Skip to main contentThe UK’s Energy Savings Opportunity Scheme (ESOS) is entering its fourth phase.
For large undertakings – those employing 250+ people or meeting the financial thresholds of an annual turnover exceeding £44 million and an annual balance sheet total exceeding £38 million – compliance is mandatory. But as businesses prepare, there’s a bigger opportunity to seize.
At Envantage, we’ve worked with clients through every phase of ESOS since the scheme began 10 years ago. One thing is clear: organisations that start ESOS earlier can gain significant benefits.
ESOS Timeline
5th March 2025 – Submit ESOS phase 3 Action Plan
5th December 2025– Submit progress update 1 on Action Plan
2026 – Get ready and start conducting Phase 4 audits.
5th December 2026 – Submit progress update 2 on Action Plan
31st December 2026 – Qualification Date
5th December 2027 – Deadline to complete phase 4 and submit notification
5th December 2028 – Submit ESOS Phase 4 Action Plan
5th December 2029 – Submit progress update 1 on Action Plan
5th December 2030 – Submit progress update 2 on Action Plan
Why starting early makes sense:
- Unlock more value: Early compliance gives you time to identify and implement the most impactful projects, turning compliance into commercial gain.
- Avoid the rush: Many businesses leave ESOS to the last minute, which creates a shortage of qualified Lead Assessors. The later you act, the harder it can be to secure one and the more expensive it often becomes
- Strategic alignment: By embedding ESOS recommendations into your wider energy and net zero strategy, you create lasting value rather than short-term fixes.
Looking ahead
Whether ESOS is new for your business, or you’ve been through it before, Phase 4 is a chance to do things differently. With our experienced in-house Lead Assessors and highly experience energy experts, Envantage makes compliance straightforward and more rewarding for your business.
If you’re ready to start planning for Phase 4 or want to explore how ESOS can support your wider sustainability goals, Envantages’ team of energy and low carbon experts is here to help. Contact us today to find out more.
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