Farm solar: 10kW to 1MW+ with cost per kW tables
Farms are uniquely well-suited to solar energy. Large roofs on barns, sheds, and outbuildings, plus available land, mean farming businesses can install much larger systems than residential properties—and the financial returns are often significantly better.
With electricity costs for agricultural businesses running at 25-35p/kWh, energy-intensive operations like milking parlours, grain dryers, cold storage, and irrigation can see dramatic bill reductions. Many farms are now generating income by exporting surplus power or leasing land for solar development.
This guide covers everything UK farmers need to know about solar in 2026—from small rooftop systems to large ground-mounted arrays, including costs, grants, planning rules, and which setup works best for different farming operations.
Farm Solar at a Glance
| System Size | Typical Use | Cost Installed | Annual Output | Annual Savings |
|---|---|---|---|---|
| 10-20kW | Small farm, single building | £10,000-£22,000 | 8,500-17,000 kWh | £2,000-£5,000 |
| 20-50kW | Medium farm, multiple buildings | £20,000-£50,000 | 17,000-42,500 kWh | £4,000-£12,000 |
| 50-100kW | Large farm, high consumption | £45,000-£95,000 | 42,500-85,000 kWh | £10,000-£25,000 |
| 100-250kW | Large mixed/dairy farm | £85,000-£225,000 | 85,000-212,000 kWh | £20,000-£60,000 |
| 250kW-1MW+ | Solar farm / land lease | £200,000-£800,000+ | 212,000-850,000 kWh | £50,000-£200,000+ |
Why Farms Are Ideal for Solar
Agricultural businesses have several advantages that make solar particularly attractive:
- Large roof areas: Barns, sheds, livestock buildings, and grain stores offer substantial unshaded roof space
- Available land: Marginal or unproductive land can host ground-mounted arrays
- High electricity costs: Commercial agricultural tariffs of 25-35p/kWh mean bigger savings per kWh generated
- Daytime energy demand: Most farming operations run during daylight hours, maximising self-consumption
- Three-phase power: Many farms already have three-phase electricity, simplifying larger installations
- Planning flexibility: Agricultural permitted development rights often allow larger systems without full planning
- Capital allowances: Farming businesses can claim tax relief on solar investment
- Grant availability: Agricultural grants can cover 25% or more of costs
Types of Farm Solar Installation
1. Roof-Mounted Systems (Most Common)
| Typical size | 10-100kW |
| Cost per kW | £900-£1,300 |
| Installation time | 3-10 days |
| Planning permission | Often not required under PD rights |
| Best for | Farms with large south-facing barn/shed roofs |
Roof-mounted systems on agricultural buildings are the most popular and cost-effective option. Modern barns and livestock buildings typically have large, unobstructed south-facing roof areas that are ideal for solar.
Pros
- Uses existing structures—no loss of productive land
- Lower cost than ground-mounted (no foundations or frames)
- Often covered by permitted development rights
- Panels can help insulate buildings (reducing heat loss/gain)
- Quick installation on steel-frame buildings
- Straightforward connection to farm electrical supply
Cons
- Roof condition must be good (20+ years remaining life)
- Asbestos roofs require removal before installation (significant extra cost)
- Roof orientation and pitch are fixed
- Structural survey needed to confirm load-bearing capacity
- Some older buildings may need roof reinforcement
Roof Suitability Checklist
- Is the roof south, SE, or SW facing?
- Is it free from asbestos? (Pre-2000 buildings may contain asbestos cement sheeting)
- Is the structure sound with 20+ years remaining life?
- Is it free from significant shading (trees, silos, other buildings)?
- Can it bear additional weight of panels (15-20kg/m²)?
2. Ground-Mounted Systems
| Typical size | 20kW-1MW+ |
| Cost per kW | £1,000-£1,500 |
| Installation time | 1-8 weeks |
| Planning permission | Usually required above certain thresholds |
| Land required | Approximately 1.5-2 hectares per MW |
| Best for | Farms with marginal land or insufficient roof space |
Ground-mounted arrays are installed on metal frames driven into the ground or set on concrete foundations. They’re ideal for farms with low-productivity land that could generate better returns from solar than from agriculture.
