permit Required: All solar energy systems require a building permit. A building permit application and plan submittal must comply with the following requirements:
4. Applications for Solar Energy Systems: An application to the City for a building permit under this Section shall contain information, including, but not limited to, the following:
a. A building permit application.
b. A site plan of existing and proposed site conditions.
c. Description and depiction of solar energy system.
d. Number of solar collectors to be installed.
e. Location and spacing of solar collectors and mounting devices.
f. Applications for ground mounted solar energy systems shall identify existing vegetation on the installation site (list vegetation type and percent of coverage; i.e., grassland, plowed field, wooded areas, etc.), and provide a maintenance plan for controlling vegetative growth on site upon installation of the solar energy system.
g. A description of the method of connecting the solar collectors to a building or substation and a signed copy of the interconnection agreement with the local electric utility shall be included or a written explanation outlining why an interconnection agreement is not required.
h. Planned location of underground or overhead electric lines connecting the solar energy system to the substation or distribution line.
i. New electrical equipment other than at the existing building or substation that is the connection point for the solar energy system.
j. Manufacturer’s specifications and recommended installation methods for all major equipment, including solar collectors, mounting systems and foundations for poles or racks. The City reserves the right to deny a building permit for proposed solar energy systems deemed to have inadequate certification.
k. Existing and proposed (if existing grade will be altered) topography at two foot (2') contours.
l. A completed glare study that demonstrates that there will be no unreasonable glare generated by the solar energy system and that any glare generated shall not be directed onto adjacent buildings, properties, or roadways or otherwise adversely impact neighboring properties as deemed necessary by City Staff.
5. Grid Interties: For all grid intertie solar energy systems, all power lines shall be placed underground within the interior of each parcel and between the solar energy system and its connection to the electric grid. The collection system may be placed overhead near substations or points of interconnection to the electric grid. All grid intertie systems shall have an agreement with the local utility prior to the issuance of a building permit. A visible external disconnect must be provided if required by the utility. Off grid systems are exempt from this requirement.
6. Special Exceptions: Solar collectors and solar energy systems with a cumulative area of six (6) square feet or less are permitted in all zoning districts and are exempt from the provisions of this Section. Examples of these systems include outdoor accent lighting systems, power supply for traffic control systems, powering a water pump for water gardens, telecommunication systems, backup power systems during power outages, and similar solar energy systems, as long as the system has a cumulative area of six (6) square feet or less.
E. Community Solar Gardens and Solar Farms: Community solar gardens and solar farms are permitted with an interim use permit subject to the following requirements:
1. Ground Mounted Community Solar Gardens and Solar Farms: Ground mounted community solar gardens and solar farms are permitted only in those areas shown on Exhibit A in Resolution 985 on file in the City, and must comply with the following requirements:
a. A minimum of five (5) acres of land is required. All ground mounted solar energy systems and solar collection appurtenant equipment must set back a minimum of three hundred feet (300') from all property boundary lines.
b. Vegetative screening and buffering of the ground-mounted solar energy systems will be required as part of the conditions of approval. Screening may include walls or fences.
c. The electrical connection systems shall be placed underground within the interior of each parcel and between the solar energy system and the point where the interconnection to the electric grid is made.
2. Roof Mounted Community Solar Gardens and Solar Farms: Roof mounted community solar gardens and solar farms are permitted on flat roofs on principal structures in all zoning districts regardless of lot size, and must comply with the following requirements:
a. All feeder lines and grid interties shall be placed underground between the solar energy system and the point where the interconnection to the electric grid is made. The collection system may be placed overhead near substations or points of interconnection to the electric grid.
b. Roof-mounted systems shall comply with all building setbacks in the applicable zoning district and shall not extend beyond the exterior perimeter of the building on which the system is mounted or as required by Building Code.
c. Roof-mounted solar energy systems must abut an existing electric distribution system for purposes of making the interconnection to the electric grid.
d. Solar energy systems are allowed on flat roofs on accessory structures only in non-residential zoning districts.
e. Solar collectors mounted on flat roofs on principal and accessory structures in non-residential zoning districts may be mounted at an angle, but no portion of the solar collector may extend more than five feet (5') above the surface of the flat roof.
F. Decommissioning: A decommissioning plan shall be submitted with all applications for community solar gardens or solar farm systems.
1. Decommissioning plans shall outline the anticipated means and cost of removing the solar energy system at the end of its serviceable life or upon the discontinuation of its use. The cost estimates shall be made by a competent party, such as professional engineer, a contractor capable of decommissioning the system, or a person with suitable expertise or experience with decommissioning. The plan shall also identify the financial resources that will be available to pay for the decommissioning and removal of the system. Owners of solar energy systems may rely on manufacturer’s data to submit estimates.
2. Decommissioning of the system must occur within ninety (90) days from either of the following:
a. The end of the system’s service life; or
b. The system becomes a discontinued use.
3. A system shall be considered a discontinued use after one (1) year without energy production, unless a plan is developed during the year the system is discontinued and submitted to the Zoning Administrator outlining the steps and schedule for returning the system back into service.
4. The City may, at its discretion, require the owner and/or operator of the solar energy system to provide financial security in the form of a cash escrow, bond, or irrevocable letter of credit in an amount equal to one hundred twenty-five percent (125%) of a cost estimate for decommissioning the system.
5. The owner of the property where a community solar garden or solar farm is located must notify the City in writing when feeder lines and/or grid interties are disconnected from the local utility transmission line.
G. Abandonment: If a solar energy system remains nonfunctional or inoperative for a continuous period of one (1) year, the system shall be deemed to be abandoned and shall constitute a public nuisance. The owner shall remove the abandoned system at its expense after a demolition permit has been obtained. Removal shall include removal of the entire solar energy systems, including all solar collectors, mounting structures, and related components.