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Public utilities

Vermont Public Utility Commission Issues Order on Solar Net-Metering System

Strategic Insights

— 2 min read

The Vermont Public Utility Commission has resolved the interconnection issue and found a Certificate of Public Good ("CPG") deemed issued for a 500 kW roof-top solar net-metering system in Rutland, Vermont. The solar net-metering system is to be installed at 200 Farrell Road by Farrell Distributing Inc. The interconnecting utility, Green Mountain Power Corporation, had raised concerns about the proposed interconnection, citing system stability and reliability issues. The Applicant agreed to address these concerns by meeting certain conditions, including the installation of a three-phase generation meter, a GMP remote terminal unit, and limiting overvoltage contribution.

Key Takeaways:

  • The Vermont Public Utility Commission issued an order on November 30, 2023, resolving the interconnection issue for a 500 kW solar net-metering system in Rutland, Vermont.
  • The system is to be installed at 200 Farrell Road by Farrell Distributing Inc.
  • The interconnecting utility, Green Mountain Power Corporation, raised concerns about system stability and reliability due to the proposed interconnection.
  • The Applicant agreed to address these concerns by meeting the following conditions:

+ Construction of a three-phase 277/480V service approximately 300 feet in length.

+ Installation of a GMP remote terminal unit or PCC recloser.

+ Limiting overvoltage contribution according to IEEE Std. 1547 section 7.4.

+ Providing a letter from the inverter manufacturer or a National Recognized Testing Laboratory confirming compliance with the standard.

+ Using inverters compliant with the Inverter Source Requirement Document of ISO New England (ISO-NE SRD).

+ Executing a Project Notice to Proceed with the appropriate GMP distribution designer.

  • The Applicant agreed to construct and operate the Project in accordance with the requirements described in GMP's October 6, 2023, filing.
  • The Commission determined that the interconnection issue identified by GMP has been resolved.
  • A CPG is deemed issued for the Project, and the Applicant must commission the Project within one year of the date of this Order.

Statistics:

  • The proposed solar net-metering system has a capacity of 500 kW.
  • The system is to be installed at 200 Farrell Road in Rutland, Vermont.
  • The interconnecting utility, Green Mountain Power Corporation, required the Applicant to meet six specific conditions to address system stability and reliability concerns.
  • The Applicant agreed to limit overvoltage contribution according to IEEE Std. 1547 section 7.4.
  • The Applicant must execute a Project Notice to Proceed with the appropriate GMP distribution designer.
  • The Commission requires the Applicant to commission the Project within one year of the date of this Order.

Sources:

  • Vermont Public Utility Commission. (2023, November 30). Case No. 23-2026-NMR Application of Farrell Distributing Inc. for a certificate of public good for a 500.0 kW solar net-metered electric power system in Rutland, Vermont.

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