Hybrid renewable energy systems are sites that combine two or more technologies, typically wind or solar plus a battery, behind a single grid connection. In the UK industry the usual term is “co-located”. The main advantages are practical: the technologies share an expensive grid connection and the land, and the battery lets the site shift output into hours when electricity is worth more.
What hybrids do not do is guarantee uninterrupted power. On a still, dark winter evening, wind and solar can both be low at the same time, and most batteries on these sites cover hours, not days or weeks. A hybrid smooths output; it does not remove the need for other sources of supply.
How it works
A hybrid power plant puts generation and storage at one site, usually behind one connection to the grid. Instead of each technology needing its own connection, they share one. The battery charges when output is high or prices are low and discharges later, when demand and prices are higher.
In the UK, “hybrid” almost always means solar or wind plus a battery on one connection. Mixes with hydro and diesel backup are found mainly in small island systems, not on the mainland grid.
There is no single legal definition. India’s 2018 National Wind-Solar Hybrid Policy offers one benchmark: a plant counts as a wind-solar hybrid if one resource’s rated capacity is at least 25% of the other’s. That rule is meant to stop a token solar array or turbine being used to claim hybrid status.
Why co-locate at all? The answer in Britain is mainly the grid connection queue. The government’s Clean Power 2030 Action Plan (December 2024) said the queue for connections added up to 739 GW. Adding a battery to an existing or shared connection is one way for developers to avoid joining the back of that queue.
Real-world examples
Cleve Hill Solar Park, Kent
Cleve Hill, on the north Kent coast near Faversham and Whitstable, has 373 MW of solar panels and became fully operational in summer 2025. It was billed at the time as the UK’s largest solar farm, and the developer says it can power over 102,000 homes.
The battery is the second half of the project. The owner, Quinbrook, says 150 MW of storage is currently planned, out of up to 350 MW consented. It was due to be completed in 2026; we could not confirm that it is running yet. Once it is, the aim is to move some of the solar output from midday into the evening.
Whitelee, East Renfrewshire
Whitelee wind farm has 215 turbines with a combined capacity of 539 MW and is owned by ScottishPower. A 50 MW battery, with about one hour of storage, has operated alongside it since late 2022. According to ScottishPower, the battery provides grid services such as frequency response and reactive power as well as storing energy for later. That makes it an example of a hybrid whose value lies partly in helping keep the grid stable, not only in time-shifting.
Parc Cynog and Pen y Cymoedd, Wales
Vattenfall was an early adopter. In 2016 it added a 4.99 MW solar farm at Parc Cynog in Carmarthenshire, next to 11 existing wind turbines, using the wind farm’s existing grid connection. It also built a 22 MW battery at its 76-turbine Pen y Cymoedd wind farm in south Wales, which the company lists as co-located with the turbines.
Isle of Eigg: a small-scale hybrid
Hybrids also work at village scale. The Isle of Eigg, which has no connection to the mainland grid, runs on about 110 kW of hydro, four 6 kW wind turbines, 170 kW of solar and batteries that can run the island for up to 24 hours. Two 64 kW diesel generators provide backup. The community company says renewables have supplied about 95% of the island’s electricity since February 2008. It is a good model for remote places, but it is not how mainland hybrids are built.
United States
Berkeley Lab’s 2024 analysis of hybrid plants, as reported in the trade press, counted 469 operating hybrid plants in the US. Of these, 288 were solar plus storage, holding 7.8 GW of battery power and 24.2 GWh of energy storage. In 2023, 66 of the 80 new hybrids were solar plus storage, and about 47% of proposed capacity in US connection queues was hybrid.
Kennedy Energy Park, Australia
Kennedy Energy Park in Queensland combines 43.2 MW of wind, 15 MW of solar and a 2 MW / 4 MWh Tesla battery behind a single connection, about 60 MW in total, with backing from the Australian Renewable Energy Agency (ARENA). Its offtaker, CS Energy, calls it the “first large-scale hybrid renewable energy facility in the world”, which is the company’s own claim. CS Energy gives 2024 as the start of commercial operation, years after the planned 2019 date.
