Blog · Published 2026-05-12

How to apply for the Industrial Energy Transformation Fund (IETF) in 2026

The Industrial Energy Transformation Fund is the UK's largest single grant programme for industrial decarbonisation — and the toughest. Phase 3 closed in 2024 having awarded around £280m across 250 projects. Phase 4 is expected to open in Q2 2026 with around £100m available. This guide walks through what an IETF-ready manufacturer should be doing now to maximise their chance of award.

Should you even apply?

IETF is competitive. In Phase 3, around one in three Expressions of Interest progressed to full application; about half of full applications were funded. Strong projects with high carbon intensity and clear energy savings win.

Do apply if: - You operate an energy-intensive manufacturing site in England, Wales or Northern Ireland (Scotland has a separate scheme) - Your annual energy spend is above £200k and your annual energy consumption is above 1 GWh - You have a credible decarbonisation project with measurable energy or carbon savings - You can fund 50-70% match funding from non-government sources - You can absorb £40k-£80k of professional services costs to prepare the application

Don't apply if: - Your project is below £400k total capex — the application cost-to-benefit doesn't work - You're a pure office, retail or service operation - You can't articulate clear baseline energy use and projected savings - You've already received a similar UK or devolved grant in the last 3 years (subsidy ceiling)

Pre-application prep (start 6-9 months before the window)

Engage an energy auditor. IETF needs a robust ISO 50001-compatible energy baseline. External energy consultants typically £15k-£40k. Don't skip this — applications with poor baseline data are rejected.

Develop the project plan. RIBA Stage 2-3 design quality. Detailed engineering specification, supplier quotes, programme, cost plan.

Secure match funding evidence. This is where many applications fall over. You need documentary evidence of available match funding — bank facility offer letter, parent company guarantee, asset finance pre-approval, internal capital budget allocation.

Build the carbon & energy savings case. Use the IEA-recommended approach: measured baseline, modelled future state, monitored verification plan. Conservative assumptions win over optimistic ones.

Subsidy control review. Audit your cumulative UK or devolved government subsidies received in the last 3 years. If you're near a ceiling, structure the project to fit within remaining headroom.

Submitting the Expression of Interest

The EoI is a 2-3 page submission opening the window. It typically requires: - Project description (200-400 words) - Sector and SIC code - Projected energy / carbon savings (with brief methodology) - Indicative project cost and grant request - Match funding statement - Timeline to delivery

EoIs are typically open for 6-12 weeks. DESNZ screens within 8 weeks of the window closing. Successful EoIs are invited to submit a full application — typically with a 12-week submission window.

The full application

The full application is detailed — typically 50-80 pages of submission plus financial models. Major sections:

1. Strategic case. Why this project, why now, who benefits. 2. Economic case. Cost-benefit analysis to HM Treasury Five Case Model. 3. Financial case. Match funding evidence, project cash flow, post-grant company viability. 4. Commercial case. Procurement strategy, contracting approach. 5. Management case. Project governance, delivery team, risk management. 6. Technical case. Detailed engineering design, energy modelling, carbon savings methodology.

Submission via DESNZ's online portal. Independent technical assessment can take 3-9 months.

After the award

Successful applicants sign a Grant Funding Agreement with detailed milestones. Grants are paid in arrears against verified expenditure and energy savings.

Typical post-award timeline: - Award letter and GFA signature: 4-8 weeks after decision - First milestone (typically procurement and contractor mobilisation): 3-6 months after GFA - Construction and commissioning: 12-18 months from award - First grant claim payment: 6-9 months after first cost incurred - Energy savings monitoring: 5 years minimum post-commissioning

Many awards have failed at the delivery milestone stage — typically due to procurement delays, contractor underperformance or scope changes that weren't approved by DESNZ. Strong governance and active project management are critical.

FAQs

FAQs on this topic

What sectors qualify for IETF?

Energy-intensive manufacturing covered by Climate Change Levy main rates — food, drink, chemicals, paper, metals, glass, ceramics, cement, automotive assembly, and similar. Service sectors typically don't qualify.

Can IETF fund solar PV only?

Standalone solar PV applications are unlikely to win. IETF favours integrated decarbonisation packages — solar combined with heat recovery, process electrification, compressed air efficiency, or insulation.

How long does IETF approval take?

Typical end-to-end: 6-9 months from EoI to grant award. Faster for smaller projects; longer for complex multi-site applications.