What is the difference between ESOS and SECR?

ESOS is a mandatory energy audit scheme for large organisations every 4 years. SECR requires annual energy and carbon reporting in annual reports. They have different thresholds, scope, and compliance mechanisms.

Do organisations need to comply with both ESOS and SECR?

Many large organisations must comply with both regimes. ESOS applies to UK groups with 250+ employees OR £44M+ turnover + £38M+ balance sheet. SECR applies to quoted companies and large unquoted companies/LLPs.

Can ESOS data be used for SECR reporting?

Yes, ESOS energy audit data can support SECR annual reporting, but SECR requires additional carbon emissions calculations and annual disclosure that ESOS does not provide.

ESOS vs SECR — How the Two Regimes Compare and Overlap

ESOS and SECR are the UK's two primary energy reporting regimes. Understanding their different thresholds, scope, deadlines, and where they overlap for dual compliance organisations.

Regime ComparisonData OverlapDual Compliance

← Part of our ESOS, SECR and UK SRS guide

Quick Overview: ESOS vs SECR

ESOS (Energy Savings Opportunity Scheme)

Mandatory energy audit every 4 years

Purpose:

Identify energy savings through comprehensive audits

Output:

Energy audit report + action plan (private)

Phase 4 Deadline:

5 December 2027

SECR (Streamlined Energy and Carbon Reporting)

Annual energy and carbon reporting

Purpose:

Transparent annual energy and carbon disclosure

Output:

Directors' Report disclosure (public)

Annual Deadline:

6 months after year-end

Key Insight: Many large UK organisations are subject to both ESOS and SECR. While they have different objectives, the data collection can be coordinated for efficiency and the regimes complement each other for comprehensive energy management.

Detailed Side-by-Side Comparison

Primary Purpose

ESOS

Energy audit and efficiency identification

SECR

Energy and carbon reporting transparency

Overlap

Both aim to reduce energy consumption

Legal Framework

ESOS

SI 2014/1643 (ESOS Regulations)

SECR

SI 2018/1155 (SECR Regulations)

Overlap

Both use Companies Act 2006 enforcement

Qualification Thresholds

ESOS

250+ employees OR £44M+ turnover + £38M+ balance sheet

SECR

Quoted companies + large unquoted (£36M/£18M/250)

Overlap

Many large organisations qualify for both

Geographic Scope

ESOS

UK operations only

SECR

Global operations for UK companies

Overlap

UK operations subject to both

Frequency

ESOS

Every 4 years (2026, 2030, 2034...)

SECR

Annual reporting in Directors' Report

Overlap

Ongoing data collection needed for both

Enforcement Body

ESOS

Environment Agency (England) + devolved bodies

SECR

Companies House + FRC monitoring

Overlap

Both can result in criminal prosecution

Compliance Scenarios by Organisation Type

Large Listed Company

FTSE 100 manufacturer with 5,000+ UK employees

ESOS ✓

SECR ✓

High

Challenge

Dual compliance + audit coordination

Recommendation

Integrated energy management system

Large Private Company

Private equity-owned group, £200M turnover

ESOS ✓

SECR ✓

High

Challenge

Similar data requirements, different reporting

Recommendation

Shared data collection processes

Medium Listed Company

AIM-listed company, 150 employees, £30M turnover

ESOS ✗

SECR ✓

Medium

Challenge

SECR only but may approach ESOS thresholds

Recommendation

Monitor growth against ESOS triggers

Large Unquoted Company

Family business, 300 employees, £50M turnover

ESOS ✓

SECR ✓

High

Challenge

Less experience with public reporting

Recommendation

Professional support for both regimes

Small Listed Company

Specialist services, 80 employees, £15M turnover

ESOS ✗

SECR ✓

Low

Challenge

SECR compliance without energy audit

Recommendation

Basic energy monitoring system

Very Large Private

Tech group, 150 employees, £100M turnover

ESOS ✗

SECR ✗

Low

Challenge

Below both thresholds currently

Recommendation

Prepare for future compliance as business grows

Growth Planning: Organisations approaching either threshold should prepare compliance systems early. Many businesses cross thresholds unexpectedly through acquisitions, organic growth, or changes in accounting treatment.