Pros
- No roof constraints—optimal orientation and tilt achievable
- Scalable to very large capacities (100kW+)
- Easier access for maintenance and cleaning
- Can combine with grazing (sheep graze beneath panels—”agrivoltaics”)
- No roof structural concerns
- Can use marginal or unproductive land
Cons
- Takes land out of primary agricultural production
- Higher cost per kW than roof-mounted
- Planning permission usually required
- Foundation/frame costs add to project price
- Longer cable runs to farm electrical supply
- Potential visual impact on landscape
- May affect Basic Payment Scheme (BPS) / Sustainable Farming Incentive eligibility on that land
3. Agrivoltaics (Solar + Farming Combined)
Agrivoltaics is the practice of combining solar generation with active agricultural use on the same land. This is a growing trend in the UK:
- Sheep grazing under panels: The most common approach. Sheep keep grass short (reducing maintenance), while panels provide shelter. Stocking density typically 50-70% of open pasture.
- Elevated panels over crops: Panels mounted 3-5m high allow machinery access beneath. Used for shade-tolerant crops like lettuce, berries, and herbs.
- Pollinator habitats: Ground under panels seeded with wildflowers to support biodiversity and pollinating insects.
Agrivoltaics can strengthen planning applications by demonstrating continued agricultural use of the land.
4. Solar Canopies and Carports
Solar panels mounted on canopy structures over farmyards, machinery parking areas, or livestock handling facilities. More expensive than roof or ground-mount but make use of otherwise unused space without taking land. Costs typically £1,300-£2,000 per kW.
How Much Do Farm Solar Panels Cost?
Farm solar systems benefit from significant economies of scale compared to residential installations. For more on commercial solar pricing, see our commercial solar panel costs guide.
Cost per kW by System Size
| System Size | Cost per kW (Roof) | Cost per kW (Ground) | Total Cost Range |
|---|---|---|---|
| 10kW | £1,100-£1,300 | £1,300-£1,500 | £11,000-£15,000 |
| 30kW | £950-£1,200 | £1,100-£1,400 | £28,000-£42,000 |
| 50kW | £900-£1,100 | £1,050-£1,300 | £45,000-£65,000 |
| 100kW | £850-£1,000 | £950-£1,200 | £85,000-£120,000 |
| 250kW | £800-£950 | £900-£1,100 | £200,000-£275,000 |
| 500kW | — | £850-£1,050 | £425,000-£525,000 |
Prices include panels, inverters, mounting, cabling, installation, and commissioning. VAT at 0% for installations under 1MW on agricultural buildings.
What’s Included
- Commercial-grade solar panels (typically 550-600W)
- String inverters (or central inverter for larger systems)
- Mounting system (roof clamps or ground frames)
- DC and AC cabling
- Metering and monitoring system
- DNO application and connection
- MCS or commercial certification
- Project management
Additional Cost Factors
- Asbestos roof removal: £25-£50/m² (common on pre-2000 farm buildings—can add £10,000-£30,000)
- Roof reinforcement: £2,000-£8,000 if structural upgrades needed
- Grid connection upgrade: £5,000-£50,000+ for larger systems requiring supply upgrades
- Battery storage: £400-£600 per kWh for commercial batteries
- Planning application: £300-£1,000+ if full planning required
- Ground-mount foundations: Included in ground-mount pricing above
For residential solar pricing comparison, see our guide to solar panel costs in the UK.
Best Solar Panel Types for Farms
Farm installations typically use different panels to residential systems, optimised for commercial-scale projects. Learn more about different solar panel types.
Commercial-Size Panels (550-600W)
| Panel size | 2.3m x 1.1m (approximately) |
| Power output | 550-600W per panel |
| Technology | N-type TOPCon (standard for 2026) |
| Efficiency | 21-23% |
| Cost per panel | £100-£150 (at volume) |
| Panels needed per 50kW | 85-90 panels |
Larger format panels reduce installation time and cost per kW because fewer panels, connections, and mounting points are needed.
