Energy Savings Opportunity Scheme

ESOS Reporting.
Expert. Compliant. On time.

ESOS is a mandatory legal requirement for large UK businesses. EnergyFit's chartered engineering team manages your full compliance — from data collection and Lead Assessor sign-off through to Action Plans, progress reports, and Phase 4 preparation.

Phase 3 Progress Report 2 — Dec 2026 Phase 4 Notification — Dec 2027 CIBSE Lead Assessors Action Plans Included

Check your ESOS status How we help

What is ESOS?

Mandatory energy auditing for large UK organisations

The Energy Savings Opportunity Scheme is administered by the Environment Agency. If your business qualifies, compliance is a legal obligation — not a choice.

95%

Minimum energy consumption coverage required in your ESOS audit (Phase 3 onwards)

4 yrs

Scheme runs in four-year phases — Phase 4 qualification date is 31 Dec 2026

£90k

Maximum civil penalty for non-compliance with ESOS obligations

Who must comply?

ESOS applies to any UK large undertaking that on the Phase qualification date meets either criterion:

250 or more employees
Annual turnover exceeding £44m and balance sheet over £38m
Part of a corporate group meeting these thresholds in aggregate

What does an ESOS assessment cover?

Buildings — heating, cooling, lighting and equipment
Transport — fleet, business travel and logistics
Industrial processes — manufacturing, plant and data centres
Energy intensity ratios (mandatory from Phase 3)
Cost-effective energy saving opportunities register

New requirements in Phase 3 & 4

Mandatory written Action Plan signed by a company director
Two annual progress update reports required after Action Plan
Audit coverage raised from 90% to 95% of total energy consumption
Compliance data publicly disclosed by the Environment Agency

Enforcement & risk

Civil penalties up to £90,000 for non-compliance
Additional daily fines for continuing non-compliance
Public naming of non-compliant organisations
Reputational risk from mandatory public disclosure
Over 80% of organisations now Phase 3 compliant — don't be in the remainder

Compliance Timeline

Phase 3 & Phase 4 key dates

Every deadline tracked, every submission managed — we keep your business ahead of the Environment Agency's requirements.

6 Aug 2024

Phase 3 compliance notification Complete

Organisations notified the Environment Agency of Phase 3 compliance. If missed, enforcement risk is live — contact us immediately.

5 Mar 2025

Phase 3 Action Plan submission Complete

Written Action Plan outlining energy-saving commitments for the next four years — signed off by a company director.

5 Dec 2025

Phase 3 — Progress Report 1 Complete

First annual update on Action Plan implementation submitted to the Environment Agency.

5 Dec 2026

Phase 3 — Progress Report 2 Due soon

Second and final progress update — closes Phase 3 obligations. We prepare and submit this on your behalf.

31 Dec 2026

Phase 4 qualification date Phase 4

Businesses meeting ESOS eligibility criteria on this date fall into Phase 4 scope. Begin data preparation now for a smoother process.

5 Dec 2027

Phase 4 compliance notification Phase 4

Full ESOS assessment, Lead Assessor sign-off, and compliance notification submitted through the MESOS portal.

Our Service

End-to-end ESOS compliance, managed by our chartered engineers

We handle every stage — from eligibility check through to Environment Agency submission and ongoing progress reporting, so your team can stay focused on the business.

Eligibility assessment & scoping

We confirm your ESOS scope including corporate group structure, identify which sites and energy streams require auditing, and map your exact obligations and deadlines.

Energy data collection & analysis

We gather 12 months of consumption data across buildings, transport, and industrial processes — meeting the 95% coverage threshold and calculating energy intensity ratios.

ESOS audit & CIBSE Lead Assessor sign-off

Our accredited Lead Assessors conduct site surveys, identify significant energy saving opportunities, and formally sign off your compliance notification for Environment Agency submission.

Action Plan development

We produce a board-ready Action Plan quantifying savings in £ and tCO₂e, ready for director sign-off — linking compliance directly to your cost reduction and Net Zero strategy.

Progress reporting & Phase 4 preparation

We manage your annual progress reports on schedule and begin Phase 4 data collection ahead of the 31 December 2026 qualification date, so you're never caught short.

ESOS Reporting.Expert. Compliant. On time.