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ESOS - Energy Savings Oppurtunity Scheme

The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment scheme which applies to large businesses only (known as ‘large undertakings’).

ESOS requires participants to:
• Measure their total energy consumption
• Conduct energy audits
• Report compliance to the Environmental Agency on  4 yearly basis

Who qualifies as a large undertaking?

1. An organisation with 250 or more employees.
2. An organisation that has fewer than 250 employees, but has:

• an annual turnover exceeding €50m and
• a balance sheet exceeding €43m

If there is one large undertaking in the group then ESOS applies to all elements of the group.

Timeframes for compliance

UK organisations must assess whether or not they are required to participate in ESOS on the qualification date of each phase. The qualification date is 31 December 2014 for the 1st phase.

For those that do qualify, there is then a compliance date of 5th December 2015 for the first phase. This is the date by which an organisation must notify the Environmental Agency of their compliance.

Our role 

The scheme requires a `Lead Auditor’ to review and sign off the ESOS assessments along with a senior Director of the company.

Axion Energy Solutions have been accredited as ESOS Lead Asssessors.

We can help you to audit your business, register your compliance with the Environmental Agency, and save costs along the way.

In the meantime we would suggest that you take a look to see what data must be collected under ESOS and begin collating it now.

Feel free to contact us at  if we can help answer any questions.

What kind of savings can be found?

These can range from small to large, depending on what energy saving activities have been carried out already. They are likely to include:

Quick wins

• optimise controls settings
• address maintenance issues
• encourage behavioural changes
• analyse energy data to identify abnormal operating conditions

Medium term

• Uplamping - Replacing lighting lamps with most appropriate energy efficient lamps
• Fitting lighting controls to give additional savings to uplamping projects
• Installing additional controls to equipment to reduce usage
• VSD drives to fans, pumps, and process equipment
• Building fabric improvements
• Heating system upgrades / replacement

Longer term

• Design advice on replacing capital plant to ensure that replacement plant and equipment is selected to minimise energy consumption by matching it to the site operating conditions.