Definitions. The definitions set forth below shall be applicable to this article:
AMBIENT NOISE LEVEL
Sometimes referred to as "background noise," is the existing or inherent sound level of an area at any given time as produced by existing sources, normally specified as a reference level for determining intrusive sound levels introduced by new sources.
BLADE CLEARANCE
Required minimum distance between the lowest point of a rotor blade and the ground surface below it.
COMMERCIAL WIND ENERGY FACILITY (CWEF)
An electric generation facility consisting of one or more wind turbines with a combined rated capacity exceeding 100 kW, the main purpose of which is to supply electricity for offsite use. This term shall include all other related accessory structures and buildings serving the primary intention of the producing and transmitting of electricity off site. The term does not include wind turbines constructed primarily for residential use on site as a permitted accessory use.
DECIBEL (dB)
A unit of sound level which is a division of a logarithmic scale used to express the ratio of the sound pressure of the source to the pressure of an arbitrarily chosen reference pressure; the ratio is expressed on the decibel scale by multiplying its base 10 logarithm by 20.
FACILITY OWNER
The entity or entities having equity interest in a commercial wind energy facility, including their respective successors and/or assigns.
FAIL-SAFE MODE
A device or feature which, in the event of failure, responds in a way that will cause no harm or at least a minimum of harm to other devices or danger.
KILOWATT (kW)
The kilowatt is equal to 1,000 watts. This unit is typically used to express the output power of engines and the power consumption of electric motors, tools, machines, and heaters.
LANDOWNER, NONPARTICIPATING
Any landowner except those on whose property all, or a portion, of a commercial wind energy facility is located pursuant to an agreement with the facility owner or operator.
LANDOWNER, PARTICIPATING
A landowner upon whose property all, or a portion, of a commercial wind energy facility is located or pursuant to an agreement with the facility owner or operator.
METEOROLOGICAL TOWER (often referred to as a "met tower")
A structure designed to support the gathering of wind energy resource data, including the tower, base plate, anchors, cables, anemometers and any and all related appurtenances used to monitor or transmit wind speed and wind flow characteristics over a period of time.
NACELLE
The structure that houses all of the generating components, gearbox, drive train, etc., of a wind turbine.
OCCUPIED BUILDING
A residence, school, hospital, church, public library or other building used for public gathering that is occupied or in use when the permit application is submitted.
OPERATOR
The entity responsible for the day-to-day operation and maintenance of a wind energy facility.
RESIDENTIAL WIND ENERGY FACILITY (RWEF) (often referred to as "small wind")
An electric generation facility consisting of one or more wind turbines, with a combined rated capacity equal to or less than 100 kW, the purpose of which is to supply electricity for on-site residential use. This term shall include all other related accessory structures and buildings accessory to a primary use located on the same site.
ROTOR
The blades and hub assembly of a wind turbine.
SHADOW FLICKER
The on-and-off flickering effect of a shadow caused when the sun passes behind the rotor of a wind turbine.
STALL
The increased angle at which the relative wind strikes the blades of a wind turbine, or the "angle of attack," and reduces the induced drag associated with lift. Stalling occurs passively by increasing automatically when the winds speed up, but it increases the cross section of the blade(s) face-on to the wind, and thus the ordinary drag. A fully stalled turbine blade, when stopped, has the flat side of the blade facing directly into the wind.
TURBINE HEIGHT
The vertical distance measured from average elevation of the existing grade at the proposed tower foundation perimeter to the highest point of the turbine, including the turbine rotor blade. In the case of rooftop installations, see § 425-53D(4)(g).
VERTICAL AXIS WIND TURBINE (VAWT)
A type of wind turbine in which the axis of rotation is perpendicular to the wind stream and the ground. VAWT systems can be mounted on buildings, telecommunications towers and poles for the purpose of producing energy.
WIND ENERGY FACILITY ACCESSORY FACILITIES
All structures and buildings associated with the conversion of wind to energy with the exception of the wind turbine. Accessory facilities include but are not limited to structures, buildings, substations, meteorological towers, electrical transmission lines and access roads.
WIND TURBINE
A wind energy conversion system that converts wind energy into electricity through the use of a wind turbine generator and includes the nacelle, rotor, tower and turbine pad, if any.
YAWING
The misalignment between the wind and turbine pointing directions. By minimizing the yaw angle, power output is maximized and nonsymmetrical wind loads are minimized.