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Our experienced auditors can help you comply with the Sustainability Criteria under the Renewables Obligation (RO), Renewable Heat Incentive (RHI) and Feed in Tariff (FiT) schemes. We offer sustainability audits for operators of biomass, biogas and bioliquid fuelled plants.

Financial Close Audit Report

The financial close audit report is a specific report required by OfGEM to demonstrate that you have achieved financial close in order to qualify for a Tariff Guarantee under the Non-Domestic RHI scheme. This audit is undertaken in accordance with ISAE3000 (revised) and provides assurance that suitable levels of funding are in place and committed to deliver the project ahead of a tariff guarantee being awarded.

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The Independent Report on Metering Arrangements (IRMA) is intended to verify to Ofgem that an installation seeking accreditation to the Renewable Heat Incentive (RHI) has metering arrangements in place which meet the RHI eligibility requirements, in accordance with the RHI Regulations.


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Our experience in helping our clients comply with the renewable energy subsidy schemes administered by Ofgem such as the RO, FiT and RHi schemes have led to many clients asking for advice to ensure their installations will be compliant with scheme regulations and ensuring the accreditation process is smooth and seamless.

Calibration Services


Calibration is vital to ensure the instrumentation monitoring critical control points and processes remains within specification. ACL provide accredited calibration for all temperature probes and temperature monitoring systems.

We can carry out on site temperature probe calibration or probes can be sent to us for in-house testing.