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.
|Eligible Renewable/Other Technologies:||
|Applicable Utilities:||Investor-owned utilities and cooperatives|
|System Capacity Limit:||10 MW|
|Insurance Requirements:||Not addressed|
|External Disconnect Switch:||Required|
|Net Metering Required:||No|
|Name:||Mont. Code § 69-8-601 et seq.|
|Name:||Administrative Rules of Montana 38.5.84|
|Organization:||Montana Public Service Commission|
1701 Prospect Avenue
Helena MT 59620-2601
This information is sourced from DSIRE; the most comprehensive source of information on incentives and policies that support renewables and energy efficiency in the United States. Established in 1995, DSIRE is operated by the N.C. Clean Energy Technology Center at N.C. State University.
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