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Combined Heat and Power Partnership

Michigan Interconnection Standards

Date Last Updated8/13/2014
Policy TypeInterconnection Standard
State/FederalMI
Policy Administrator/Contact OfficeMichigan Public Service Commission (PSC)
Policy Initiation Date9/11/2003
Policy SummaryMichigan adopted revised rules for interconnection that apply to CHP. The rules apply to investor-owned utilities and electric cooperatives in the state. There are five interconnection categories:
  • Category 1: applies to certified, inverter-based systems of up to 20 kW. An application fee of $75 is charged for this level. No liability insurance is required for this level.
  • Category 2: applies to systems greater than 20 kW and up to 150 kW. No liability insurance is required for this level.
  • Category 3: applies to systems >150 kW up to 550 kW. General liability insurance of at least $1 million is required.
  • Category 4: applies to systems greater than 550 kW and up to 2 MW. General liability insurance of at least $1 million is required.
  • Category 5: applies to systems greater than 2 MW. General liability insurance of at least $1 million is required.
Certified systems are defined as those that use equipment certified by a nationally recognized testing laboratory to IEEE 1547.1 testing standards and in compliance with UL 1741. Additionally, customer-generators are not required in the rule to install an external disconnect switch, although the PSC declined to prohibit utilities from making such a requirement. The rules contain specific time lines for the processing and review of interconnection requests for different categories of system. Utilities must designate and maintain points of contact for initial information requests and must designate a point of contact for each interconnection applicant to address inquiries about technical issues and the status of interconnection requests (contact information for individual utilities is available on the program web site). Disputes may be resolved through the PSC and technical disputes may be put before a panel of independent experts. Utilities are responsible for reasonable expenses incurred by the expert panel in their investigation. Utilities must provide standard interconnection applications and agreements to customers, though Category 1 systems have a simplified application.
CHP Eligibility RequirementsBoth fossil-fueled and renewably-fueled CHP systems are eligible for standardized interconnection.
Eligible Project Size (MW)All sizes are eligible for standardized procedures.
Applicable Forms Applicable forms and procedures for Category 1 & 2 projects.
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