Recommended Brands for Farm Installations
| Brand | Model | Power | Why It Suits Farms |
|---|---|---|---|
| JinkoSolar | Tiger Neo (commercial) | 570-585W | Best value, highest volume manufacturer, excellent warranty |
| Trina Solar | Vertex (commercial) | 560-580W | Outstanding reliability, proven in UK commercial projects |
| LONGi | Hi-MO 6 (commercial) | 555-575W | Strong efficiency, competitive pricing at volume |
| Canadian Solar | TOPBiHiKu7 | 600-620W | Highest power per panel, reduces installation labour |
| JA Solar | DeepBlue 4.0 (commercial) | 560-580W | Excellent cost-performance balance for large projects |
All these manufacturers are Tier 1 with strong financial backing—important for 25-30 year warranty confidence on a significant investment.
Inverter Options for Farms
- String inverters (10-50kW): Most common for farm rooftop systems. Brands like SMA, Huawei, Solis, and GoodWe offer commercial ranges. Cost: £0.05-£0.10 per watt.
- Central inverters (50kW+): Single larger inverter for bigger systems. More cost-efficient at scale but single point of failure.
- Multiple string inverters: Often preferred for large systems—if one fails, the rest keep generating.
How Much Can Farms Save?
Farm savings are typically much higher than residential because of higher commercial electricity rates and greater self-consumption during daylight hours.
Savings by Farm Type
| Farm Type | Typical System | Annual Consumption | Self-consumption | Annual Savings |
|---|---|---|---|---|
| Arable (small) | 20-30kW | 15,000-25,000 kWh | 40-55% | £3,000-£6,000 |
| Dairy | 50-100kW | 50,000-100,000 kWh | 55-70% | £12,000-£30,000 |
| Poultry | 30-80kW | 30,000-80,000 kWh | 60-75% | £8,000-£22,000 |
| Livestock (mixed) | 20-50kW | 20,000-45,000 kWh | 45-60% | £4,000-£12,000 |
| Horticulture/Nursery | 30-100kW | 30,000-120,000 kWh | 50-65% | £8,000-£30,000 |
| Large mixed farm | 100-250kW | 80,000-200,000 kWh | 50-65% | £20,000-£55,000 |
Payback Period
Farm solar systems typically pay back in 4-7 years—significantly faster than residential:
- Small system (10-30kW), no grant: 5-7 years
- Medium system (30-100kW), no grant: 4-6 years
- Large system (100kW+), no grant: 4-6 years
- Any system with 25% grant: 3-5 years
With panel lifespan of 25-30 years, farms can expect 20-25 years of essentially free electricity after payback.
Example: 50kW Dairy Farm System
| System cost | £50,000 |
| Grant (25%) | -£12,500 |
| Net cost | £37,500 |
| Annual generation | 42,500 kWh |
| Self-consumption (65%) | 27,625 kWh |
| Savings (at 30p/kWh) | £8,290 |
| Export income (at 10p/kWh) | £1,490 |
| Total annual benefit | £9,780 |
| Payback period | 3.8 years |
| 25-year net profit | £200,000+ |
Grants for Farm Solar Panels
Several grant schemes are available to help UK farms invest in solar:
Farming Investment Fund — Improving Farm Productivity Grant
| Grant rate | 25% of eligible costs (40% for young farmers) |
| Minimum grant | £15,000 |
| Maximum grant | £250,000 |
| Eligible items | Solar panels, inverters, batteries, installation |
| Requirement | Must be for agricultural business use |
This is the primary grant for farm solar installations. You need to demonstrate that solar will improve your farming operation’s productivity and reduce costs. The 25% contribution significantly improves payback periods.
Farming Equipment and Technology Fund (FETF)
| Grant rate | 25% (40% for young farmers) |
| Minimum grant | £2,000 |
| Maximum grant | £25,000 |
| Eligible items | Smaller solar systems, monitoring equipment |
Better suited for smaller installations (such as 10kW systems). Lower minimum threshold makes it accessible for farms wanting modest systems.
