Cost Transparency for Distributed Energy Resources Interconnection

On behalf of Berkeley Lab, Cody Davis with Electric Power Engineers presented on cost transparency for DER interconnection for the District of Columbia Public Service Commission's Interconnection Working Group on November 17, 2025. Topics included timelines and key concepts for design and cost estimation; drivers of variances between initial and final estimates and construction actuals, example practices from other jurisdictions, and key questions jurisdictions can ask.