Wind energy conversion systems shall require a specific use permit (SUP) in all zoning districts and flood plain areas. Large wind energy systems shall be located on a lot having a minimum lot size of five (5.0) acres. All wind energy systems shall be subject to the following additional requirements (unless one or more of the following requirements are specifically waived or modified in the SUP ordinance):
(1) An accurately drawn-to-scale survey/site plan is required with the SUP application and shall include the following:
(A) Property lines and physical dimensions of the property;
(B) Location, dimensions, setbacks and types of existing major structures on the property;
(C) Location of the proposed wind system tower, and setbacks/dimensions from all existing structures on site, from all property lines, and from structures on adjacent properties;
(D) Locations and dimensions/setbacks from all public rights-of-way that are contiguous with the property;
(E) Overhead utility lines, and approximate locations/canopy coverage of large existing trees on the property;
(F) Wind system specifications, including manufacturer and model, rotor diameter, tower height, tower type and rated kW output;
(G) Tower foundation blueprints or drawings;
(H) Tower blueprint or drawing;
(I) Elevation drawings showing the design and height of the proposed energy system, and any screening that will be provided to screen the system tower from public view.
(2) Wind towers and generators proposed to be installed within the 100-year floodplain shall also have approval of the city’s engineer and, where applicable, the U.S. Army Corps of Engineers. Such tower sites shall take such measures, as required by the city’s engineer, to protect the sites from damage from potential flooding. The city’s engineer shall require a floodplain permit and a licensed engineer’s certification that the tower/generator will not pose a threat or safety hazard due to flood conditions.
(3) No portion of the tower structure of a wind energy system shall be located within any required front, side or rear yard, and the tower and all of its appurtenances shall be located behind (i.e., not in front of) the main building unless otherwise authorized (i.e., varied) in the SUP ordinance. No portion of a system may protrude over a property line without acquisition of an easement for the encroachment from the adjacent property owner(s), nor over an easement without proper written release from the utility provider or entity who owns or controls such easement.
(4) A wind energy system may exist only as an accessory use, and it may not be constructed/installed until a primary structure exists on the property. A wind energy system may only supply power to structures on the lot/parcel where the system is located (i.e., not to an off-site structure).
(5) For property sizes less than or equal to five (5.0) acres in area, the tower height shall be a maximum of sixty-five (65.0) feet. For property sizes greater than five (5.0) acres in area, the tower height shall not exceed one hundred (100.0) feet unless otherwise approved in the SUP ordinance. Blade clearance shall be a minimum of twenty (20.0) feet above the ground.
(6) Wind energy conversion systems must comply with applicable Federal Aviation Administration (FAA) regulations, including any necessary approvals for installations close to airports, and must also comply with applicable ASHTO engineering standards.
(7) The tower for a wind energy system shall be set back a minimum distance of two (2.0) times the tower’s height from all property lines, public rights-of-way and occupied buildings, and shall be set back a minimum distance of one and one-half (1.5) times the tower’s height from the applicant’s own building(s) on the property unless constructing the WEC according to subsection
(16) below.
(8) The tower for a wind energy system shall be set back a minimum distance of one and one-half (1.5) times the tower’s height from any overhead utility lines, unless written permission is granted otherwise by the affected utility.
(9) No tower shall be erected closer than two hundred (200.0) feet or a distance of five (5.0) times the diameter of the larger rotor, whichever is the greater distance, to another wind energy tower.
(10) All wind energy systems shall be equipped with a redundant braking system. This includes both aerodynamic over speed controls (including variable pitch, tip and other similar systems) and mechanical brakes. Mechanical brakes shall be operated in a fail-safe mode. Stall regulation shall not be considered a sufficient braking system for over speed protection.
(11) Safety and security measures.
(A) A clearly visible warning sign that states “Caution, High Voltage” must be placed at the base of all pad-mounted transformers and substations.
(B) All ground-mounted electrical and control equipment shall be labeled and secured to prevent unauthorized access.
(C) The tower shall be designed and installed so as to not provide step bolts or a ladder readily accessible to the public for a minimum height of 12 feet from the ground.
(D) All access doors to wind energy systems and their appurtenances (e.g., cabinets, junction boxes, etc.) shall be locked or fenced, as appropriate, to prevent entry by non-authorized persons.
(12) All electrical wires associated with a wind energy system, other than wires necessary to connect the wind generator to the tower wiring, the tower wiring to the disconnect junction box, and the grounding wires shall be located underground.
