The Matched Clean Power Index launched on 27 October. It ranks UK suppliers by the renewable power they actually deliver, hour by hour. Now we're focused on making that data useful.
Carbon accounting has emerged as one of the most immediate applications. Companies calculating Scope 2 emissions have started asking whether they can use our underlying data. The answer is yes—and we're starting with Open Energy.
Why scope 2 carbon accounting needs temporal data
Most Scope 2 calculations rely on annual grid averages. A company buys "100% renewable" electricity, applies a zero emissions factor, and reports accordingly. But the grid doesn't work that way.
Renewable generation varies hour by hour. Wind drops on calm days. Solar disappears after sunset. When that happens, gas plants fill the gap. An SME using a "100% renewable" tariff during a winter evening is consuming fossil fuel power—but annual accounting obscures this reality.
Matched analysis shows matching scores ranging from 88% to 0% across UK suppliers. The gap between annual claims and physical delivery matters for companies trying to decarbonise properly. It matters even more for lenders assessing whether green finance is funding genuine progress.
What we're doing with Open Energy
Open Energy is building infrastructure to connect energy data systems. Perseus, their framework for automating SME sustainability reporting, enables companies to unlock green finance. We're exploring how our temporal matching data can support their work.
The technical approach is straightforward. Our methodology calculates half-hourly alignment between renewable supply and consumption using three public data sources: Elexon settlement data, NESO grid mix, and Ofgem Renewable Energy Guarantees of Origin (REGOs). This produces matching scores that reflect what electricity consumers actually received, not what annual certificates claim they received.
Integrating this data with Perseus will give SMEs and their stakeholders more accurate emissions calculations. Instead of applying crude annual factors, carbon accountants could use figures that account for temporal mismatches and supplier choice. A company genuinely committed to renewable power could demonstrate that commitment with data showing they chose a supplier delivering 88% temporal matching rather than 26%.
Gavin Starks, CEO of Icebreaker One, said: "The result of this collaboration is more reliable emissions reporting, better decarbonisation decisions, and stronger foundations for green finance. The data infrastructure already exists—what's needed is the connection between the systems that hold it. Open Energy is building that connection and we're pleased to have Matched Energy as part of that effort."
Making temporal data accessible
We're working with Open Energy because Perseus needs this data now. But carbon accountants, corporate buyers, and reporting platforms across the sector are asking the same questions.
The data exists. Elexon publishes half-hourly settlement. NESO tracks generation. Ofgem manages REGO certificates. Our methodology connects these sources to calculate temporal matching for every UK supplier. What's missing is convenient access—getting the data into formats that carbon accounting tools can actually use.
This matters because the frameworks are changing. The GHG Protocol is revising Scope 2 guidance to incorporate temporal considerations. Science Based Targets initiative is moving toward hourly accountability. Corporate energy buyers want suppliers who deliver clean power during high-demand periods, not just on paper.
We're focused on partnerships that make this data practical.
We want to hear from carbon accountants
If you're building carbon accounting tools, managing corporate energy procurement, or developing reporting platforms, the data exists to move beyond annual averaging. We want to help you use it.