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Incentives/Policies for Renewables & Efficiency

Printable Version
Interconnection Standards   

Last DSIRE Review: 09/08/2014
Program Overview:
State: Montana
Incentive Type: Interconnection
Eligible Renewable/Other Technologies: Photovoltaics, Wind, Hydroelectric
Applicable Sectors: Commercial, Industrial, Residential, Schools, Local Government, State Government
Applicable Utilities:Investor-owned utilities and cooperatives
System Capacity Limit:10 MW
Standard Agreement:No
Insurance Requirements:Not addressed
External Disconnect Switch:Required
Net Metering Required:No
Web Site:
Authority 1:
Date Effective:
Administrative Rules of Montana 38.5.84
Authority 2:
Date Enacted:
Mont. Code ยง 69-8-601 et seq.

In July 2010, the Montana Public Service Commission (PSC) adopted interconnection rules, effective August 13, 2010.  These rules apply to all electric utilities under the PSC's jurisdiction, including investor-owned utilities and co-ops.  Small generators, or systems up to 10 megawatts (MW) located on the land of utility customers within good standing are allowed to interconnect.  While there is no statewide standard interconnection agreement, the largest investor-owned utility in Montana, NorthWestern, does have a standard interconnection agreement for net-metered systems.  The use of certain equipment may qualify a facility for an expedited interconnection review.


Until August 2010, Montana had interconnection guidelines dictated by the net metering legislation, enacted in 1999.  These guidelines required interconnected facilities to comply with all national safety, equipment and power-quality standards established by the National Electrical Code (NEC), the Institute of Electrical and Electronic Engineers (IEEE), the National Electrical Safety Code (NESC) and Underwriters Laboratories (UL). Net metering applies to systems up to 50 kilowatts (kW) in capacity that generate electricity using hydropower, wind or solar energy. The law does not set a limit on the aggregate capacity of systems interconnected to each utility's distribution system.

  Will Rosquist
Montana Public Service Commission
1701 Prospect Avenue
Vista Building
Helena, MT 59620-2601
Phone: (406) 444-6359
Phone 2: (406) 444-6199
Fax: (406) 444-7618
Web Site:
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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.