Solar panels for pig farms: cut the cost of round-the-clock production
Solar panels for pig farms are one of the clearest wins in agricultural energy. A pig unit is not a seasonal, daylight-hours operation — it is a 24/7 climate-controlled production system where ventilation, heating and feeding never stop. That relentless, predictable demand is exactly what makes rooftop solar pay back so fast on a pig farm. Where an arable barn might export most of its generation, a pig house consumes nearly everything its panels produce, on site, the moment it is generated. This page covers system sizing, real costs, the equipment that drains your power, and the grants that bring a typical pig farm solar project down to a 1.6–2.6 year payback.
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Why pig farms are ideal for solar
Pigs are temperature-sensitive animals, and their housing reflects it. Unlike a cattle shed that tolerates wide swings, a pig unit holds tight environmental tolerances around the clock, and that demands continuous electrical load. Your load curve is unusually flat: ventilation fans run every hour of every day, farrowing houses keep heat lamps and underfloor warmth on for newborn piglets, weaner accommodation is held warm through the rearing phase, and automated feeding lines cycle through the daylight and beyond.
This baseload profile is the single biggest reason pig farms suit solar. Solar generates during daylight, and a pig unit’s daytime demand — ventilation ramping up as temperatures climb, feed milling and mixing running in batches, lighting on extended photoperiods to drive growth and breeding — lines up almost perfectly with the generation curve. The result is a very high self-consumption rate, often 70–90% on a correctly sized array. Every kWh you self-consume displaces grid electricity at the full retail rate, which is worth far more than the export tariff, and that is what compresses payback.
Energy is also a rising share of pig production cost — commonly 3–5% and climbing as tariffs stay volatile. During a summer heatwave, ventilation runs flat out and your bill spikes precisely when margins are squeezed; during winter, farrowing heat does the same. Because biosecurity and welfare rules mean you cannot simply switch systems off to chase cheaper half-hourly pricing, you are exposed to whatever the grid charges. Solar gives you a block of generation you own outright, insulating a large slice of consumption from that volatility. Pig houses also offer large, simple, south-facing roof spans — ideal, uncluttered mounting area that turns otherwise dead roof into a revenue and saving asset.
Typical pig farm solar system & costs
Costs scale closely with herd size and housing type. The figures below are representative ranges at roughly £600–£900 per kWp gross, with the net column showing cost after the FETF 40% grant and the 100% first-year Annual Investment Allowance applied to the residual:
| System size | Typical unit | Gross cost | Net after FETF + AIA | Payback |
|---|---|---|---|---|
| 40 kW | Single finishing shed | £30k–£36k | £15k–£19k | 1.6–2.2 yrs |
| 75 kW | Weaner + finisher houses | £52k–£64k | £26k–£33k | 1.8–2.4 yrs |
| 120 kW | Breeder-finisher with feed mill | £80k–£100k | £40k–£52k | 2.0–2.5 yrs |
| 200 kW | Multi-house integrated unit | £120k–£180k | £60k–£93k | 2.2–2.6 yrs |
Payback lands in the 1.6–2.6 year window because of the high self-consumption described above — pig units burn what they make. Smaller, single-shed systems often pay back fastest, as nearly all output is absorbed by an always-on load. Larger multi-house arrays sit at the upper end of the range but deliver far greater absolute savings across a 25-year-plus panel life. For a full breakdown of how these numbers are built up, see our agricultural solar panel cost guide.
Equipment & energy breakdown
Understanding where your power actually goes tells you how solar offsets it. On a typical pig unit the heaviest draws are:
- Ventilation and climate control — the largest single load on most units. Variable-speed extraction and circulation fans run continuously and ramp hard in warm weather, the exact hours solar generation peaks. Solar directly offsets this daytime ventilation demand kWh-for-kWh.
- Farrowing and weaner heating — heat lamps, heat pads and underfloor heating for piglets and weaners are a major year-round load, heaviest in cold spells. Where heating is electric, solar trims daytime consumption; where it is gas or oil, the electrical controls and circulation still benefit.
- Feed milling and mixing — on-farm milling and mixing of rations is energy-intensive and is usually scheduled in daytime batches, making it an ideal candidate to run straight off the array. Timing mill cycles to midday generation pushes self-consumption higher still.
- Automated feeding and water — feed augers, ad-lib dispensers, wet-feed pumps and pressurised water systems cycle through the day on a steady draw that solar covers comfortably.
- Slurry handling and lighting — slurry pumps, scrapers and agitation, plus extended-photoperiod lighting that drives growth and breeding performance, round out a baseload that rarely dips, even overnight.
