The UK is in the midst of an energy crisis, with soaring bills adding to the ongoing cost of living rises.
Climate change is getting worse too, making green energy sources such as wind and solar power more important than ever.
So what would the UK look like if it was powered entirely by renewable energy?
We’ve looked at what 100% renewable means, calculated how much space would be needed for clean energy, and put together a breakdown of renewable technologies.
What does a 100% renewable energy UK mean?
A 100% renewable UK means a country not using finite energy sources no natural gas, no oil, and no coal. All of the UKs energy has to come from renewables.
That means solar, wind, and hydropower, as well as geothermal and biomass energy.
The government has already committed to reaching net-zero emissions by 2050, which doesnt necessarily mean a UK powered completely by renewable energy.
Instead, it refers to a UK where any emissions are offset by either renewable sources or carbon capture.
Weve imagined what a UK using entirely renewable energy sources could look like instead.
100% renewable is more than just the power we use though; its also about infrastructure, food, and transport. Its a complete transformation of how the UK works.
One of the challenges facing the UK in reaching 100% renewable energy is our growing population. The government has predicted that by 2041, therell be 72 million people living here.
Thatll introduce additional strain on the grid, so its important the UK manages the introduction of more renewables to accommodate an extra five million or so people.
Renewable energy
The energy makeup of a 100% renewable UK needs to be diverse enough to meet the demands of a country.
That means having enough renewable energy options to turn to when one or the other dips, because its an unavoidable fact that they dont work 24/7.
To have enough choices, the UK will need to dedicate more territory than ever before to make sure a grid powered entirely by renewables can cope.
The average estimate for energy consumption in a 100% renewable UK is range from 1,500 terawatt hours (tWh).
Lets look at how some of the main renewable energy types could meet some of this demand, and roughly how much space wed need to allocate to them.
Wind power
The UK generated 75,610 gigawatt hours (gWh) of electricity from onshore and offshore wind in 2020, which is enough to power 8.4 trillion LED bulbs for an hour.
Thats 24% of the UKs total electricity generation for a year, including both renewable and non-renewable energy. The capacity for wind power in the UK is just over 24 gigawatts (gW) and its expected to rise to 40 gW by 2030.
Its hoped that the UKs wind power capacity will increase to 100 gW by 2050 enough to power 12.6 million homes a day.
Itll continue to be a mix of onshore and offshore wind, with onshore making up the bulk of the UKs wind generation.
The UK can generate around 60,000 gWh year from onshore wind. Thats some way off meeting the 1,500,000 gWh in a 100% renewable UK, so lets try and make up 1,250,000 gWh with offshore wind, while assuming the remaining 190,000 gWh is generated from other sources.
Using the widely recognised three watts per metre figure, it would take roughly 18,030 square miles, which is around 6.2% of the UKs marine territory.
Thats a lot of space to use, so a balance will have to be struck between wind, fishing, conservation zones, and shipping lanes.
For onshore wind, our 2023 National Home Energy Survey showed that the UK public is keen one in two Brits would be happy to live next to an onshore wind farm.
Solar power
Solar power capacity in the UK is at 14.6 gW, and will hopefully reach at least 85 gW by 2050 in line with the Climate Change Committees recommendation.
The UK used 294.4 tWh of electricity in 2021, with solar contributing around 13 tWh. Thats impressive, but capacity needs to increase were going to reach 100% renewable.
If we covered almost every roof in the UK with solar panels, and used just 0.5% of land for solar panels, we could generate around 170 tWh.
Or, if we just relied on solar farms, it would require roughly 1,930 square miles of land to provide a similar amount of power.
Acknowledging advancements in technology is important too. Solar power efficiency is improving all the time, and exciting technology like solar windows could mean the space needed to meet energy demands is actually far less than weve predicted.
Other solutions include thin-film solar panels, which are less efficient than standard solar panels, but can be installed on more extreme angles and work better in cloudy weather.
