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The U.S. Department of Energy and the North Carolina Clean Energy Technology Center are excited to announce that a new, modernized DSIRE is under construction. The new version of DSIRE will offer significant improvements over the current version, including expanded data accessibility and an array of new tools for site users. The new DSIRE site will be available in December 2014. Staff are currently working hard on the new version of DSIRE but are also maintaining the content of the current version of DSIRE. Thank you for your continued support and patience during this transition. We hope you are as excited for December as we are!

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Incentives/Policies for Renewables & Efficiency

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Property Tax Exemption for Renewable Energy Systems   

Last DSIRE Review: 08/18/2014
Program Overview:
State: Iowa
Incentive Type: Property Tax Incentive
Eligible Renewable/Other Technologies: Passive Solar Space Heat, Solar Water Heat, Solar Space Heat, Solar Thermal Electric, Photovoltaics, Wind, Geothermal Heat Pumps
Applicable Sectors: Commercial, Industrial, Residential, Agricultural
Amount:Solar and wind: 100% exemption for 5 years
Geothermal: 100% exemption for 10 years
Maximum Incentive:Not specified
Start Date:01/01/1978
Authority 1:
Date Effective:
Iowa Code § 441.21(8)
Authority 2:
Date Enacted:
Date Effective:
S.F. 2342
Authority 3:
Iowa Code § 427.1

In Iowa, the market value added to a property by a solar or wind energy system is exempt from the state's property tax for 5 full assessment years. Residential geothermal systems are exempt for 10 years. Eligible systems include:

  • a system of equipment capable of collecting and converting incident solar radiation or wind energy into thermal, mechanical, or electrical energy and transforming these forms of energy by a separate apparatus to storage or to a point of use which is constructed or installed after January 1, 1978;
  • a system that uses the basic design of the building to maximize solar heat gain during the cold season and to minimize solar heat gain in the hot season and that uses natural means to collect, store, and distribute solar energy which is constructed or installed after January 1, 1981; and
  • a residential geothermal system, new or retrofitted, installed on or after July 1, 2012, including all equipment included in the installation or labor required for the construction, as well as the proportionate value of any well field associated with the system or attributed to the owner.

The Iowa Department of Revenue (DOR) has issued an opinion determining that the solar and wind exemption can be applied to systems whose "primary purpose" is to store or provide electricity for use at the site where the system is located. This clarifies that solar and wind systems which periodically export electricity to the grid (e.g., net metered systems) are eligible to claim the exemption as long as they are used primarily to serve on-site electricity demand.

For the geothermal tax exemption, the person claiming an exemption must submit the appropriate forms to the assessor and must file the forms no later than February 1st of the first assessment year that the exemption is requested. The exemption may be taken for tax years beginning on or after January 1, 2013.

  Energy Team
Iowa Economic Development Authority
200 East Grand Avenue
Des Moines, IA 50309
Phone 2: (515) 725-0434
Web Site:
  Public Information - Revenue
Iowa Department of Revenue
Hoover State Office Building
1305 E. Walnut
Des Moines, IA 50319
Phone: (800) 367-3388
Phone 2: (515) 281-3114
Fax: (515) 242-6487
Web Site:
NCSU - home
Disclaimer: The information presented on the DSIRE web site provides an unofficial overview of financial incentives and other policies. It does not constitute professional tax advice or other professional financial guidance, and it should not be used as the only source of information when making purchasing decisions, investment decisions or tax decisions, or when executing other binding agreements. Please refer to the individual contact provided below each summary to verify that a specific financial incentive or other policy applies to your project.

While the DSIRE staff strives to provide the best information possible, the DSIRE staff, the N.C. Solar Center, N.C. State University and the Interstate Renewable Energy Council, Inc. make no representations or warranties, either express or implied, concerning the accuracy, completeness, reliability or suitability of the information. The DSIRE staff, the N.C. Solar Center, N.C. State University and the Interstate Renewable Energy Council, Inc. disclaim all liability of any kind arising out of your use or misuse of the information contained or referenced on DSIRE Web pages.

Copyright 2014 - 2015 North Carolina State University, under NREL Subcontract No. XEU-0-99515-01. Permission granted only for personal or educational use, or for use by or on behalf of the U.S. government. North Carolina State University prohibits the unauthorized display, reproduction, sale, and/or distribution of all or portions of the content of the Database of State Incentives for Renewables and Efficiency (DSIRE) without prior, written consent.