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MAC SWECS Model Ordinance
Small Wind Energy Conversion Systems
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Model Ordinance Addresses
Turbine Size
Lot Size
Height
Setbacks
Electricity Use
Noise
Color
Number Permitted
Setbacks
Climbing
Blade Clearances
Lighting
Shadow Flicker
Engineered Structure
Insurance
Signage
Utility Connection
Installation
Abandonment
Wind Access
Safety Controls
Process for Approval
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Turbine Examples
Horizontal Axis
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Turbine Examples
Vertical Axis
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Turbine Examples
Building Mounted
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MAC SWEC: Turbine Size
Maximum 15 kilowatts for residential use.
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Turbine Size
Maximum 100 kilowatts for commercial, industrial,
or institutional use.
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Turbine Size For comparison, this is a Utility Scale
turbine (Wind Farms).
Typically 200-400 feet in height.
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MAC SWEC
Minimum Lot Size - 1 acre.
Maximum Height - measured to Total System Height for freestanding turbines:– 65 feet for lots greater than 1 but less than 3
acres in size.
– 80 feet for lots 3-7 acres in size.
– 100 feet for lots greater than 7 acres in size.
Building mounted turbines limited to 10 feet above the attachment point to the building.
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MAC SWEC
Setbacks:
– Freestanding equal to 150% of total
system height.
– Building mounted equal to building
setback.
Electricity Use – on premises only.
Noise – must comply with existing
noise ordinances.
Color – white, sky blue, light gray.
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MAC SWEC
Number Permitted:– Residential:
1 freestanding per eligible lot.
No building mounted.
– Commercial, Industrial, Institutional: 1 freestanding exceeding typical height requirements of zone
per eligible lot.
Additional freestanding but no taller than the tallest existing
building on site.
Additional building mounted conforming to all requirements.
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MAC SWEC
Number Permitted:– Wind Farm:
Not anticipated by MAC SWEC.
Purpose to generate more energy than consumed on site.
More than 2 acres would likely be necessary.
Recommend only as a PUD in Des Moines city limits.
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MAC SWEC
Climbing – designed to prevent within first 10 feet of ground.– Only monopole type towers
are permitted.
Blade Clearance:– 30 feet from ground for
horizontal axis; 10 feet from ground for vertical axis.
– Not within 20 feet of trees, utilities, structures.
Lighting – none unless required by FAA.
Monopole TowerLattice Tower
Guyed Tower13
MAC SWEC
Shadow Flicker –
alternating intensity of
light caused by sunlight
through spinning blades
of a turbine.
– May not cause shadow
flicker on an existing
residential structure.
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MAC SWEC
Insurance – liability insurance in an
amount to be determined by each
jurisdiction.
Signage – none.
Utility Connection – require
Interconnection Agreement with utility
if grid connected.
Engineered Structure – require
certification by Iowa Licensed P.E. for
the turbine, tower, and foundation.
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MAC SWEC
Safety Controls:
– Automatic braking during high winds to
prevent system failure.
– Manual shut off clearly marked and
accessible as determined by designated
official (fire marshal, chief building official).
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MAC SWEC
Installation – per manufacturer’s specs and
must meet applicable building codes.
Abandonment – deemed abandoned after 6
months of non-operation and must be removed
by owner within 6 months of notice.
– Jurisdiction Right of Entrance to remove as a
condition of approval.
Wind Access – no guarantee of adequate wind
by local jurisdiction.
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MAC SWEC
Process for Approval – Special or
Conditional Use Permit by Board of
Adjustment.
– Ensures public notice and hearing.
– Conditional use if desire to allow only in
certain districts (like cell towers)
– Special Permit if desire to allow in all
districts.
– Appeals to District Court.
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NEXT STEPS
April 26, 2010: CC authorization to
proceed.
May 6, 2010: P&Z Hearing.
May 24, 2010 CC Set Date of Hearing.
June 14, 2010 CC Public Hearing.
June 28, 2010 CC 2nd Reading.
July 12, 2010 CC 3rd Reading.
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Questions?
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