Interconnection Standards (Montana)

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Last modified on February 12, 2015.

Rules Regulations Policies Program

Place Montana

Name Interconnection Standards
Incentive Type Interconnection
Applicable Sector Commercial, Industrial, Local Government, Residential, Schools, State Government
Eligible Technologies Hydroelectric, Photovoltaics, Wind
Active Incentive Yes

Implementing Sector State/Territory
Energy Category Renewable Energy Incentive Programs

Applicable Utilities Investor-owned utilities

External Disconnect Switch Required

Insurance Requirements Not addressed

Net Metering Required No

Standard Agreement No

System Capacity Limit 10 MW

Date added to DSIRE 2003-07-01
Last DSIRE Review 2012-09-13
Last Substantive Modification
to Summary by DSIRE

References DSIRE[1]


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.

Incentive Contact

Contact Name Will Rosquist
Department Montana Public Service Commission

Address 1701 Prospect Avenue
Address 2 Vista Building
Place Helena, Montana
Zip/Postal Code 59620-2601
Phone (406) 444-6359
Phone 2 (406) 444-6199
Fax (406) 444-7618

Authorities (Please contact the if there are any file problems.)

Authority 1: Administrative Rules of Montana 38.5.84
Date Effective 2010-08-13

Authority 2: Mont. Code § 69-8-601 et seq.
Date Effective 1999

  • Incentive and policy data are reviewed and approved by the N.C. Solar Center's DSIRE project staff.[1]


  1. 1.0 1.1  "Database of State Incentives for Renewables and Efficiency (DSIRE)"