Hydropower
The UKs hydropower capacity has grown at a snails pace 1.5% of electricity came from hydro in 2013, and its only managed to reach 2.1% by 2022.
One of the key reasons behind hydropowers slow growth is the concern over displacing local communities, so the main focus has been on wave and tidal energy.
Its harder to estimate space here than with wind and solar, because wave and tidal energy technology doesnt have a standard design yet. With wind and solar, we already know the dimensions needed to generate any amount of power, meaning we know how much space is required.
Government estimates say wave and tidal energy could provide up to 20% of the UKs energy needs.
Even if we could reach 20% of current energy needs with hydropower, capacity would still have to be expanded significantly in a 100% renewable UK.
Want to learn more about hydropower in the UK? Check out our page: Whats The Potential of Hydropower in the UK?
Biomass
Because biomass power plants and boilers emit a significant amount of greenhouse gases, theres a debate about whether biomass belongs in the renewable category.
Ideally in a 100% renewable UK, wed provide all of our energy needs from clean renewables, such as solar, wind, and hydro power.
Biomass fuels, or bioenergy, can still play a part when theyre handled properly though. That means ensuring 100% of the carbon emissions from burning biomass is absorbed and stored.
Transport
Buses and trains
Fully electric buses and trains are key to a 100% renewable UK and were already making good progress.
London introduced its first fleet of all-electric buses less than six years ago. Now, the capital boasts 650 zero-emission buses and plans to convert the entire fleet by 2034.
Coventry is on track to become the first city in the UK to have an entirely electric bus fleet, with 300 vehicles expected on the streets by 2025.
38% of trains are electric too now, though the freight industry has a lot of room to improve just 8.5% of freight locomotives are electric.
Electric vehicles
A robust and reliable charging network is essential to a 100% renewable future, but right now, the infrastructure is not good enough.
The Eco Experts has investigated why so many EV chargers are broken, and found that 5.2% of the UKs public EV chargers werent working. If this were 5.2% of petrol stations, that would mean 450 stations unable to provide fuel.
This is a big issue when it comes to switching the UK to electric vehicles, which must happen if the country is to become 100% renewable.
There are already worrying signs. The government announced in 2021 that the number of chargers on UK roads would reach one million by 2030. To hit that target, 145,000 chargers would need to be installed every year.
It only gets worse when you look at projected sales for electric vehicles. To meet the current level of demand, the UK would need to install 507 EV chargers every day until 2035.
Home heating
Heat pumps
Heat pumps are one of the most exciting alternatives to traditional heating systems, because they don’t use gas, oil, or other polluting fuels.
Instead, they use either air in the case of air source heat pumps or the ambient warmth of the soil in your garden, in the case of ground source heat pumps. Theyre powered by electricity, so right now theyre expensive to run.
The price of electricity will go down when the UK becomes 100% renewable though, so heat pumps will become much more affordable.
Hydrogen boilers
The UK produces just 10 megawatts of energy with low-carbon hydrogen, which is far below what’s needed in a 100% renewable UK.
And unfortunately, low-carbon hydrogen is exactly that: low carbon. It’s neither entirely green nor carbon neutral, because emissions are still released into the atmosphere.
The government has been criticised for its hydrogen strategy because of this fact, as it defines low carbon as anything under the pollution levels of typical fossil fuels.
Its also expensive to produce green hydrogen, which is carried out via electrolysis the process of separating hydrogen from water.
For each kilogram of green hydrogen, it costs £3£5, which is a lot more expensive than the more polluting grey hydrogen £1.27 per kilogram.
Read about whats stopping the UKs hydrogen revolution for more information.
Summary
Its clear that a 100% renewable UK is a challenging target, but its absolutely one we must hit if the worst effects of climate change are to be avoided.
Itd also mean the UK becoming completely energy independent, so thered be no more panicking about interruptions to gas supplies, or wars that cause dramatic oil-price fluctuations for us.