Because so much of this load is daytime and continuous, a well-specified array on a pig farm self-consumes the bulk of its output. Adding battery storage extends the benefit into the night — capturing midday surplus to run overnight ventilation and feeding — and, critically, can keep essential ventilation and welfare alarms live during a grid outage, which at pig stocking densities is a genuine animal-welfare safeguard rather than a convenience.
Compare the demand profile with our other intensive-livestock sectors — the load curves on poultry farms and the heating and milking demand on dairy farms follow the same always-on logic that makes solar so effective across animal housing.
Grants and finance for pig farms
The funding stack for pig farm solar is genuinely generous, and most units use all of it at once. The Farming Equipment and Technology Fund (FETF) is the primary capital route in England, with rooftop solar PV appearing on its productivity and slurry-handling rounds — it covers up to 40% of eligible capital. Wales (Farm Business Grant), Scotland (CARES loans and FBP grants) and Northern Ireland (Farm Energy Efficiency Scheme) run equivalent devolved support.
On top of the grant, the Annual Investment Allowance lets you write down 100% of the residual investment against taxable profit in year one, up to the £1m cap — a powerful lever for a profitable pig business looking to reduce its corporation or income tax bill in the same year it invests. And the Smart Export Guarantee (SEG) pays you for any surplus exported to the grid, which matters most for larger arrays during low-demand spells such as between batches or after weaning.
For units that prefer to keep capital free, zero-upfront options work well: a Power Purchase Agreement lets you pay only for the solar electricity you use at a rate below your grid tariff, while asset finance over 5–10 years spreads the residual cost against the energy savings the system generates from day one. Our grants and funding guide walks through eligibility, deadlines and how to combine these routes without one cancelling out another.
Get a quote for solar on your pig farm
We provide free desk-based feasibility from your half-hourly meter data, sizing the array to your real baseload, then a fixed-price proposal within 7 working days. Structural surveys cover purlin spacing and roof-sheet condition before any install, asbestos-cement roofing is replaced under licence where present, and three-phase upgrades are coordinated with your DNO. We cover England, Wales, Scotland and Northern Ireland from regional installation hubs.
Typical pig farms install at a glance
- System size
- 40–200 kW
- Project value
- £38k–£180k
- Simple payback
- 4 years
- Grants
- FETF / Welsh FBG / Scottish CARES eligible
Common questions
How much do solar panels cost for a pig farm?
Pig farm solar runs roughly £600–£900 per kWp installed, so a 40 kW finishing-shed array costs around £30k–£36k and a 200 kW multi-house unit £120k–£180k gross. After the FETF 40% grant and 100% first-year Annual Investment Allowance, net cost typically falls by half, bringing most pig units to a 1.6–2.6 year payback.
What size solar system does a pig farm need?
Most pig units fit 40–200 kW depending on herd size and housing type. A breeder-finisher with farrowing houses, weaner rooms and a feed mill draws heavily day and night, so high self-consumption favours larger arrays. As a rule, size the system to your daytime baseload — ventilation fans, feed milling and lighting — rather than to roof area alone, to maximise self-use.
Why are pig farms especially well suited to solar?
Pig units run a genuine 24/7 baseload: ventilation never switches off, farrowing heat lamps and weaner heating run continuously, and automated feeding and milling cycle through the day. That flat, high-self-consumption demand means most generated kWh is used on site rather than exported, which is exactly the profile that delivers the fastest solar payback in agriculture.
Will solar panels keep ventilation running during a power cut?
A standard grid-tied array shuts down in an outage for safety, so it alone won't power fans during a cut. Pairing solar with battery storage and a changeover panel keeps critical ventilation and alarm circuits live — vital for pig welfare, since stocking density makes loss of airflow dangerous within minutes. Many units add 30–100 kWh of storage for exactly this resilience.
Can pig farms claim the FETF grant for solar?
Rooftop solar PV features on the Farming Equipment and Technology Fund (FETF) productivity and slurry rounds, covering up to 40% of eligible capital in England. Welsh, Scottish and Northern Irish farms use equivalent devolved schemes. Combine FETF with the 100% Annual Investment Allowance and Smart Export Guarantee payments — most pig units stack all three on a single installation.
Related pillar pages
- • Farm solar pricing 2026 — by system size
- • How much do solar panels cost on a farm? Full breakdown
- • UK farm solar grants 2026 — FETF, FBG, CARES, DAERA
- • 2026 grant application calendar
- • Finance options — capex, asset finance, PPA
- • How to choose an agricultural solar installer
- • Farm solar maintenance after installation
- • Farm solar glossary A–Z
- • Real installation case studies