Rural Community Energy Fund
Supports community-owned renewable energy projects in rural areas. Can fund feasibility studies and development costs for larger solar schemes.
Scotland: Agri-Renewables Fund
Scottish farms can access additional support through Scottish Government schemes. Check with Scottish Enterprise or local SGRPID office for current availability.
Wales: Rural Investment Scheme
Welsh farms may access funding through the Welsh Government’s rural development programme. Contact Farming Connect for guidance.
Northern Ireland: DAERA Farm Business Improvement Scheme
Northern Irish farms can apply for capital grants for renewable energy equipment through DAERA schemes.
0% VAT
All solar installations on agricultural buildings benefit from 0% VAT (extended through at least 2027), the same as residential. This applies to panels, inverters, batteries, and installation labour.
Capital Allowances
Farming businesses can claim tax relief on solar investment:
- Annual Investment Allowance (AIA): 100% first-year relief on qualifying expenditure up to £1 million. This means the full cost of a solar system can be deducted from taxable profits in the year of purchase.
- Full expensing: For incorporated farm businesses, 100% first-year capital allowances on qualifying plant and machinery.
Combined with grants, capital allowances can make the effective cost of farm solar significantly lower than the headline price. Consult your farm accountant for specific tax benefits.
For details on residential grants, see our guide to solar panel grants and schemes.
Planning Permission for Farm Solar
Permitted Development Rights
Agricultural businesses benefit from permitted development (PD) rights that allow certain solar installations without full planning permission:
Roof-Mounted (Agricultural Buildings)
- Generally permitted on agricultural buildings without planning permission
- Panels must not protrude more than 200mm from the roof surface
- Must not be on a listed building or within a Scheduled Monument
- Prior notification to local authority may be required
- In National Parks, AONBs, or Conservation Areas: additional restrictions may apply
Ground-Mounted
- Permitted development allows up to certain area thresholds on agricultural land
- Must be within the farm holding and reasonably necessary for agricultural purposes
- Larger arrays typically require full planning permission
- Prior approval from local authority usually needed
When Full Planning Permission Is Needed
- Ground-mounted systems exceeding PD thresholds
- Systems in National Parks, AONBs, World Heritage Sites, or Conservation Areas (for ground mount)
- Installations on listed buildings
- Large-scale solar farms (typically 5MW+, classified as Nationally Significant Infrastructure Projects)
Planning Tips
- Pre-application advice from your local planning authority is usually free and worthwhile
- Landscape and visual impact assessments may be needed for larger ground arrays
- Ecological surveys (particularly for ground nesting birds) may be required
- Agricultural land classification matters—BMV (Best and Most Versatile) land faces more scrutiny
- Demonstrating continued agricultural use (agrivoltaics) strengthens applications
Grid Connection for Farm Solar
Farm solar installations need to connect to the electricity grid, and this can be one of the biggest challenges—and costs—for larger systems.
Connection Process
| System Size | Connection Type | Process | Typical Timeline |
|---|---|---|---|
| Up to 3.68kW | G98 (notify) | Simple notification | Immediate |
| 3.68kW-50kW | G99 (apply) | Application to DNO | 4-11 weeks |
| 50kW-1MW | G99 (apply) | Detailed application, may need study | 3-6 months |
| 1MW+ | Formal connection | Full connection agreement | 6-18 months |
Grid Capacity Challenges
Many rural areas have limited grid capacity, which can restrict how much solar you can export. Options if grid capacity is constrained:
- Export limiting: System generates freely but limits export to grid capacity. You use or store the rest.
