Commercial Blog

Solar Panels for Farm Buildings

George Riley 18 Mar 2020

UK farms produce about 10% of the country’s greenhouse gas emissions (due to cows, fertilisers, heavy machinery... and the fact that 71% of the UK is farmland) and pressure is mounting to address this, if we’re to meet our climate change mitigation ambitions.

The sector is soon to be hit by the upcoming Agriculture Bill and Environment Bill, the thrusts of which are said to ‘make the polluter pay’. Farming subsidies will shift to those who produce an environmental benefit from their land and work to minimise emissions.

Retailers and consumers are demanding more sustainable food sources, adding to the pressure on farmers.

The National Farmers Union has committed to net zero emissions by 2040. It estimates that savings of 3 Mt CO2e per year could be made by the use of land-based renewables - this is about 7% of the industry’s current total greenhouse gas emissions. So let's look at how solar panels for farm buildings can help make agriculture greener.

Energy usage on farms

On average, electricity accounts for 33% of energy used in agriculture. This breaks down into 15% for heating and 85% for ventilation, refrigeration, lighting and other appliances.

Electricity usage varies by what the farm produces, with some livestock much more energy intensive than others:

Electricity used per hectare on farmsData source: Defra.

It’s also interesting to see how this compares to the total energy used in the farming process (e.g. including vehicles):

Energy used per hectare on farmsData source: Defra.

This implies the biggest opportunities for renewable generation are in poultry, pig and dairy farming. The high usage in these farms is due to dense livestocks in shelters that have a high demand for heating and ventilation, or for processing in the case of dairy.

Of course, this is the case now - but what about in the future? As the world decarbonises, all industries will likely shift towards heating and vehicles powered by renewable electricity, rather than fossil fuels. Electric tractors and other farming machinery are already starting to break through. This has the potential to shift much, if not all, of a farm’s energy use to electricity.

How to incorporate solar

Farms often have two opportunities well suited to solar energy generation:

  • large, uncomplicated, exposed roofs;
  • tracts of non-arable land.

These can be taken advantage of for solar arrays to supply the farm’s electricity demand.

Rooftop solar can be installed on barns, warehouses, outbuildings or farmhouses. The best roofs are south-facing, and ideally have the main incoming electricity supply and distribution board in the same building. Asbestos roofs are rarely worth installing on.

Ground mounted panels can be installed on any unshaded land of a suitable size. It’s also worth noting that ground mounted systems can be raised to a height that allows smaller animals (such as sheep) to graze underneath, or to support wildflowers, pollinators and local biodiversity.

You could even increase generation through a solar tracker, which orients itself to capture maximum sunlight throughout the day. Back in 2011, we installed one on a farm in Northamptonshire that has seen a 45% higher yield than an equivalent fixed system.

solar tracker

Financing solar PV for farms

If you can, it’s worth investing your own money in solar PV so that you own the installation and all its accompanying benefits outright. But it is a sizeable upfront investment, so luckily there is another option:

  • Solar PPAs. A Power Purchase Agreement (PPA) is when an investor funds the installation and maintenance of a solar system on your property. In return, you sign a contract agreeing to purchase the solar energy generated at a set cost, lower than grid rates.
  • Commercial loans aren’t suitable for most PV installations. The repayment period is generally 5-7 years, which is less than the solar payback of 6-10 years. You would also have the loan on your balance sheet, which may negatively affect your credit rating.

Note that in 2014, the government cut subsidies for farmland used for solar panels in part due to aesthetic concerns… though since then, it has begun to prioritise the climate a little more.

Farming under solar panels

Obviously, having solar panels on the buildings where you’re using the electricity like milking sheds and heated barns is ideal and non-disruptive.

solar panels with sheep

When it comes to ground mounted panels, you need to consider how or if you will use the land beneath.

  • If you have enough space for a wild area, you can plant native wildflowers below and around the panels (so long as they do not overgrow them), which may encourage bees to pollinate your other crops.
  • You can also lift the panels to a height so grazing livestock can pass underneath them. This is only really practical for smaller animals like sheep, rather than cattle (which can damage the structures).
  • Agrophotovoltaics is an emerging industry. Researchers are experimenting with panels mounted so high that crops can still receive enough sunlight and machinery has space to operate in the fields under them.

Get involved

If you’re interested in learning more about installing solar panels on your farm, give us a call on 0118 951 4490 or download our free guide to commercial PV:

Download now

Topics: Solar PV

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