Energy Technology List home
Department for Business, Energy and Industrial Strategy

Energy Storage on the ETL: criteria, testing and more

Energy Storage on the ETL: criteria, testing and more

Your Energy Storage products listing means more ways for businesses to save energy and money

Energy storage systems can store energy during periods of low demand and then use it when demand is high, helping to reduce costs and environmental impacts. It’s a rapidly developing field, offering a range of energy and cost-saving benefits for businesses and the public sector, and is an important technology to help towards decarbonising the UK on our path to Net Zero.

Energy storage systems have many uses, ranging from self-consumption and microgrid applications to large-scale storage. These systems can provide ancillary services to grid operators or help reduce costs for end-users by storing excess energy ‘behind-the-meter’. The Energy Storage category is live and with many exciting uses that your product applications will make a reality.

At a glance: Battery Energy Storage

Find this sub-technology on our website here.

  • Scope includes three categories of Battery Energy Storage products: office building (< 20,000 kWh), small industrial/large business (< 90,000 kWh), large industrial (< 250,000 kWh)
  • Product performance to be tested according to BS EN IEC 62933-2-1:2018

At a glance: Thermal Energy Storage  

  • Scope includes commercial and industrial thermal energy storage (TES) products including applications for power generation, heating and cooling
  • The ETL Scheme covers two categories of TES products: small industrial/ large commercial, large industrial
  • There are no appropriate BS EN and/or IEC standards for testing TES products to determine conformity, therefore test requirements are outlined in the criteria in section 1.4.2

Find this sub-technology on our website here.

Eligibility and testing for both sub-technologies

To qualify under Battery and Thermal Energy Storage, products must meet certain criteria for capacity, energy density, lifespan, and round-trip energy efficiency. Acceptable methods of testing include in-house testing that's been verified or cross-checked by an independent body, witnessed testing, acceptance tests or field trials, independent testing, and representative testing.

This category came from industry demand

Energy Storage came to the ETL via a New Technology Proposal, meaning it was suggested by the community. You can learn more about the NTP process in this article on our website, which also shows you the process you can follow. The Energy Storage category includes Battery and Thermal Storage for commercial and industrial applications – the criteria for which involved detailed stakeholder consultation and was developed and determined through an independent study.

The inclusion of the Energy Storage category, like all others that we list, will continue to evolve – and new listings are now encouraged. Will you be the first manufacturer of energy storage technology to have a product approved in this category? Read the criteria now and apply to get listed.​​​