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IIRG DG Interconnection Tariff Proposal: Technical Session (DPU 25-48)

Wednesday, September 24, 2025
9 a.m. - 5 p.m.

Address

1 South Station, 3rd Floor, Boston, MA 02110
Directions 
Zoom Link 

Overview

The Department is conducting a hybrid technical session to discuss matters related to the Interconnection Implementation Review Group’s (IIRG) proposed revisions to the Model Standards for Interconnection of Distributed Generation Tariff (DG Interconnection Tariff) 

The session will take place on Wednesday, September 24, 2025, at 9:00 a.m. The public is welcome to observe the proceedings through a virtual livestream and interested stakeholders are welcome to participate in discussions. For audio-only access to the session, attendees can dial-in at 1 646-558-8656 and then enter Meeting ID# 841 1752 4746.  

If necessary, the Department has reserved a second day to continue discussions relating to this matter. The second session will take place on Thursday, September 25, 2025, at 9:00 a.m. For audio-only access to the session, attendees can dial-in at 1 646-558-8656 and then enter Meeting ID# 884 0715 6020. Please see the Events page for more information.

For any questions regarding the matter, please contact Katherine.e.stock@mass.gov, katie.zilgme@mass.gov, Kristen.lommele@mass.gov, and Annemarie.belle@mass.gov. 

Agenda

  • Introduction
    1. Background/History of the IIRG
    2. Update from the IIRG
  • Discussion Topic #1: Common System Modification Fee
    1. Companies' data on costs of secondary upgrades triggered by Small DG projects filed on September 12, 2025
      1. Unitil
      2. NSTAR Electric
      3. National Grid
    2. NSTAR Electric Fee/Design Structure in Connecticut Presentation
    3. IIRG Industry Group Presentation
    4. Common System Modification Fee Structure
    5. Process and Parameters for Fee Adjustment
    6. Considerations related to other modifications to the Simplified Application Fee
  • Discussion Topic #2: Shared Secondary Technical Screens
  • Discussion Topic #3: Technical Standards
  • Discussion Topic #4: Non-Consensus Definitions
  • Discussion Topic #5: Additional Considerations
  • Next Steps

Additional Resources

Open PDF file, 377.97 KB,  DPU 25-48 IIRG Hearing Officer Memo (English, PDF 377.97 KB)

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