Nov 4, 2025
The true green energy index is now active.
A new transparency tool is scrutinizing the UK's claims of "100% renewable" tariffs by revealing the actual amount of clean electricity suppliers deliver hourly throughout the year.
The Matched Clean Power Index evaluates suppliers based on their renewable energy match per hour, using publicly available data and a peer-reviewed methodology.
Leading suppliers are already matching substantial demand with actual generation.
Good Energy tops the list at 88% with 0.4 TWh, followed by Bryt Energy at 78% (3.4 TWh), Drax Energy at 77% (14.7 TWh), Ecotricity at 71% (1.7 TWh), and Octopus at 69% (29.3 TWh).
Founder Joe Kwiatkowski points out that current regulations allow suppliers to purchase inexpensive summer REGOs to compensate for winter usage when gas is needed.
He believes that aligning renewable claims with hourly demand would restore trust and reduce dependence on expensive gas peaking plants.
The financial implications are significant, with Matched estimating that up to £1 billion annually goes into certificates that do not promote clean power during costly evening peaks when prices and emissions rise.
The move toward hourly accountability aligns with broader market trends. The GHG Protocol and Science Based Targets initiative are updating their guidance, and the UK's system operator has noted the advantages of hourly matching.
Some suppliers are already adjusting their practices.
So Energy collaborated with Matched to demonstrate that its "green" tariffs were 74% matched hourly across 0.7 TWh, compared to 50% across its entire portfolio.
Good Energy and Smartest are enhancing their offerings by providing hourly-matched tariffs to customers.
Nigel Pocklington from Good Energy highlighted the index as essential for transparency regarding the true sources of clean power.
Advocates argue that the index dispels misleading narratives. “Current rules allow suppliers to claim solar energy at night,” noted EnergyTag’s Killian Daly, who welcomed a change that incentivizes clean power during peak pricing times when gas would typically be used.
Matched intends to include nuclear in the index soon, which may improve the low-carbon rankings for British Gas, EDF, and Octopus.
Its open methodology combines Elexon demand data, NESO generation, and Ofgem REGOs, with annual updates planned.
“Suppliers are adhering to the rules,” Kwiatkowski stated. “However, with minor adjustments, we can transform a billion-pound loophole into genuine investments in renewables, storage, and flexibility.”
The Matched Clean Power Index evaluates suppliers based on their renewable energy match per hour, using publicly available data and a peer-reviewed methodology.
Leading suppliers are already matching substantial demand with actual generation.
Good Energy tops the list at 88% with 0.4 TWh, followed by Bryt Energy at 78% (3.4 TWh), Drax Energy at 77% (14.7 TWh), Ecotricity at 71% (1.7 TWh), and Octopus at 69% (29.3 TWh).
Founder Joe Kwiatkowski points out that current regulations allow suppliers to purchase inexpensive summer REGOs to compensate for winter usage when gas is needed.
He believes that aligning renewable claims with hourly demand would restore trust and reduce dependence on expensive gas peaking plants.
The financial implications are significant, with Matched estimating that up to £1 billion annually goes into certificates that do not promote clean power during costly evening peaks when prices and emissions rise.
The move toward hourly accountability aligns with broader market trends. The GHG Protocol and Science Based Targets initiative are updating their guidance, and the UK's system operator has noted the advantages of hourly matching.
Some suppliers are already adjusting their practices.
So Energy collaborated with Matched to demonstrate that its "green" tariffs were 74% matched hourly across 0.7 TWh, compared to 50% across its entire portfolio.
Good Energy and Smartest are enhancing their offerings by providing hourly-matched tariffs to customers.
Nigel Pocklington from Good Energy highlighted the index as essential for transparency regarding the true sources of clean power.
Advocates argue that the index dispels misleading narratives. “Current rules allow suppliers to claim solar energy at night,” noted EnergyTag’s Killian Daly, who welcomed a change that incentivizes clean power during peak pricing times when gas would typically be used.
Matched intends to include nuclear in the index soon, which may improve the low-carbon rankings for British Gas, EDF, and Octopus.
Its open methodology combines Elexon demand data, NESO generation, and Ofgem REGOs, with annual updates planned.
“Suppliers are adhering to the rules,” Kwiatkowski stated. “However, with minor adjustments, we can transform a billion-pound loophole into genuine investments in renewables, storage, and flexibility.”