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Building begins for new solar energy

Construction work has begun on a state-of-the-art solar panel project which will supply renewable energy to Addenbrooke's and the Rosie Hospitals.

Visualisation of solar panel structure over parked cars at Babraham park and ride

Situated at Babraham Road Park and Ride, and delivered by Cambridgeshire County Council, the 4,500 panels will transform the site into an energy source generating up to 2.5MW of green electricity and reduce CUH’s electrical carbon footprint by approximately 400 tonnes per year.

The energy will supply local charging for electric cars, buses and taxis, and the surplus will be purchased directly by Cambridge University Hospitals NHS Foundation Trust (CUH).

Aerial view visualisation of how the Babraham Park and Ride site will look when the solar panels have been installed over the parking bays

CUH launched its Action 50 Green Plan in April 2022, setting out how the Trust will save more than two thousand tonnes from our direct carbon emissions over the next three years and become a net-zero organisation by 2045.

The actions include upgrades to physical infrastructure, prioritising life-cycle assessed purchasing and helping all staff, patients and visitors to actively contribute.

The plan builds on the significant progress already made in addressing the climate emergency, and responds to the ‘Net Zero NHS’ plan published in 2020.

Richard Hales, energy and sustainability manager at CUH explains more about energy saving at CUH

Link: https://youtu.be/N_Qz4n1wHm8

Video transcript

00:00:03:09 - 00:00:04:14

My name is Richard Hales,

00:00:04:14 - 00:00:07:05

I’m energy and sustainability manager here at the Trust.

00:00:07:17 - 00:00:10:17

I’m going to talk to you today about some work we’ve been doing here

00:00:10:17 - 00:00:15:03

at the Rosie as part of our overall drive to reduce the carbon footprint

00:00:15:15 - 00:00:19:08

of the whole of our estate in terms of energy use.

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What we've been doing here up on the roof, is putting

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some photovoltaic solar panels up there.

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We put up

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quite a few panels two years ago, around 33 kilowatt output.

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We've connected those directly

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to the chiller plant, one of the chiller plants is up there.

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It runs by a direct current route through to that chiller

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where it is controlled by a very clever bit of power electronics

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that allows us to either store some of that energy, if the chiller plant

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doesn't need it, in some batteries.

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And also it controls the energy coming from the mains

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grid, which it would normally be powered by.

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So that we get the right mix, the optimum, the lowest carbon

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mix possible to run that chiller as efficiently as possible.

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We really are squeezing every kilowatt hour

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to the most efficient way we possibly can.

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We did that a couple of years ago and that's worked really well.

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It's been a great bit of kit and very successful for us.

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It's probably reduced the energy demand and lowered

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the carbon footprint about 40% on that bit of plant.

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About a year ago, we put it in for some public sector

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decarbonisation scheme money from government,

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we were successful in that, and so we've taken

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the same type of technology, but this time used it

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to run a heat pump down on level one of the Rosie.

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Again, we put some more photovoltaic panels up on the roof

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to provide some green power to it.

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The great thing about the heat pump is that it's replacing a chiller unit.

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So that will provide us with chilled water

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for air conditioning within the Rosie.

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But when you produce chilled water, you also end up

00:02:05:17 - 00:02:08:13

generating some heat because you've cooled it, you've taken the heat out of it.

00:02:09:07 - 00:02:12:15

What we've done there is take that heat and used it

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to warm up the domestic hot water going into the Rosie,

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so again, we really are squeezing every single bit of energy

00:02:19:11 - 00:02:22:07

we can out of the electricity that's

00:02:22:17 - 00:02:25:23

going into that heat pump.

Tackling the climate crisis is a clear commitment in our strategic priorities.

Carin Charlton, director of capital, estates & facilities management, CUH

Carin Charlton, director of capital, estates & facilities management, said:

"Our Action 50 Green Plan describes how we will accordingly reframe our decision making, strengthen collaboration across supply chains and deliberately drive down our carbon emissions.

“We are delighted to be working in partnership with Cambridgeshire County Council on this exciting project which will directly supply green energy to our hospital campus.

"This is one of many actions we are implementing to support our journey to becoming a net-zero organisation by 2045.”

The project is expected to be complete in Autumn 2023 and work will be carried out in three phases to keep as much of the car park open as possible at any one time.

Visualisation of planned solar panel structure over parked cars at Babraham Park and Ride

We are trying to make sure we squeeze every bit of value out of low carbon kilowatt hours.

Richard Hales, energy and sustainability manager at CUH

The Trust is also the first in the country to use sophisticated technology which chooses between solar, battery and mains energy.

This is used to deliver the lowest possible carbon heating and air-conditioning for mums and babies at the Rosie hospital.

It’s led to a 60 per cent carbon reduction and represents a major step towards the Trust’s highly ambitious, net-zero carbon future.

Richard Hales, energy and sustainability manager at CUH said:

“Being a 24/7 major acute hospital means CUH is a very intense consumer of energy, water, goods and materials.

“Front-line patient care, and all the associated support functions and campus infrastructure mean that each day CUH consumes the same amount of gas and water as a small town, and three times as much electricity.

“Our plan is to keep refining the technology whilst replicating and scaling up across our buildings in order to decarbonise our estate."

Further information about the new solar project at Babraham Park and Ride can be found at cambridgeshire.gov.uk.