The ‘Marginal Pricing’ Trap: Why Your Electricity Bill Follows Gas
For many UK households, it seems paradoxical: the country is investing heavily in wind and solar power, yet electricity bills continue to spike whenever global gas prices rise. Here’s due to a mechanism known as marginal pricing.
In the UK’s current market, the price of electricity is typically set by the most expensive energy source needed to meet demand at any given moment. More often than not, that source is gas. Even when renewables are providing the bulk of the power, the “marginal” cost of the final bit of energy—supplied by gas plants—determines the price for the entire system.
To set it simply, reckon of it like a football penalty shootout. Low-cost renewables are the first players called up, but when the pressure is on, gas steps up to the spot, and its score determines the final result for everyone.
Decoupling the Grid: The Move Toward Fixed Contracts
To stop global conflicts—such as the US-Iran war—from directly inflating domestic bills, the UK government is moving to weaken the link between gas and electricity. The primary strategy involves shifting how renewable energy is paid for.
Currently, many older renewable projects operate under a legacy subsidy scheme called the Renewables Obligation (RO). These projects receive support payments on top of the volatile market price. The government is now encouraging these generators to switch to voluntary, long-term fixed-price contracts.
This shift could affect approximately 35GW of generating capacity, representing about 30% of the UK’s total capacity. By locking in fixed prices, the government aims to ensure that when wholesale gas prices surge, the cost of renewable electricity remains stable, shielding consumers from the full force of the price shock.
The Role of Windfall Taxes
For generators that choose not to sign these fixed-price contracts, the financial landscape is changing. The Treasury has announced plans to increase the windfall tax on excess profits made by electricity generators in Great Britain, raising it from 45% to 55%.
The revenue generated from this tax increase is intended to support households and businesses struggling with the energy crisis, potentially offsetting the rise in the quarterly price cap.
Future Trends: Toward a Strategic Gas Reserve?
Whereas fixed contracts are a step forward, some experts argue that more radical changes are needed to fully protect the British public. One prominent proposal from the Common Wealth thinktank is the creation of a strategic reserve for gas plants.
Under this model, gas plants would be removed from the daily electricity market and only operated as a last resort. Instead of setting the market price, they would operate at a fixed price, effectively ending the “marginal pricing” era and allowing the lower costs of wind and solar to be passed directly to the consumer.
This transition, combined with the expansion of nuclear power and renewables, represents a broader shift toward “clean power” as a tool for national economic security.
Empowering the Home: Solar and EV Integration
Beyond grid-level changes, the trend is moving toward decentralized energy. The government is focusing on removing the “friction” associated with adopting green technology at home.
- EV Accessibility: New legislation aims to allow the installation of pavement “gullies,” enabling drivers without driveways to run cables to their cars without needing complex planning permission.
- Urban Solar: There is a growing push for “plug-in solar” options, which could allow residents in flats or rental homes to generate their own power and lower their monthly bills.
These measures are designed to complement the broader goal of reducing the UK’s reliance on gas, which currently accounts for about a third of the primary energy used across the economy.
Frequently Asked Questions
Why do my electricity prices travel up when gas prices rise?
This happens because of “marginal pricing.” In the UK, the most expensive source of energy needed to meet demand (usually gas) sets the price for all electricity generated, including cheaper renewables.
What is a windfall tax on energy generators?
This proves a tax on the excess profits made by energy companies during periods of high market prices. The UK government is increasing this tax from 45% to 55% to help fund support for struggling households.
Will fixed contracts for renewables lower my bill immediately?
While they create long-term stability, these measures may take time to implement. They are designed to prevent future price shocks rather than immediately lowering the current price cap.
What are pavement gullies for EV charging?
They are proposed infrastructure solutions that allow electric vehicle owners who do not have off-street parking to safely run charging cables across the pavement to their homes.
What do you think about the move to break the link between gas and electricity prices? Do you believe a strategic reserve is the right move for the UK? Let us know in the comments below or subscribe to our newsletter for more deep dives into the future of energy.
