CMA Reviews Energy Licence Modification Appeals 2026

The Competition and Markets Authority (CMA) is handling appeals related to modifications in UK energy licences, initially proposed by the Gas and Electricity Markets Authority (GEMA) under the RIIO-3 price control framework. These appeals impact major firms, including Cadent Gas Limited and Southern Gas Networks. The complete timeline of events lays out a structured process for review and decision-making.

Timeline of Appeals

GEMA proposed modifications based on its RIIO-3 decisions announced in December 2025. Subsequently, five licence holders requested permission to appeal on 3 March 2026, indicating significant industry pushback. These companies include Cadent Gas Limited and Northern Gas Networks Limited. On 31 March 2026, the CMA granted permission for all grounds, focusing particularly on aspects of Ongoing Efficiency.

Timeline Highlights:

• 3 March 2026: Five licence holders sought permission to appeal.
• 31 March 2026: Permission was granted, and a panel of three, chaired by Kirstin Baker, was appointed.
• 23 April 2026: GEMA responded to appeals. Citizens Advice was allowed to intervene based on efficiency grounds.
• May-June 2026: All main hearings took place and documents exchanged, with joint responses from key appellants like Southern Gas Networks.
• August 2026: Provisional determinations were released by the CMA.
• 30 September 2026: Statutory deadline for final determinations.

Understanding the Appeals Process

To comprehend this appeal process, it's crucial to understand the timeline and involvement of the various entities. The appeals were prompted by disagreement with GEMA’s decision from February 2026 to amend gas distribution licences. By March 2026, the appeals had advanced significantly with the intervention of Citizens Advice and appellants generating joint responses.

• Participants Involved: Key players include Cadent Gas Limited, Southern Gas Networks, Northern Gas Networks, and regulatory bodies like GEMA and the CMA.
• Key Documents: These include the notices of appeal filed by each licensee, GEMA's responses, appellants' replies, and the decision notifications.

The Role of Key Stakeholders

The CMA's role is pivotal, coordinating the entire process to ensure fair deliberation. Citizens Advice provides an additional layer of consumer perspective in the appeal's focus on Ongoing Efficiency. Notably, the CMA appointed a dedicated panel to oversee these appeals, showcasing the structured approach mandated by its rules.

Implications for Licence Holders

This case sets a precedent for how energy licence modifications are handled in the UK. Licensees must navigate a complex landscape, balancing regulatory requirements while addressing efficiency measures. These appeals reflect broader market tensions over regulatory changes impacting operational costs and consumer pricing.

Next Steps for Stakeholders

Companies involved must prepare for the statutory final determinations due by the end of September 2026. Engagement with regulatory processes remains crucial:

1. Monitor CMA updates for any changes to timelines or additional determinations.
2. Prepare compliance strategies in alignment with potential outcomes of these appeals.
3. Collaborate and share insights with stakeholders to address mutual challenges effectively.

Conclusion

The appeals process for energy licence modifications is a critical juncture for all stakeholders involved. The decisions issued by the CMA will set important precedents affecting regulatory approaches and corporate strategies within the UK's energy sector.