ESOS Phase 4 can be more than a compliance exercise. It’s an opportunity to turn energy data into measurable savings and carbon reductions.
What is ESOS Phase 4?
The Energy Saving Opportunity Scheme (ESOS) is a mandatory government initiative requiring large UK businesses to undertake regular energy audits to identify savings.
ESOS Phase 4, with a compliance deadline of 5 December 2027, the scheme ensures companies assess energy use across buildings, industrial processes and transport, identify opportunities to save energy, and then report on it.
Compliance is not optional, but it is an opportunity.
How we can support
Our team of qualified ESOS Lead Assessors will reveal hidden inefficiencies, short paybacks, and long-term cost reductions.
With Energise, you get a seamless, data-driven route to compliance that also supports your energy management and Net Zero strategy.
If you meet the criteria, you have to comply. With our support, we’ll make sure you can profit from it.
How ESOS Phase 4 benefits business
Cut Cost with Compliance
Engaging Energise to deliver your ESOS report means gaining tailored insight into your organisation’s energy consumption.
Our expert auditors identify actionable energy saving opportunities that goes beyond minimum compliance treating ESOS Phase 4 as an investment rather than an expense, you can unlock long-term energy and cost savings.
Reduce the Risk
Non-compliance with ESOS Phase 4 carries legal, financial and reputational risks.
Our experienced ESOS team ensures your submission meets every regulatory requirement. With our thorough approach, we help safeguard your business against enforcement action and financial penalties. We manage the complexity so you avoid the risk.
Increase your Positioning
ESOS Phase 4 demonstrates leadership in sustainability and operational excellence, and integrates with our energy management programmes.
Use your ESOS compliance to enhance tenders, meet investor expectations, and support Net Zero goals gaining a clear edge over less proactive competitors.
Ready to take control of your energy use and meet your ESOS Phase 4 obligations?
Book a call with one of our experts
What's included in our ESOS service
We make ESOS compliance straightforward and practical. You focus on your business while we handle the details.
Our service includes:
- Structured data collection and analysis – We provide a clear data collection template for all required energy data: electricity, gas, building fuels, fleet, and grey fleet mileage. Our team reviews your data, identifies gaps, and applies industry-standard methods to fill them, ensuring your submission is complete and accurate.
- Representative sampling and surveys – We define a representative sample of your buildings, vehicles, and processes for survey. Our consultants conduct on-site and desk-based surveys to identify energy-saving opportunities across your operations.
- Detailed energy use and compliance reporting – You receive a professional Energy Use Report, analysing your total energy consumption and highlighting significant energy users. We prepare a Compliance Report that meets all ESOS requirements, outlining methodology, sampling, and identified savings.
- Audit-ready evidence pack, sign off and submission – All supporting documents, calculations, and reports are compiled into a single evidence pack, ready for audit by regulators. We present findings to your responsible director, secure sign-off, and submit your compliance notification to the Environment Agency.
With over 250 ESOS assessments delivered, covering more than 500 buildings and 300 vehicles, we help you achieve compliance and unlock real savings.
Who needs to comply with ESOS Phase 4?
ESOS Phase 4 applies to any UK organisation that:
- Employs 250 or more people, OR
- Has an annual turnover >£44 million AND a balance sheet total >£38 million.
The biggest benefits go to organisations that:
- Want to turn compliance costs into lasting savings
- Manage large estates, fleets, or manufacturing operations
- Have complex estates of high energy use
- Are exploring decarbonisation opportunities
- Are preparing for Net Zero or aligning with ISO 50001
- Want compliance managed professionally, with minimal disruption
If you qualify for ESOS, you’re already spending the money so make sure you’re also getting the value by choosing Energise.
Case Study: Energy Savings and Transformation with Energise
Energise’s holistic approach enabled this UK theme park to achieve substantial energy and cost savings, meet compliance requirements, and embed a culture of continuous improvement. The collaboration demonstrates the value of combining technical expertise, strategic insight, and staff engagement to deliver lasting impact.
Ready to discuss ESOS Phase 4?
Speak with one of our expert ESOS team today to discuss your specific requirements with one of our experts.
Our ESOS customers
We support projects covering 7.5% of the UK’s carbon footprint and deliver strong external audit success rates. Our blend of technical expertise and commercial insight makes us your ideal partner in carbon reporting and energy strategy.
Discover the real value of implementing ESOS recommendations
Real outcomes and deliverables
ESOS Phase 4 FAQs
ESOS is the Energy Saving Opportunity Scheme – a UK regulation requiring large organisations to complete energy audits every four years to identify cost-saving opportunities
ESOS compliance means meeting eligibility criteria, appointing an ESOS Lead Assessor, carrying out energy audits, producing an ESOS report, and submitting proof to the Environment Agency by the set deadline.
ESOS Phase 4 is the current compliance period ending 5 December 2027. It continues the UK’s commitment to improving business energy efficiency through periodic auditing and reporting.
An ESOS report documents your total energy consumption, significant energy uses, audit results and recommendations for energy-saving opportunities. It must be signed off by a qualified ESOS lead assessor.
An ESOS lead assessor is a certified professional who oversees the audit process, verifies the methodology and signs off your ESOS compliance submission.
ESOS integrates with Energy Management and can be aligned with Climate Change Agreements to streamline reporting and accelerate energy-saving implementation.
Failure to meet ESOS Phase 4 requirements can result in fines, enforcement action and reputational damage. Timely engagement with our ESOS consultant team ensures you stay compliant and penalty-free.
Got a question about ESOS Phase 4?
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