You can also call us on +44 (0)20 7170 7000, or select 'Live Chat' to chat with one of our advisors.

We will use any personal information you provide in this form to deal with the request or application you make. However, we may also use it to contact you in the future. For more details please refer to our Privacy Notice.

Energy Efficiency Loan Fund

Interest-free loans for energy efficiency and renewable energy projects in Wales

0% APR Loans for energy efficiency

Invest in your business and reduce overheads 

The Carbon Trust can help small and medium-sized enterprises (SMEs) in Wales to fund new energy efficiency and renewable energy projects with interest-free loans of between £3,000 and £200,000. And thanks to recent scheme changes eligible businesses can now access more interest free funding for every tonne of CO2 their project can save. 

Loans are subject to eligibility criteria. Other terms and conditions also apply. 

See our guide Steps to Success (PDF)’ for full details on eligibility criteria, qualifying technologies, and how to apply.

We have helped nearly 700 business in Wales save over £9m per year in fuel costs

Loans are available for a wide range of energy saving projects, including heating, cooling, lighting and solar PV, amongst many others. There are no set-up or administration fees. It only takes 15 minutes to apply and if successful, we can process your application within 10 working days.

Interested? Our online application form is quick and easy to complete, and the Loans Team are available to provide assistance Monday to Friday on 028 9073 4398.

Get in touch

If you need assistance with the application process, call the Loans Team on 028 9073 4398, or email If you would like us to contact you, please complete your details below and we’ll be in touch.

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We will use any personal information you provide in this form to deal with the request or application you make. However, we may also use it to contact you in the future. For more details please refer to our Privacy Notice. 

Project eligibility

Building Technologies

Industrial Process Technologies


Air conditioning
Building insulation
Heating controls
Heat recovery
Pipe insulation
Solar thermal systems

Compressed air
Material handling
Process heating
Process controls
Variable speed drives

Heat pumps
Solar PV
Solar thermals
Wind turbines
Hydro electricity


This list is not exhaustive and we can support most projects where there is a carbon emissions saving.

Check your eligibility

How much can your business borrow? To see how much you could potentially borrow, try our loan calculator (.xsls) 

Questions? see our FAQs  

Click here to apply online

Complete your application form today, but wait until you receive your loan agreements before placing an order or purchasing equipment. 

In a time when banks seem unwilling to lend to SMEs, the Carbon Trust proved an enthusiastic and knowledgeable partner to help us achieve our environmental targets.

Richard Haigh, Capital Valley Plastics

The team at the Carbon Trust was very efficient and friendly to work with, and were understanding of the challenges of our project timetable. The loan has enabled the Trust to avoid grant funding and therefore qualify for the Renewable Heat Incentive, which will be a significant help towards the running costs of the new biomass system.

Ran Foster-Mason, Aberglasney Restoration Trust

If you haven’t yet selected an equipment supplier for your project, try our Green Business Directory for a list of accredited suppliers working in your area. Please note that it is your responsibility to select and be satisfied with a supplier’s expertise, standing, reliability and competence. We also suggest that you seek a variety of quotes from different suppliers from which to select the most appropriate offer.


Click here to apply online



Case Studies

P&A wanted to install a new central heating system to improve conditions for employees based in offices and warehouses across the site. The new heating system was financed thanks to an interest-free loan from the Carbon Trust, which is projected to save the business over £20,000 a year.

A 0% business loan enabled Highfield Hall Hotel, a Grade II listed building in Northrop, North Wales, to upgrade to a new biomass boiler. Before, they struggled to heat the hotel, and could not justify opening all year round. The annual savings amount to £12,000 and 100 tonnes CO2.

Cohesive upgraded their heating and lighting with the help of a Carbon Trust 0% APR Business Loan, to reduce their energy costs, cut carbon emissions and ultimately, keep their office warm and safe. Annual savings amounts to £2,000 and 8 tonnes CO2.


Who can apply for an interest free loan?

You must be a privately funded business in Wales, operating in a sector permissible under de
minimis state aid regulations that has been trading for at least 12 months as an incorporated
company and filed its first year’s trading accounts with Companies House, or traded for a minimum
of 36 months as an unincorporated business.

Can the loan be used with other finance?

The loan amount is based on the project's energy savings, rather than cost, so additional finance may sometimes be required. 

If you have secured grant funding, the maximum loan amount we could provide is the net project cost less the grant funding. 

You can use company funds, or other unsecured lending. 

We do not permit other finance to be secured on the equipment, if you are considering additional finance please contact us to discuss. 

Application process - How long does it take?

Applications are submitted online, and if all the supporting documentation provided is correct, we can issue a loan offer within ten working days - often quicker - subject to availability of funds. 

Where do the funds come from?

Welsh loans are funded from the Carbon Trust reserves. 

Loan repayment

The repayment term is based on the amount borrowed divided by the anticipated annual monetary savings. This is then rounded up to the next full year, to a maximum 4 year repayment term. Monthly repayments commence after commissioning. 

Which suppliers can I use?

We do not make supplier recommendations for your project. You are free to choose your own supplier. However, you must ensure you choose a supplier who can implement the project to your satisfaction. If you are having difficulty identifying a suitable supplier, you may wish to consider using one of the Carbon Trust's Accredited Suppliers who are listed on our Green Business Directory

Can my supplier complete my application form?

No. Our agreement is with you, and it is crucial that you complete the online application form, and are aware of the terms and conditions associated with it. 

What's the catch?

There isn't one. The loans are unsecured, interest free, with no arrangement fees. 

The Carbon Trust is authorised and regulated by the Financial Conduct Authority for consumer credit.  The Carbon Trust is a company limited by guarantee, registered in England and Wales (number 04190230) with its registered at 4th Floor, Dorset House, 27-45 Stamford Street, London, SE1 9NT.

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