DER Growth Scenarios and Load Forecasts Working Group

Distributed Energy Resource Growth Scenarios and Distribution Load Forecasting 


On February 10, 2017, members of the Commission’s Distribution Resource Plan (DRP) team facilitated a workshop entitled DER Growth Scenarios and Distribution Load Forecasting, Distribution Resource Planning Track 3 Sub-track 1, the objective of which was to consider the process and methodologies for forecasting the adoption of distributed energy resources (DER) and distribution load in order to inform the DRP process.  The workshop also considered the coordination issues and how the DRP will inform the Commission’s Integrated Resource Planning (IRP) process, the California Energy Commission’s Integrated Energy Policy Report (IEPR) demand forecast, and California Independent System Operator’s Transmission Planning Process (TPP). As part of the workshop, the Investor-Owned Utilities (IOUs) submitted a proposed process for developing, vetting and updating of DER Adoption Scenarios and load forecasts.

This Working Group is part of the Distribution Resources Plan (DRP) proceeding’s (R.14-08-013) Track 3 (Policy) Sub-track 1 (DER Adoption and Distribution Load Forecasting) activities, and is being organized pursuant to the Assigned Commissioner’s Ruling (ACR) issued February 27 in this proceeding. The purpose of this Working Group is to provide an opportunity for interested stakeholders and IOUs to discuss approaches to load and DER forecasting for distribution planning.

The Working Group will review and discuss the content presented in the IOUs’ “Joint IOU Draft Assumption and Framework Document,” which was filed with the CPUC by the IOUs. The document focuses on three main topics:

  • System-wide DER growth assumptions
  • Load forecasting at the distribution level
  • Methodologies for disaggregation of system-level DER forecasts to circuits.

The Working Group discussions will help inform the Joint IOUs’ Revised Assumptions and Framework Document, which is due to be submitted on June 9.

IOUs may be contacted via their respective case managers:

  • PG&E:
  • SCE:
  • SDG&E:

CPUC Energy Division contact:

  • CPUC:

Questions regarding the Working Group should be addressed to

Participating in the Working Group:

This Working Group is open to all parties interested in participating. To join the mailing list, please fill out this form. 

Helpful Readings:

Upcoming Meetings:

This is a draft meeting schedule for this Working Group and is subject to change. Please join the mailing list to receive the most up-to-date information regarding this Working Group.

  • April 26: Focus on Demand Response
  • May 3: Focus on Distributed Generation, Energy Storage, and Electric Vehicles
    • Time: 10:00AM – 3:30PM (confirmed)
    • Location: Opera Plaza Conference Room (601 Van Ness Avenue, San Francisco, CA 94102)
    • Webinar registration
  • May 10: Focus on Energy Efficiency
    • Time: 10:00AM – 4:00PM (tentative)
    • Location: Alameda County Training and Education Center, Hayward Meeting Room (125 12th St., Suite 400, Oakland, CA 94607)
  • May 17: Recommended Revisions to Draft Document and Next Steps
  • May 24: Review Draft Document and Finalize Consensus/Non-Consensus Input
    • Time: 9:00AM – 12:00PM (tentative)
    • Location: Opera Plaza Conference Room (601 Van Ness Avenue, San Francisco, CA 94102)
    • Webinar registration

Past Meetings:

  • April 17: Introduction to WG, Review of IOUs’ Assumptions & Framework Document, Discussion
    • Time: 10:00AM – 4:00PM
    • East Bay Community Foundation (353 Frank H. Ogawa Plaza, Oakland, CA 94612)
    • Webinar recording 
    • participant list
    • meeting notes
    • Agenda:
      • Introductions: Overview of the ACR and purpose of the WG (slides)
        • Supplemental Background (slides)
      • Overview of system level forecasting (slides) and distribution planning (slides)
      • Overview of the IOUs’ Draft Assumptions & Framework Document (slides)
      • System-level Discussion: System-level forecasting assumptions (slides)
      • Distribution-level Discussion: load assumptions and disaggregation methodology (slides)