- Battery storage: Store excess generation for later self-consumption rather than exporting
- Flexible connection: Accept curtailment during peak periods in exchange for quicker/cheaper connection
- Behind-the-meter: Size system to match on-site demand, minimising export requirement
- Grid upgrade: Pay for supply upgrade (can be expensive: £10,000-£100,000+)
Battery Storage for Farms
Adding battery storage to a farm solar system can increase self-consumption and reduce peak demand charges:
Commercial Battery Options
| Battery Size | Cost | Best For |
|---|---|---|
| 20-50kWh | £10,000-£25,000 | Small farms, shifting daytime generation to evening milking |
| 50-100kWh | £25,000-£50,000 | Medium farms, peak shaving, backup power |
| 100-250kWh | £50,000-£120,000 | Large farms, significant load shifting, grid services |
When Batteries Make Sense for Farms
- Mismatched generation and demand: Solar peaks midday but demand is early morning/evening (e.g., twice-daily milking)
- Peak demand charges: Batteries can reduce maximum import, cutting capacity charges
- Backup power: Critical for dairy farms where milking equipment failure causes animal welfare issues
- Grid revenue: Larger batteries can participate in grid balancing services for additional income
- Export limitations: If grid can’t accept full export, batteries store excess for later use
Solar by Farm Type
Dairy Farms
Dairy farms are among the best candidates for solar. High, consistent electricity demand from milking parlours, bulk tanks, vacuum pumps, and lighting means excellent self-consumption rates.
- Typical consumption: 50,000-120,000 kWh/year
- Recommended system: 50-100kW roof-mounted
- Key benefit: 65-75% self-consumption; milking happens during solar hours
- Battery consideration: Useful for early morning/evening milking sessions
- Special consideration: Backup power capability protects animal welfare
Poultry Farms
Poultry operations use substantial electricity for ventilation, heating, lighting, and automated feeding systems. Broiler houses and laying units often have large roof areas ideal for panels.
- Typical consumption: 30,000-100,000 kWh/year
- Recommended system: 30-80kW roof-mounted
- Key benefit: Ventilation runs during daylight = high self-consumption
- Special consideration: Panels can reduce roof heat gain in summer, improving bird welfare
Arable Farms
Arable farms have lower year-round electricity demand but often have large grain stores and barns with excellent roof space. Seasonal demand for grain drying and irrigation can align well with summer solar generation.
- Typical consumption: 10,000-40,000 kWh/year
- Recommended system: 15-50kW roof-mounted
- Key benefit: Grain drying demand peaks in late summer when solar output is strong
- Special consideration: Lower base load means more export; consider smaller system sized to base demand
Livestock (Beef/Sheep)
Livestock farms typically have moderate electricity consumption. Solar works well on cattle sheds, lambing barns, and handling facilities.
- Typical consumption: 10,000-30,000 kWh/year
- Recommended system: 10-30kW roof-mounted
- Key benefit: Ground-mounted + sheep grazing is an excellent dual-use option
- Special consideration: Lower consumption means system should be carefully sized to avoid over-investment
Horticulture and Nurseries
Greenhouses, polytunnels, cold stores, and irrigation systems create significant electricity demand. Horticulture benefits from solar particularly during growing season when both sunlight and demand are high.
- Typical consumption: 30,000-150,000 kWh/year
- Recommended system: 30-100kW+ (roof or ground)
- Key benefit: Demand and generation peaks align in spring/summer
- Special consideration: Cold storage runs 24/7—battery storage adds value
Diversified Farms (Glamping, Farm Shops, Barns)
Diversified enterprises like holiday lets, farm shops, wedding venues, and converted barns add to electricity demand and provide excellent justification for larger solar installations.
- Key benefit: Diversified income streams can all benefit from one solar system
- Special consideration: Split metering may be needed for different business areas
Income from Farm Solar Beyond Self-Consumption
Smart Export Guarantee (SEG)
Export surplus electricity to the grid at 4-15p/kWh. All systems up to 5MW are eligible. Your installer registers the system and you choose an export tariff.
Power Purchase Agreements (PPAs)
For larger systems (100kW+), you can negotiate PPAs directly with energy suppliers or commercial buyers. Fixed-price contracts of 5-15 years provide guaranteed income. Rates vary but typically 8-12p/kWh for 2026 contracts.
