2026 UK Energy Compliance Checklist

01Confirm ESOS Phase 3 qualification status

Check whether your organisation meets the ESOS threshold: 250+ employees OR turnover exceeding £44m. Include UK subsidiaries and group structures.

02Appoint a qualified Lead Energy Assessor

Your Lead Energy Assessor must be registered with an approved body (e.g. CIBSE, EI). Verify they are qualified to conduct onsite generation feasibility assessments — many are not.

03Gather 12 months of half-hourly interval data

Obtain half-hourly AMR data for all qualifying sites. This is the foundation of both the demand reduction assessment and the new onsite generation feasibility requirement.

04Complete onsite generation feasibility assessment

New for Phase 3: the audit must evaluate the viability of solar PV, battery storage, CCHP, and heat pumps. Include 10-year and 25-year cost-benefit projections.

05Assess 20% onsite generation requirement for new developments

For commercial/industrial developments over 1,000m², model whether solar PV, CCHP, or other technologies can meet 20% of predicted annual energy demand. Engage an energy consultant at RIBA Stage 2.

06Design in 30% battery storage capacity

For sites with installed generation capacity, include battery storage equal to at least 30% of that capacity. A 500kWp solar array requires 150kWh of BESS minimum. Aggregated storage across adjacent sites is permitted.

07Document net-zero pathway to 2040

All qualifying new developments must demonstrate a feasible operational net-zero pathway. This must be evidenced in building control submissions and reviewed at practical completion.

08Confirm SECR qualification and reporting boundary

Check whether your organisation meets SECR thresholds (large company criteria). Define your reporting boundary — include all UK sites, transport fuel, and any leased assets where you pay energy costs.

09Collect and validate energy consumption data

Gather electricity, gas, and transport fuel data for the reporting year. Reconcile against invoices and AMR data. Common errors: missing leased sites, double-counting exported solar, and outdated grid emission factors.

10Calculate Scope 1, 2, and intensity metrics

Apply the current DESNZ grid emission factor (approximately 180g CO2/kWh for 2026). Calculate Scope 1 (gas, fuel) and Scope 2 (electricity) in tCO2e. Include at least one intensity ratio (e.g. tCO2e per £m turnover).

11Prepare SECR narrative for Directors' Report

Draft the energy efficiency measures narrative. Describe actions taken during the reporting year to improve energy performance. Onsite generation projects, EMS upgrades, and demand-side measures all qualify.

12Request a Skyline DC Energy compliance audit

Skyline DC Energy provides ESOS Phase 3 audits that include onsite generation feasibility assessments, SECR data preparation, and Part L compliance modelling. Contact us to confirm availability before the Dec 2026 deadline.