(13) Wind energy systems shall be required to comply with the noise standards and requirements contained within this code.
(14) Visual appearance.
(A) A wind tower and generator shall not be artificially lighted unless such lighting is required by the Federal Aviation Administration.
(B) The wind tower and generator shall remain painted or finished the neutral white, light grey or silver color or finish that was originally applied by the manufacturer.
(C) All signs, other than the manufacturer’s or installer’s identification, appropriate warning signs, or owner identification on a wind generator, tower, building, or other structure associated with a wind energy system, shall be prohibited. Such signs as described above shall be no larger than four (4.0) square feet in size, and shall be located near the base of the tower.
(D) No flags, pennants, banners or similar materials may be displayed on or attached to any portion of a wind energy system, including its tower, unless a proper permit is obtained from the city for a temporary sign/display, in accordance with article
21.09 (Signs).
(15) Nuisance prevention.
(A) Wind energy systems shall be sited, to the greatest extent practical, to minimize the impact of shadow flicker or blade glint upon any inhabited structures (except for the owner’s) or public roadways. Systems found to be a nuisance or a traffic hazard shall be shut down until the flicker or glint problem is remedied.
(B) Wind energy systems shall comply with all applicable Federal Communications Commission (FCC) rules, and shall not cause static noise interference with other individuals’ television reception or with private or public telecommunications (e.g., public safety communications, 911 dispatch, etc.).
(16) No wind energy system shall be placed or constructed on the roof of any existing structure unless such structure is/was designed and constructed to structurally accommodate and support a roof-mounted wind energy system. Certification by a structural engineer shall be required for any roof-mounted system. No roof-mounted WEC shall exceed a maximum height of sixty-five (65.0) feet, as measured from the lowest ground level elevation point of the structure to which it is mounted, to the top of the tower (i.e., at the center of the hub).
(17) A building permit shall be required for the installation of a wind energy system.
(A) The owner shall submit an application to the building official. The application shall be accompanied by standard drawings of the wind turbine structure, a line drawing of the electrical components, and two copies of the site plan for the wind energy system, and any fee the city requires for an accessory use or building.
(B) No permit for a wind energy system shall be issued until evidence of written approval has been given to the city that the utility company has been informed of the customer’s intent to install an interconnected customer-owned generator, and the utility company has expressed written approval for the system. Off-grid systems shall be exempt from this requirement.
(C) Building permit applications for wind energy systems shall be accompanied by standard drawings of the wind turbine structure, including the tower, base and footings. An engineering analysis of the tower showing compliance with the city’s building code, and certified by a licensed professional engineer, shall also be submitted. This analysis is frequently supplied by the manufacturer.
(D) Building permit applications for wind energy systems shall be accompanied by a line drawing of the electrical components in sufficient detail to allow for a determination that the manner of installation conforms to the city’s electrical code. This information is frequently supplied by the manufacturer.
(E) A building permit issued for a wind energy system shall expire if the system is not installed, functioning and passed city inspection within six (6) months (i.e., 180 calendar days) following the date the permit is issued.
(18) Abandonment.
(A) A wind energy system that is out-of-service for a continuous 12-month (i.e., 365 calendar days) period will be deemed to be abandoned. The building official (or designee) may issue a notice of abandonment to the owner of a wind energy system that is deemed to have been abandoned. The owner shall have the right to respond to the notice of abandonment within 30 calendar days from the date that the notice was mailed to the owner. The building official (or designee) shall withdraw the notice of abandonment and notify the owner that the notice has been withdrawn if the owner provides sufficient information that demonstrates the wind energy system has not been abandoned, and that it is in compliance and operational in accordance with the city’s regulations for WECs.
(B) If the wind energy system is determined to be abandoned, the owner of the wind energy system shall remove the wind generator and tower structure (including all its appurtenances) from the property at the owner’s sole expense within three (3) months (i.e., 90 calendar days) after the notice of abandonment has been sent to the owner. If the owner fails to completely remove the wind generator, tower and any associated appurtenances, the building official (or designee) may pursue a legal action to have the wind generator and tower structure removed at the owner’s expense.
(19) Future subdivision of any property upon which a wind energy system is located shall only be allowed if the WEC is a legally conforming use/structure, and if all setback, height and other requirements for WECs (as such exist at the time of such future subdivision) remain in compliance.
(Ordinance 24-08, sec. 2, adopted 9/17/09)