Ofgem issued RIIO-3 guidance establishing the price control framework for energy network companies during 2026-2031. The guidance covers electricity transmission (RIIO-ET3), gas transmission (RIIO-GT3), and gas distribution (RIIO-GD3) networks. The document package includes 15 supporting documents covering areas such as exit capacity planning, digitalisation strategy, biomethane governance, environmental reporting, re-opener mechanisms, and strategic innovation fund administration.

Network companies should review this master guidance alongside sector-specific documents to understand applicable licence conditions. Companies must ensure compliance with the referenced documents including price control deliverable reporting requirements, data best practices, and environmental KPI reporting. No specific compliance deadline or penalties are stated in this guidance publication.