Across Europe, record levels of renewable energy generation are creating an unexpected challenge: too much power at the wrong time. As solar and wind output continues to surge, energy systems are struggling to keep pace — prompting governments and grid operators to explore unconventional solutions, including offering cut-price or even free electricity during peak production periods.
A growing imbalance in Europe’s energy system
Renewable energy has expanded rapidly across the continent, driven by climate targets and the push for greater energy independence following volatile fossil fuel markets. However, electricity grids — many designed decades ago for steady, centralised generation from coal and gas — are increasingly ill-equipped to handle fluctuating supplies from wind farms and solar panels. In countries including the UK, Germany, France and the Netherlands, this has led to a growing reliance on “curtailment”, where renewable generators are paid to reduce output when supply exceeds demand. While necessary to maintain grid stability, the practice is costly and, critics argue, inefficient.
The UK explores discounted energy on sunny and windy days
In the UK, policymakers are now testing alternative approaches. The Department for Energy Security and Net Zero recently announced a pilot scheme offering households discounted electricity during periods of high renewable output, particularly on windy days. This initiative has been reinforced by the National Energy System Operator (NESO), which in its latest Summer Outlook (published 14 April) called for measures to actively increase electricity consumption when supply peaks. Under such schemes, households and businesses could receive financial incentives — including lower tariffs or direct payments — to use electricity at times of abundance. Jess Ralston, head of energy at the Energy & Climate Intelligence Unit (ECIU), suggested this could translate into tangible savings for consumers: switching on appliances like washing machines during sunny periods could result in notably cheaper energy bills.
Renewable energy reaches record highs in the UK
The shift comes as renewable generation in the UK reaches unprecedented levels. In 2025, renewables accounted for 44 per cent of the country’s electricity — a dramatic increase from just 3 per cent in 2000. According to NESO, supply could exceed demand at times during the summer months, particularly due to the rapid uptake of rooftop solar panels. This surge raises the prospect of the UK — traditionally a net energy importer — exporting electricity during peak periods. However, post-Brexit trading arrangements and similar renewable growth across Europe may limit export opportunities.
Why excess renewable energy creates problems
Electricity systems must maintain a precise balance between supply and demand in real time. If too much power enters the grid, it can destabilise frequency levels, increasing the risk of outages. Renewable energy introduces additional complexity. Output depends on weather conditions, making it harder to predict, while many installations — such as offshore wind farms — are located far from urban demand centres. Without sufficient storage capacity, surplus energy cannot easily be saved for later use. As a result, operators often resort to shutting down generation temporarily. Recent data highlights the scale of the issue. Germany, France and the Netherlands curtailed approximately 3.9 terawatt-hours of renewable electricity in 2025 — a 21 per cent increase on the previous year. These conditions have also led to more frequent periods of negative electricity pricing, where suppliers effectively pay consumers to use power.
The rise of home solar adds further pressure
The growing popularity of domestic solar panels is compounding the challenge. In the UK, installed solar capacity has more than doubled over the past decade, now reaching around 22 gigawatts — roughly equivalent to the output of 30 large coal-fired power stations. While this supports decarbonisation, it also makes demand patterns less predictable. On sunny days, many households rely less on grid electricity, reducing overall demand just as supply peaks. With additional uptake expected — including plug-in solar systems — the mismatch between supply and demand could widen further.
Could “free” electricity reduce costs?
The financial implications are significant. In 2025 alone, Great Britain spent £363 million on curtailment payments and a further £1 billion compensating for curtailed wind energy by switching to alternative sources such as gas. These costs are ultimately passed on to consumers through energy bills. Against this backdrop, incentivising electricity use during peak production periods may offer a more cost-effective solution. Encouraging households, factories and businesses to consume surplus energy could reduce waste, lower system costs and ease pressure on the grid.
A transitional solution as infrastructure evolves
Looking ahead, improvements in grid infrastructure and energy storage are expected to mitigate the issue. Investment in battery technology will allow excess renewable energy to be stored and deployed when needed, while ongoing electrification — particularly in transport and home heating — is likely to increase overall electricity demand. In the interim, however, flexible pricing and consumer incentives may play a key role in balancing Europe’s energy system.
Conclusion
As renewable energy continues to expand, managing periods of oversupply has become a pressing challenge across Europe. The UK’s move towards discounted or incentivised electricity use reflects a broader shift in thinking: rather than wasting surplus power, it may be more efficient to encourage consumers to use it. While not a permanent fix, such measures could help bridge the gap as energy systems adapt to a cleaner, more variable future.
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