Land Lease for Solar Development
Farmers can lease land to solar developers without any capital investment:
- Typical lease payment: £800-£1,500 per acre per year
- Lease term: 25-40 years
- Land required: Typically 100+ acres for developer-led projects
- Benefits: Guaranteed income, no maintenance responsibility, no capital outlay
- Drawbacks: Land unavailable for farming (though sheep grazing often permitted), lower income than self-owned solar
Grid Services Revenue
Larger systems with battery storage can participate in National Grid balancing services (frequency response, demand-side response), generating additional income of £30-£80 per kW per year.
Asbestos: The Farm Solar Challenge
Many farm buildings constructed before 2000 contain asbestos cement roofing sheets. This is one of the biggest practical barriers to farm solar.
Key Facts
- Solar panels cannot be installed on asbestos roofs
- Asbestos must be professionally surveyed and removed before installation
- Removal costs £25-£50 per m² depending on type and access
- A typical 500m² barn roof removal: £12,500-£25,000
- New replacement roof adds a further £20-£40 per m²
The Silver Lining
While asbestos removal adds significant cost, it also means you get a new roof with 30+ year lifespan—perfectly aligned with your solar panel investment. Some farmers combine the cost and see it as a necessary building improvement that solar helps justify.
Grant funding may cover part of the asbestos removal cost if it’s integral to the solar project.
Step-by-Step: Getting Solar on Your Farm
- Assess your electricity usage: Review 12 months of bills to understand annual consumption, peak demand, and costs. Half-hourly data from your supplier is ideal.
- Identify suitable locations: Survey roof condition, orientation, shading. Consider ground-mount options on marginal land.
- Check for asbestos: Any building pre-2000 should be surveyed. Budget for removal if found.
- Apply for grants: Submit applications before committing to installation. The Farming Investment Fund has application rounds—check current deadlines with RPA.
- Get multiple quotes: Obtain at least 3 quotes from commercial solar installers experienced with farm projects. Ask for references from other farm clients.
- Check grid capacity: Your installer should apply to the DNO early—grid constraints can affect system design.
- Review planning requirements: Confirm whether PD rights apply or if full planning is needed.
- Consider financing: Options include grant + own capital, agricultural bank loans, lease agreements, or hire purchase.
- Installation: Typically 1-4 weeks depending on system size.
- Registration and monitoring: Register for SEG, set up monitoring, brief farm staff on system operation.
Financing Farm Solar
Farms have several financing options beyond paying outright:
Options Compared
| Method | Upfront Cost | Ownership | Best For |
|---|---|---|---|
| Cash purchase + grant | 75% of cost | Immediate | Best long-term return |
| Agricultural loan | None/low deposit | After repayment | Spreading cost over 5-10 years |
| Hire purchase | 10-20% deposit | After final payment | Fixed monthly payments |
| Operating lease | None | Lessor owns | Off-balance-sheet, lower risk |
| PPA (roof rental) | None | Third party | Zero investment, discounted electricity |
Many agricultural banks (AMC, Lloyds Agriculture, HSBC Rural) offer specific renewable energy loan products for farms at competitive rates.
Summary
| Aspect | Details |
|---|---|
| Best for | Dairy, poultry, horticulture (high daytime demand) |
| Typical system size | 20-100kW for most farms |
| Cost range | £20,000-£100,000 (before grants) |
| Grants available | 25% (40% young farmers) through Farming Investment Fund |
| Payback period | 4-7 years (3-5 years with grant) |
| 25-year savings | £100,000-£500,000+ depending on size |
| Best panel type | Commercial 550-600W N-type TOPCon |
| Tax relief | 100% AIA + 0% VAT |
| Biggest challenge | Asbestos roof removal on older buildings |
Farm solar is one of the best investments available to UK agricultural businesses in 2026. With payback periods of 4-7 years, grant funding covering up to 25%, full capital allowances, and 0% VAT, the economics are compelling.
Whether you’re powering a milking parlour, grain dryer, or poultry shed, solar can dramatically cut your energy bills while generating income from surplus export. The key is getting the system sized correctly for your specific operation—too small and you leave savings on the table, too large and you’re over-investing in export.
Get quotes from commercial solar installers with farm experience and apply for grant funding before committing. With proper planning, solar can provide 20-25 years of virtually free electricity after a rapid payback.
