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Renewable Energy

Banner of photos depicting alternative energy resources.


The County of Sonoma has adopted changes to the Zoning Code that enable the construction and use of renewable energy facilities throughout the county, while protecting sensitive resources and ensuring neighborhood compatibility. These changes became effective on 10-10-2013 and apply to parcels throughout the county, except in the coastal zone.


Renewable energy is considered a more sustainable energy supply because it is derived from sources that are naturally replenished including biomass, geothermal, solar and wind. The changes implement the resource conservation policies of the County’s General Plan to provide for widespread use of renewable energy through distributed generation and increase opportunities for renewable energy power producers. This effort was funded in part by an American Recovery and Reinvestment Act (ARRA) grant from the Department of Energy.


Renewable Energy projects are classified into two categories, Accessory Systems & Commercial Facilities:

  • Accessory Systems provide energy primarily for on-site use (up to 125% of the on-site demand), and are allowed as a permitted use (“by-right”) subject to certain criteria. Rooftop Systems are also allowed by-right throughout the County, and are not subject to the 125% of on-site energy demand threshold.

  • Commercial Facilities generate power primarily for off-site use, and are allowed with a Use Permit in certain zones. In the agricultural and resource zones, solar power generation facilities will require a rezone to add the “RE” (Renewable Energy) Combining Zone. All of these facilities are also subject to special use standards for the type of facility.

Renewable Energy Provisions and Special Use Standards

The adopted Renewable Energy provisions and the Special Use Standards for each type of renewable energy use are as follows:

Renewable Energy Ordinance

Adopted Ordinance and Definitions (PDF)

RE Combining Zone Regulations (PDF)

Allowable Uses and Permit Requirements for Renewable Energy Systems and Facilities

Allowed Uses and Permit Requirements (PDF)

General Development and Special Use Standards

BioEnergy (PDF)

General Development Standards for Renewable Energy Projects (PDF)

Solar Energy (PDF)

Wind Energy (PDF)

Incentives for Renewable Energy Systems

Density Bonus (PDF)

Required Parking Standards (PDF)

Summary Fact Sheets

Accessory Renewable System Systems (PDF)

BioEnergy Special Use Provisions (PDF)

Density Bonus (PDF)

Flexible Parking Standards (PDF)

General Development Standards for Renewable Energy Projects (PDF)

Renewable Energy (RE) Combining Zone (PDF)

Special Use Standards for Solar Systems and Facilities (PDF)

Special Use Standards for Wind Energy Systems and Facilities (PDF)


Board of Supervisor's Staff Report (PDF)

Related Links

Solar Permitting for Residential Rooftop Systems

Green Building Program

Electric Vehicle Charging Station Program and Installation Guidelines (PDF)


Some of these documents are saved in Portable Document Format (PDF). We recommend you download Adobe® Reader®, a free software that allows you view and print PDF files.

For accessibility assistance with these documents, please contact the Sonoma County Permit and Resource Management Department (PRMD) at (707) 565-1900.
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Although every effort is made to provide complete and accurate information on this website, users are advised to contact appropriate PRMD staff before making project decisions. This may involve contacting more than one section within PRMD (e.g. Building, Plan Check, Zoning, Well & Septic, etc.), since each section implements specific codes or ordinances which may affect your project.
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Permit and Resource Management Department County of Sonoma