Floating Solar Panels

Neil Hudson Excerpts

Thursday 26th June 2025 Commons Chamber

[Lincoln Jopp]

My hon. Friend pre-empts one of the many benefits of floating solar that I will highlight to the House. He remembers his physics highers well, because the placing of floating solar reduces evaporation from the body that is covered by 70%. Given that the vast majority of the water in our reservoirs is lost through evaporation every year, we will save a great deal more water if the Government decide to pursue this technology at a grand scale.

Part of my coming here today is to speak to two large constituencies within this House. There are 543 constituencies that contain reservoirs or man-made water sources. Similarly, countless Members from across the House have very difficult decisions to make about putting solar farms on good agricultural land. Essentially, what has happened is that the whole discussion in this area has become a zero-sum game. It is a battle between food security and energy security, and there has seemed to be no way of unpicking that—until now.

Globally, floating solar has been put to practical application at large scale in China, India and Vietnam. The UK was formerly a leader in this space, because on the Queen Elizabeth II reservoir in 2016, a grand technology demonstrator was put on and plugged in, and it has been banging out 6.3 MW into Thames Water’s water treatment facility ever since. That is enough to power 2,000 homes. Given that floating solar covers less than 10% of that reservoir, I am sure that hon. Members can see the vast potential.

I want to talk about some of the benefits of floating solar, because they are legion. First, as hon. Members will have worked out already, there is the removal of the opportunity cost of putting floating solar panels on grade A agricultural land. If we do not have to put them all over Lincolnshire and we can put them on reservoirs, that land can be used for growing food.

[Dr Neil Hudson (Epping Forest) (Con)]

My hon. and gallant Friend is talking about the use of prime agricultural land, and food security is part of national security, as is energy security and, indeed, water security. However, there is a huge trend of prime agricultural land being devoted to solar plants, including in my constituency of Epping Forest, where a new plan is about to go in for a 237-acre plot between Thornwood and Epping Upland. He is articulating alternatives for the placing of solar panels, and there are plenty of such places up and down the land—brownfield sites, reservoirs, railway sidings, rooftops of agricultural buildings—so does he agree that we must protect prime farmland and the green belt, and make sure that solar panels go in the right places?

[Lincoln Jopp]

I completely agree with my hon. Friend. I hope we are going to give hope across the House and therefore across the country that this alternative solution to putting solar panels on grade A agricultural land is, to a certain extent, an answer to a maiden’s prayers. Not only does floating solar remove the opportunity costs of putting it on agricultural land, but one of its beauties is that it is twice as efficient as a land-based system. Land-based systems warm up because they are on the land, and as they warm up they become less efficient, whereas floating solar panels, because of the evaporative effect on the underside, remain automatically cool and 100% efficient throughout a sunny day.

--- Later in debate ---

[Lincoln Jopp]

On Tuesday, I visited the Queen Elizabeth II reservoir, which is a closed site owned by Thames Water. I am not aware that there were any fish there, but there was certainly bird life. It is important to make the point that the general planning norm and all the modelling have been based on covering only 15% of these reservoirs, in order to leave sufficient space for leisure use, including fishing, no doubt, and for bird life. The birds I saw on the Queen Elizabeth II on Tuesday were warming themselves very happily on the floating solar panels, because, of course, by being on the panels, they are predator free, as nothing can attack them there.

“How big could this be?”, I hear the House roar.

[Dr Hudson]

How big could this be?

[Lincoln Jopp]

I thank my hon. Friend for that.

The installed base of every single solar panel in the United Kingdom is producing 17 GW. If we were to cover 15% of man-made reservoirs in this country, we would double the national capacity, adding a further 16 GW without touching an inch of agricultural land. That is absolutely extraordinary. In so doing, we would create 80,000 jobs in the construction phase and 8,000 jobs in the maintenance phase.

My plea to the Minister—who I know is putting the finishing touches to the Government’s solar road map—is that floating solar should play a much greater part in the final road map than it did in the first draft. I am grateful to my right hon. and hon. Friends for their support; I hope this debate has been educational and informative, and that they are now fully signed up to the floating solar brethren and sisterhood, which will go forth from this place and evangelise for the good cause.