India
India has a formal policy for wind-solar hybrids, but delivery has been slow. About 1.44 GW of hybrid capacity had been commissioned by 31 December 2023, according to a government reply to the Lok Sabha, against a 2016 draft target of 10 GW by 2022.
What the numbers say
Hybrids sit inside a much larger national plan. The Clean Power 2030 Action Plan (December 2024) set these ranges for 2030:
| Technology | 2030 range | Capacity cited in the plan |
|---|---|---|
| Solar | 45–47 GW | 16.6 GW |
| Onshore wind | 27–29 GW | 14.2 GW |
| Offshore wind | 43–50 GW | 14.8 GW |
| Battery storage | 23–27 GW | 4.5 GW |
| Long-duration storage | 4–6 GW | 2.9 GW |
| Unabated gas (kept in reserve) | 35 GW | – |
Source: Clean Power 2030 Action Plan, DESNZ, December 2024. Figures are installed capacity, not output; how much a plant actually produces depends on its capacity factor.
The plan does not discuss co-location directly, but the connection reform that followed matters for it. On 8 December 2025 the National Energy System Operator (NESO) announced that 283 GW of generation and storage had been prioritised for connection (132 GW for 2030 and 151 GW for 2035), while more than 300 GW was not taken forward for now. Batteries made up 83.2 GW of the prioritised projects and solar 59.0 GW. Our news report on how Ofgem gave NESO extra time to issue grid connection offers covers part of that process.
On cost, we found no reliable, independent figures for how much a hybrid saves compared with separate sites. The clearest saving is the shared connection and land; anything beyond that depends on the site, the market and the battery’s role.
Limitations and honest assessment
- Short storage. A one- or two-hour battery cannot cover several days of low wind. This is why the Clean Power plan keeps 35 GW of gas in reserve.
- Both sources can drop together. A calm winter evening can leave wind and solar low at the same time.
- Projects take years. Kennedy Energy Park was planned for 2019 and began commercial operation in 2024. Cleve Hill’s solar was running in 2025, but its battery was still due for completion in 2026.
- Storage has its own footprint. Batteries bring environmental costs of their own, covered in our article on the environmental impact of battery technologies.
- MW is not MWh. A battery’s power rating (MW) says how fast it can deliver electricity; its energy rating (MWh) says for how long. Kennedy’s 2 MW / 4 MWh battery can deliver full output for about two hours.
The UK angle
For the UK, the hybrid story is mostly about the grid. With a connection queue measured in hundreds of gigawatts, sharing a connection between solar, wind and a battery is one of the few ways to get more out of the wires that already exist. Cleve Hill, Whitelee and Pen y Cymoedd show the main models: solar plus a large battery, and wind farms adding batteries for grid services.
For households, these schemes are a background factor rather than something to buy. Home solar with a battery follows a similar idea on a small scale; if you are considering it, figures depend on your home and tariff, so check current scheme rules on GOV.UK or with an MCS-certified installer. This is general information, not advice.
Frequently asked questions
What is a hybrid renewable energy system?
A site that combines two or more technologies, usually wind or solar plus a battery, behind a single grid connection. In the UK this is often called co-location.
What are the advantages of hybrid renewable energy systems?
The main advantages are a shared grid connection and shared land, plus the ability to store output and release it at more valuable times. Batteries at wind farms, such as Whitelee, also provide grid services like frequency response.
Do hybrid systems guarantee uninterrupted power?
No. Wind and solar can both be low at the same time, and most batteries on these sites store hours of output, not days. Backup from other sources is still needed.
What is a wind-solar hybrid?
A plant with both wind turbines and solar panels on one site. Vattenfall’s Parc Cynog in Wales, where solar was added beside existing turbines in 2016, is a UK example; Kennedy Energy Park in Australia combines wind, solar and a battery.
What is the difference between MW and MWh?
MW (megawatts) measures power, the rate at which electricity flows. MWh (megawatt-hours) measures energy, the amount stored or delivered over time. A 2 MW battery holding 4 MWh can run at full power for about two hours.
Are hybrid systems only for large projects?
No. The Isle of Eigg runs a community hybrid of hydro, wind, solar and batteries, with diesel backup. Most commercial hybrids, though, are large grid-scale sites such as Cleve Hill and Whitelee.