How Manufacturers Can Unlock More Value from ESOS Phase 4

For many organisations, the Energy Savings Opportunity Scheme (ESOS) is viewed primarily as a tick-box exercise: a requirement to complete an energy audit, submit the relevant documentation and satisfy regulatory expectations. However, for manufacturers especially, ESOS has the potential to deliver value beyond just compliance with a regulation.

Manufacturing businesses typically operate a wide range of energy-consuming assets within complex operational environments. As a result, the opportunities identified through ESOS audits can have a significant impact on operating costs, productivity, asset performance and long-term competitiveness. As ESOS continues to evolve, organisations are increasingly expected not only to identify opportunities for improvement, but also to demonstrate progress against them over time.

Why manufacturers are uniquely positioned to benefit from ESOS

Whether used to power production lines, process equipment, compressed air systems, refrigeration, heating or transport fleets, energy consumption is embedded within day-to-day operations.

In addition to opportunities related to building services such as lighting and HVAC systems, manufacturers can often unlock value across a much broader range of activities.

The scale and complexity of manufacturing operations means that relatively small efficiency improvements can generate substantial financial returns. Many energy-saving opportunities can also deliver wider operational benefits, including increased productivity, improved reliability and reduced maintenance requirements.

ESOS Phase 4: Moving beyond compliance

One of the key facets of ESOS is that it requires organisations to examine energy consumption across multiple areas of the business, including buildings, transport and industrial processes.

Manufacturers can use the assessment process to answer important operational questions:

• Which production lines consume the most energy?
• How does energy use vary between sites, shifts or products?
• Which assets are operating inefficiently?
• How much energy is being consumed during non-productive periods?
• Where are the most attractive opportunities for improvement?

The most valuable outcome is then not the regulatory submission itself, but the visibility the assessment process provides. By creating a clearer understanding of how energy is used across the organisation, manufacturers can make more informed decisions about operations and future investment.

Where manufacturers typically uncover the greatest opportunities

The biggest opportunities identified through ESOS are not always found through high-spend equipment replacement projects. In many cases, the greatest value comes from understanding how energy is used across operations and improving the performance of existing processes & assets.

Better visibility through energy monitoring

Before organisations can improve energy performance, they need confidence in where energy is being consumed and why.

Energy monitoring and targeting programmes are consistently among the most valuable recommendations identified through ESOS assessments. Enhanced monitoring through submetering and energy management tools can help manufacturers understand energy consumption at the site, process and asset levels, identify anomalies, and prioritise improvement activities.

While energy monitoring programmes do not typically deliver direct savings, they enable organisations to identify and prioritise future energy-saving opportunities.

Controls and operational optimisation

Many manufacturing facilities have unrealised opportunities to improve how their existing equipment is controlled and operated.

Examples frequently identified through ESOS assessments include:

• HVAC scheduling and optimisation
• Improved temperature controls
• Production shutdown procedures
• BMS optimisation
• Fan and pump control improvements
• Chiller optimisation programmes

These types of initiatives often require low or no investment while delivering meaningful reductions in energy consumption, allowing for an almost immediate return on investment.

Utility and support systems

Supporting systems often present some of the most cost-effective opportunities.

Common examples include:

• Compressed air leak detection and repair
• Ventilation and extraction system improvements
• Air handling unit upgrades
• Pump and motor efficiency improvements
• Process cooling and chiller optimisation
• Pipework insulation and heat-loss reduction

Because these systems operate continuously in the background, inefficiencies can often persist unnoticed for years.

Strategic capital investment

Although many energy savings can be achieved without major investment, ESOS can also identify opportunities for longer-term capital projects, particularly where ageing infrastructure is limiting operational performance.

Examples regularly identified through ESOS include:

• Solar PV installations
• Heat pumps
• Heat recovery systems
• Lighting upgrades
• Fleet electrification
• Major plant and equipment replacement

While these projects require larger capital investment, they can support both energy reduction and broader decarbonisation objectives in the long-term.

Focusing on energy intensity rather than energy consumption

One important distinction for manufacturers is that success should not always be measured by reducing total energy consumption. Growing businesses will naturally consume more energy as production volumes increase. This means that energy intensity, such as energy consumed per unit produced, is a more meaningful measure.

With energy intensity ratios being a key reporting requirement of the scheme, ESOS can help manufacturers understand whether they are becoming more efficient, even as output grows. This is particularly valuable when assessing production performance, benchmarking facilities and building the business case for future improvement projects.

Rather than simply asking how much energy is being used, manufacturers can begin asking whether that energy is delivering maximum value.

Supporting wider business objectives

The insights generated through an assessment can support a range of wider organisational priorities, including:

• Reducing operational costs
• Improving productivity and asset performance
• Supporting capital investment planning
• Strengthening energy resilience
• Improving energy data and governance
• Accelerating decarbonisation and net zero programmes

As regulatory expectations continue to evolve, organisations with robust energy data will be better positioned to prioritise investment, demonstrate progress and respond to future requirements.

ESOS Phase 4 as a strategic opportunity

For manufacturers, ESOS Phase 4 provides an opportunity to identify inefficiencies, improve operational performance and build a stronger foundation for future investment decisions.

By using the assessment process to better understand energy consumption across sites, assets and processes, organisations can unlock benefits that extend far beyond compliance. Those who take a proactive approach are likely to reduce costs, improve resilience and accelerate progress towards their sustainability objectives.

To find out how our ESOS Phase 4 specialists can support your organisation, get in touch today. We can help you achieve compliance while identifying opportunities to improve energy performance across your operations.