When a tax generates so little revenue that abolishing it barely registers in a budget forecast, you have to ask what it was actually doing. The UK's Carbon Price Support — a floor price mechanism layered on top of the EU and then UK Emissions Trading Scheme — is scheduled for abolition in April 2028. The fiscal impact is negligible. The policy rationale had already hollowed out. What's left is a useful case study in how carbon pricing mechanisms outlive their purpose and why the politics of removing them are still harder than the economics suggest.
A Tax That Solved a Problem That No Longer Exists
The Carbon Price Support was introduced in 2013 with a specific target: accelerate the retirement of coal-fired power generation by making carbon-intensive electricity more expensive to produce. It worked. UK coal generation collapsed over the following decade, and the mechanism that drove that outcome became progressively less relevant as the coal fleet it was designed to kill shrank toward zero.
The problem is that a tax designed to price coal out of the market doesn't disappear once coal is gone — it keeps applying to whatever generation is left. In the UK's case, that means gas peakers and, more awkwardly, the legacy renewable fleet. Because UK wholesale electricity prices are set by the marginal generator (typically gas), the Carbon Price Support inflates the price floor for the entire market, including wind and solar assets that have no carbon costs to speak of. The tax became a windfall mechanism for generators who weren't its intended targets.
That dynamic is part of what drove the separate Electricity Generator Levy — a charge on exceptional receipts from wholesale electricity sold above a benchmark price, currently set at £82.61 per MWh for the 2026-27 period, with the rate recently increased from 45% to 55%. The government's own framing of that increase acknowledges the core distortion: legacy renewable generators can earn "windfall returns without any new costs or risks" because gas prices set the marginal price and the Carbon Price Support amplifies that effect. You end up taxing the windfall with one instrument while the other instrument helped create it.
The Revenue Was Already Gone
The fiscal case for abolition is straightforward to the point of being anticlimactic. Revenues from the Carbon Price Support were already forecast to dwindle to roughly £200 million by 2028-29 — a rounding error in a government budget of this scale. That's not a policy being wound down; that's a policy that had already wound itself down while remaining on the books.
What the abolition does accomplish is simplification. The UK is currently in active negotiations with the EU over linking their respective carbon markets, and those talks are exposing real structural differences — including disagreements over free permit allocations and emissions cap levels — that will need to be resolved before any linkage agreement is possible. A separate domestic floor price mechanism sitting on top of a market you're trying to harmonize with is an obvious complication. Removing it reduces one variable in a negotiation that already has too many.
The EU's own ETS review, due for a Commission proposal in mid-July, is expected to extend free permit allocations in exchange for domestic investment commitments — a further sign that both systems are in active flux. Aligning the UK's carbon pricing architecture with where the EU market is heading makes more sense than defending a floor price mechanism whose original rationale retired alongside the coal plants it was meant to close.
What the Abolition Doesn't Resolve
The honest accounting here cuts against both the critics and the cheerleaders. Removing the Carbon Price Support will not meaningfully lower electricity bills in any predictable way. If lower carbon costs reduce the effective price floor for gas generation, demand for gas may increase, which pushes up UK ETS allowance prices as more emissions enter the cap-and-trade system. The savings get recycled into permit costs. The net consumer benefit is uncertain at best.
The broader investment question — whether UK power sector capital allocation improves post-abolition — depends almost entirely on what replaces the price signal. The government's seventh carbon budget, which targets an 87% reduction in emissions below 1990 levels by 2040 and implies roughly £880 billion in investment over 25 years, requires a credible long-run carbon price signal to mobilize private capital. The Carbon Price Support was never that signal — it was a transitional mechanism that stayed past its welcome. But removing it without a clear successor framework for long-run price certainty doesn't solve the investment problem; it just removes one distortion while leaving the underlying question open.
Watch for the EU ETS revision proposal in mid-July and whether the UK-EU carbon market linkage talks resume after the postponed summit. Those two developments will do more to shape UK power sector investment conditions than the abolition of a £200 million tax that had already done its job.
