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P.J. Yates Ltd - Dairy Farm

The details milk all the difference

Ireton Home Farm is a 4th generation family run dairy farm in Derbyshire. The 300 acre farm has 100 milking cows in the Holstein herd with all fields down to grass except for 25 acres of forage maize and 80 acres of grain.

The farm consumes some 100,000kWh of electricity per annum with their peak usage during milking times in the early mornings and late afternoons.

Peter, Chris and Katie Yates contacted Mypower to explore the options and benefits that solar PV could offer their diary farm.

Making the most from solar PV by managing daytime consumption

The farm has just one electrical supply feeding both the farm buildings and their home. Whilst their Economy 7 energy tariff provides low cost electricity at night, their peak electricity consumption was during the day, when the rates were certainly not so favourable .

Mypower's Tom Sivil, recommended a 42kW system. The 120 panels will produce 34,000 kWh of electricity per year with an estimated 75% of which will be consumed onsite, saving the Yates £4,500 every year. 

A SolarEdge inverter and optimiser system were specified, providing the family with a user friendly and intuitive monitoring platform. Via a desktop login or the SolarEdge App, they can view their live generation and consumption data. This allows the Yates to better utilise their low cost solar, by 'storing' energy in hot water tanks at times of peak generation when milking isn't taking place. For example, when the farm is not consuming the solar electricity during milking, turning on hot water tanks or heaters during the day is the most efficient way to consume the solar electricity.

Farm savings

The solar PV system will help save Ireton Home Farm £4,500 per year and generates clean renewable electricity at an equivalent price of 6.37p/unit. This represents a saving of 60% when compared to grid supplied electricity costing 16p/unit and provides a ROI of 12%.

Low carbon milk

As the supply chain mounts pressure for suppliers to 'green' their products and evidence their carbon reductions, the Yates' can provide firm figures of their carbon savings. Over 9 tonnes of CO2 will be avoided per annum proving their commitment to sustainable farming.

Professional, knowledgeable and enthusiastic

"We were looking for the most effective way to reduce our electricity bill due to the predicted price rises. We obtained quotes from several companies, and Mypower proved to be the cheapest and most knowledgeable. Tom was enthusiastic and very helpful which gave us confidence in the company. Mypower were highly professional throughout the whole process, and we are very happy with the final result".                                        Peter Yates, Managing Director, Ireton Home Farm

Key facts and predictions

  • 42.6 kW (102 panels) installed by Mypower.
  • 34,260 kWh units of energy produced per annum.
  • £4,539 projected first year income and savings assuming 75% of electricity used on site.
  • 12.1% projected first year return on capital invested, before capital allowance benefits.
  • 6.37 p/kwh - equivalent forward purchase price of 788,994 units of electricity over 25 years including estimated O&M costs, and excluding potential Annual Investment Allowance tax benefit.
  • 9.4 tonnes of CO2 emissions avoided per annum.
  • 8.3 years system payback before finance, tax and capital allowance benefits.
  • £183,854 - 25 year income & savings after indexation
  • 60% saving from solar PV electricity compared to grid supplied electricity at 16 p/kWh.


Peter Yates,

Managing Director,

Ireton Home Farm

"Mypower were highly professional throughout the
whole process, and we are very happy with the final result."