CO HB1124

Creates an 18-member Colorado Electric Grid Resiliency Task Force to study vulnerabilities from severe space weather events and high-altitude electromagnetic pulses, with first meeting by November 28, 2026

Requires biennial engineering assessments of all covered transformers (100+ kilovolts, 25+ million volt-amperes) and development of a prioritized statewide hardening and spare-transformer plan with cost estimates

Mandates transmission-owning entities (investor-owned utilities, cooperatives, municipal utilities, federal power marketing administrations) participate in assessments and provide data, with costs recoverable through rates

Requires covered entity owners to file detailed transformer vulnerability reports with FERC as "Critical Energy/Electric Infrastructure Information" by December 31, 2027, and biennially thereafter

Directs the Public Utilities Commission to adopt rules by July 1, 2029, requiring implementation of highest-priority hardware-based mitigation measures; task force repeals September 1, 2031