Data Overlap and Synergies

Energy Consumption

High - same underlying data sources Synergy

ESOS Use

Comprehensive audit of 90%+ energy use

SECR Use

Annual kWh and cost reporting

Synergy

ESOS provides detailed baseline for SECR

Efficiency

High - same underlying data sources

Energy Sources

High - complementary detail levels Synergy

ESOS Use

Fuel-by-fuel consumption analysis

SECR Use

Breakdown by electricity, gas, transport fuels

Synergy

Detailed ESOS data enhances SECR granularity

Efficiency

High - complementary detail levels

Carbon Emissions

Medium - additional calculation step needed Synergy

ESOS Use

Not required (energy focus only)

SECR Use

Scope 1, 2 and 3 emissions reporting

Synergy

ESOS energy data provides foundation for emissions calculations

Efficiency

Medium - additional calculation step needed

Energy Efficiency

High - direct application of findings Synergy

ESOS Use

Detailed opportunities identification

SECR Use

Narrative on efficiency measures taken

Synergy

ESOS opportunities inform SECR narrative

Efficiency

High - direct application of findings

Organisational Boundaries

Medium - need global view for SECR Synergy

ESOS Use

UK group companies only

SECR Use

Global operations for consolidation

Synergy

UK operations data useful for both

Efficiency

Medium - need global view for SECR

Practical Integration Strategies for Dual Compliance

Data Collection Coordination

Single energy monitoring system: Capture granular data suitable for both regimes
Annual baseline maintenance: Keep ESOS audit data current for SECR annual reporting
Carbon calculation automation: Build emissions factors into energy tracking
Global scope management: Separate UK ESOS data from global SECR requirements

Governance and Process Alignment

Joint oversight committee: Single board-level governance for both regimes
Coordinated external advisors: Lead Assessors who understand SECR requirements
Timeline coordination: Plan ESOS audits to support annual SECR cycles
Skills development: Cross-training teams on both regulatory requirements

ESOS-SECR Integration Timeline

Year 1

ESOS Audit Year

Conduct comprehensive energy audit. Use findings to establish baseline for next 3 years of SECR reporting.

Years 2-4

SECR Annual Cycles

Annual SECR reporting using ESOS data as foundation. Implement efficiency measures identified in ESOS audit.

Year 5

Next ESOS Cycle

Use 4 years of SECR data to inform next ESOS audit. Demonstrate energy efficiency improvements achieved.

Key Differences in Practice

ESOS Deadlines

• 31 Dec 2026: Qualification assessment date
• Throughout 2027: Energy audit completion
• 5 Dec 2027: Compliance notification
• Phase 5: Next cycle begins (date TBC)

SECR Deadlines

• Annual: Energy and emissions data collection
• 6 months after year-end: Annual report filing
• Continuous: Directors' Report compliance
• No end date: Ongoing annual requirement

Related ESOS and SECR Pages

ESOS Pages

ESOS Thresholds

Who qualifies for Phase 4

Is ESOS Mandatory

Legal framework and penalties

ESOS, SECR and UK SRS

How the three UK regimes work together

SECR Pages

SECR Thresholds

£36M turnover, £18M balance sheet, 250 employees

SECR Deadline

Filing deadlines and penalties

SECR and UK SRS

Hub page for both regimes

Sources and References

ESOS Legal Sources

ESOS Regulations 2014 (SI 2014/1643)ESOS Phase 4 Amendment Regulations 2023 GOV.UK ESOS Guidance

SECR Legal Sources

SECR Regulations 2018 (SI 2018/1155)GOV.UK SECR Guidance Companies Act 2006, Section 463