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Are you ready to meet the ESOS Phase 3 deadline?

12 May 2023

The ESOS Phase 3 deadline has been extended to 5th June 2024. While June 2024 may seem a long way off ESOS is not a quick process, particularly with the announcement around new data requirements (which we'll cover below). Availability to book a qualified ESOS lead assessor is also becoming increasingly scarce. If you know or think ESOS applies to you then it's time to act.

Check if your organisation is eligible

Chances are that if you're reading this you probably know whether ESOS is for you or not. Most organisations who need to comply with the regulations will have done either or both Phase 1 and 2 already. But some companies will have grown over the past few years that will now fall under the ESOS eligibility.

Your organisation qualifies for ESOS if it is classed as a 'large undertaking'. This is if your business fulfils any, not all, of the following criteria:

  • Employs 250 or more people
  • Has an annual turnover of over £44m and an annual balance sheet total of over £38m
  • Is an overseas company with a UK-registered establishment which has 250 or more UK employees (paying income tax in the UK)

What happens if I fail to meet the deadline?

Companies that fail to fulfil their ESOS obligations risk being fined. These fines can go up to £50,000 with an extra £500 per day added for every day the company fails to deliver ESOS, up to a maximum of 80 days.

This equates to a potential penalty of £90,000, with ESOS still needing to be completed once the fine has been issued. More than 20 UK businesses were penalised for missing the Phase 2 deadline in 2019. 

Ensure you can meet all the new data requirements

Complying with ESOS Phase 3 has now become more difficult as the Environment Agency has increased the amount of data you need to submit. There are 13 extra additional requirements now which include a mixture of further company-related data such as SIC codes, trust info and organisations charts, alongside more complex undertakings such as transport data and a more granular breakdown of the impact of previous efficiency measures.

Read all the new ESOS Phase 3 data requirements.

ESOS helps you do more than just avoid a fine

While avoiding financial losses is a core motivator for ESOS, it isn't just a box-ticking exercise. The energy savings it brings can help improve the bottom line of your business by helping you use less energy which leads to cheaper energy bills.

We’ve already helped hundreds of organisations spot substantial savings on their energy costs and consumption. This includes a 46% reduction for a leading charity Sue Ryder and 41% for a national clothing retailer - read about these ESOS success stories.

Your next steps

ESOS must be conducted by a fully qualified ESOS lead assessor; it isn't a procedure you can follow without the necessary expertise. For this reason, you must speak to a third party who can organise ESOS for you. You can book a call with one of our ESOS experts and get your quote today.


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