For more than a decade, I've worked with organisations across the UK preparing for ESOS. During that time, one question has dominated almost every conversation: "What's the minimum we need to do to comply?"
It made sense when ESOS was viewed as a four-yearly reporting exercise. But with energy prices rising, supply markets remaining volatile and decarbonisation climbing the corporate agenda, that mindset is now costing businesses money.
ESOS Phase 4 isn't just another compliance cycle. It's an opportunity to uncover waste, reduce costs, improve resilience and accelerate net zero ambitions.
The reality is simple: organisations can't control global energy markets, but they can control how much energy they consume.
Stop Buying Compliance
One of the biggest mistakes I see is businesses focusing on minimising audit costs while overlooking the value an audit can deliver.
I've seen organisations spend weeks trying to reduce the number of audits required, saving a few thousand pounds on compliance while potentially missing hundreds of thousands of pounds in avoidable energy waste.
No CFO would reduce financial oversight to save money. Yet many organisations still view energy audits as a compliance cost rather than an investment in operational intelligence. That needs to change.
The Price Trap
Over the years, ESOS procurement has often become a race to the bottom on cost. Lower-cost audits inevitably mean less time spent understanding operations, analysing energy data and visiting sites. The outcome is often generic recommendations that deliver little value.
Businesses then conclude that ESOS itself lacks value, when in reality they've purchased the minimum level of analysis.
A well-executed ESOS audit should identify inefficiencies, support investment decisions and uncover savings that continue delivering returns long after compliance has been achieved.
Phase 4 Raises the Bar
Previous phases allowed some organisations to rely on minimal sampling and still satisfy requirements. Phase 4 places greater emphasis on robust evidence, representative sampling and demonstrating a genuine understanding of energy use across the organisation.
That's a positive development. The purpose of ESOS has never been to produce a report. The purpose has always been to reduce energy consumption.
Better Data, Better Decisions
Many organisations still rely heavily on monthly utility bills when preparing for ESOS. The problem is that bills tell you how much energy you used, not why you used it.
The real opportunities come from analysing half-hourly data, sub-metering and building management systems.
In one hotel group, sub-metered data revealed catering equipment being switched on hours before breakfast service every day. The result was almost £20,000 of unnecessary annual energy spend at a single site. That saving alone paid for the audit several times over.
Energy Efficiency Is Now Risk Management
Energy efficiency is no longer just a sustainability initiative. It is a resilience strategy.
Every kilowatt hour avoided reduces exposure to volatile energy prices, lowers operating costs and improves competitiveness.
As organisations electrify fleets, install EV charging and transition away from gas, managing demand will become just as important as sourcing renewable electricity. ESOS provides the roadmap.
The Biggest Failure Happens After the Audit
One of the most common reasons organisations fail to realise value from ESOS is simple: they don't act.
Reports are completed, compliance is achieved and recommendations sit on a shelf.
The organisations achieving the greatest returns are those that plan implementation before the audits are finished, align budgets, assign ownership and measure results. That's where ESOS delivers strategic value.
My Challenge to Business Leaders
If your organisation is approaching ESOS Phase 4 with the objective of spending as little as possible, I would encourage you to ask a different question.
Instead of: "What's the cheapest way to comply?"
Ask: "What's the value of truly understanding how our organisation consumes energy?"
One question focuses on cost. The other focuses on opportunity.
Organisations that embrace ESOS Phase 4 as a strategic business improvement programme won't just achieve compliance. They'll reduce costs, strengthen resilience, support decarbonisation and create competitive advantage.
In today's energy market, the cheapest ESOS strategy may well become the most expensive operational decision a business makes.
About the author
Scott Armstrong is a Senior Partner at edenseven and brings over 30 years of experience in the UK energy and sustainability sector, having held senior roles across consultancy and corporate leadership. His career began in energy supply, where he championed the use of interval data for efficiency initiatives, before moving into energy and carbon risk management. As Operations Director at Utilyx and later Head of Energy and Sustainability at Bourne Leisure, Scott led major decarbonisation programmes, cutting emissions by 42%, and built a reputation for delivering measurable impact.
At edenseven, Scott supports clients in accelerating their sustainability ambitions through strategies focused on energy efficiency, net zero transition, and sustainable technologies. He also leads on embedding nature-based solutions and regenerative thinking into business models. A former COO at Planet Mark and Chair of the Energy Managers Association, Scott brings a rare combination of strategic insight and operational delivery. Scott is also a judge for the Global Good Awards.
If you would like to know more about edenseven and how we are helping organisations manage energy and carbon cost, compliance and credibility please contact us at [email protected]