About Matched
About
Matched is an independent, open-source, not-for-profit initiative that publishes verifiable ratings of the renewable electricity UK suppliers actually deliver - hour by hour, all year.
Many suppliers describe their tariffs as '100% renewable' yet the reality varies widely. Some successfully deliver electricity that is predominantly renewable, whereas others rely on outdated accounting practices which vastly overstate clean credentials.
The Matched Clean Power Index translates public data from Elexon, NESO, and Ofgem into clear, comparable ratings. Our methodology has been reviewed by 30+ organisations across the sector, including Oxford, Imperial, and several suppliers. We work with experts to highlight best practices, with consumer groups to inform households and businesses, and with policymakers to shape stronger standards.
Our mission is to accelerate the practices that most rapidly decarbonise power.
Why this matters
The current system for tracking clean energy is over 20 years old, and was designed when renewables generated less than 3% of Britain's electricity. It allows suppliers to claim '100% renewable' by purchasing annual certificates that allow excess summer solar generation to be used as an offset for winter gas consumption.
Now that renewables provide more than 50% of the nation's power, annualised certificates increasingly overstate the cleanliness of power.
And yet some suppliers are already going beyond annualised certificates to secure stable renewable supply, hour by hour, all year. Our ratings show which suppliers are doing the most to genuinely decarbonise their power.
For a deeper explanation, see our methodology or read our blog.
Our positions
We need hourly matching
Annualised certificates made sense when renewable energy was scarce but, as the grid has become increasingly renewable, we can no longer ignore the physical challenge of matching supply with demand. This requires accounting to be consistent with actual power flows - which is to say hourly.
Hourly matching cannot mean 100% matching, yet
100% hourly matching isn't feasible or desirable in the near term. The purpose of hourly matching is to increase transparency, enable more informed consumer choices, and honestly acknowledge that a 100% renewable grid remains a significant challenge.
REGOs remain the source of truth
As the regulated framework and the only universal system for tracking renewable claims in the UK, Renewable Energy Guarantees of Origin (REGO) certificates remain the source of truth - what we do is to add hourly fidelity.
Consumers need better data
Consumers have more choice than ever. Matched provides the information needed to make informed decisions about the products they choose.
Our recommendation
We invite suppliers to report hourly matching scores alongside their fuel-mix disclosures, and to work with Matched to refine and extend our methodology. Voluntary adoption of this practice would demonstrate leadership, build consumer trust, and catalyse regulatory evolution.
People
Joe Kwiatkowski
Joe has spent twenty years in the energy sector and over a decade in Silicon Valley, California. He held several senior leadership roles at Tesla, including in the Energy organisation where he managed the teams that built battery optimisers and managed gigawatts of energy storage projects around the world. Joe has a PhD in physics and held research positions at Cambridge University, Imperial College, and Stanford University.
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Benedict Shegog
Benedict joined the energy sector in 2021 and leads special projects at Granular Energy, a startup that helps suppliers trace clean energy through the grid. His work spans new market development, hands-on product and engineering, and regulatory engagement. Before energy, he spent five years building fintech products in London and Nairobi.
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Contributors
We're supported by leading organisations from across the sector, including policy-makers, standards bodies, accountants and service providers, data providers, power-system consultants, and suppliers.
Contact
Get in touch at contact@matched.energy for enquiries, partnerships, or feedback about our work.
You can also connect with us on LinkedIn.