1MW Commercial Solar Cost
1MW Commercial Solar System Cost & Payback UK 2026
A 1MW commercial solar system fits national distribution centres and similar properties with approximately 5,600 m² rooftop or 2 hectares ground-mount of usable roof. Annual savings around £285,000, payback in 2.8–3.5 years.
1MW
System size
~950k
Annual kWh
£285k
Annual saving
2.8yr
Payback (low)
A 1MW commercial solar system is one of the most common UK rooftop sizes — sized for national distribution centres, ground-mount commercial farms, major manufacturing plants, large multi-tenant industrial parks. This page gives you the live 2026 cost, generation, savings, and payback numbers, taken directly from our installed fleet. No marketing fluff: real numbers from real installs.
1MW Solar System — Quick Numbers (UK 2026)
Here is what a 1MW commercial solar PV system typically delivers across the UK in 2026:
- Typical panel count: ~2200 panels at 455 Wp tier-1 monocrystalline.
- Roof area required: approximately 5,600 m² rooftop or 2 hectares ground-mount of usable, south-facing or east/west roof.
- Annual generation: ~950,000 kWh per year (UK national average — Midlands).
- Installed cost: £800,000–£1,000,000 including VAT, design, supply, install, DNO, commissioning.
- First-year saving: £275,000–£285,000 (assumes 80% self-consumption, 20% export at SEG rates).
- Simple payback: 2.8–3.5 years before any AIA or finance is applied.
- 25-year lifetime savings: £7,125,000+ at current grid prices.
1MW Solar System Cost Breakdown
The £800,000–£1,000,000 install range for a 1MW system breaks down approximately as:
- Panels (45%): tier-1 monocrystalline panels (JA Solar, Trina, Longi, Jinko) — £360,000–£450,000
- Inverters (15%): string or central inverters (SolarEdge, SMA, Huawei) — £120,000–£150,000
- Mounting & cabling (12%): roof-rated mounting hardware, DC cable, AC cable — £96,000–£120,000
- Installation labour (15%): rigging, electrical, MCS commissioning — £120,000–£150,000
- Design, DNO & paperwork (8%): structural sign-off, G99 application, MCS pack — £64,000–£80,000
- Contingency (5%): scaffolding, weather, late-stage variations — £40,000–£50,000
1MW Solar System Payback Analysis
A 1MW system installed in 2026 pays back in approximately 2.8–3.5 years for most UK businesses. The exact figure depends on three factors:
- Self-consumption ratio. Higher daytime electricity use = faster payback. A 1MW system feeding a 24/7 industrial load pays back ~6–8 months faster than one feeding a 9-to-5 office.
- Grid tariff. Businesses paying 30p+/kWh see paybacks at the lower end (2.8 years); businesses on legacy contracts at 18–22p/kWh see paybacks at the upper end.
- Finance route. Capital purchase has the fastest paper payback. PPA gives day-one cashflow positive without capital outlay. Asset finance over 7 years often gives a net-positive monthly position from month one.
What Properties Suit a 1MW System?
A 1MW commercial solar system is a strong fit for national distribution centres, ground-mount commercial farms, major manufacturing plants, large multi-tenant industrial parks. The roof must offer approximately 5,600 m² rooftop or 2 hectares ground-mount of usable space — clear of significant shading, plant rooms, skylights, and rooflights. Roof age matters: panels carry 25-year warranties and are typically not lifted off mid-life, so the underlying roof should have ≥10 years of remaining life. Where the roof is older, our team specs a coordinated roof-and-solar refurbishment.
Tax Treatment of a 1MW Solar Investment
For UK companies, a 1MW solar system qualifies for either:
- Annual Investment Allowance (AIA): 100% first-year capital allowance up to the AIA cap (£1m as at 2026). For most 1MW systems, 100% of the install cost can be written off against the company's taxable profit in year one.
- Full Expensing: 100% deduction on main-pool plant for limited companies. Full Expensing is now permanent for solar PV under HMRC's 2024–2026 capital allowances reform.
For a £800,000–£1,000,000 install at 25% corporation tax, the post-tax effective cost reduces to £600,000–£750,000. Always confirm allowances with your accountant before committing.
Get a Fixed-Price 1MW Solar Quote
Send us your last 12 months of half-hourly meter data plus a sketch (or postcode) of the building. We will return:
- A specific 1MW system design tailored to your roof — panel count, layout, orientation, inverter sizing.
- An accurate annual generation forecast modelled in PVSyst from your local irradiance data.
- A first-year and 25-year saving forecast based on your actual tariff structure (not generic averages).
- A fixed-price quote inclusive of design, supply, install, DNO, commissioning, MCS handover.
The desk feasibility takes 3–5 working days and is free. From signed proposal to commissioned system: typically 8–14 weeks.
Frequently Asked Questions
What is a 1MW solar system?
A 1MW (kilowatt) commercial solar PV system uses approximately 2200 solar panels with a combined nameplate capacity of 1000 kilowatts. It generates around 950,000 kWh of electricity per year in the UK, enough to offset 60–90% of typical commercial electricity usage.
How much does a 1MW solar system cost in the UK?
As of 2026, a 1MW commercial solar system costs £800,000–£1,000,000 fully installed in the UK. This includes panels, inverters, mounting, cabling, electrical work, design, DNO application, MCS commissioning, and 25-year output warranty.
How much will a 1MW solar system save me?
A 1MW system typically saves £275,000–£285,000 per year, depending on grid tariff, self-consumption, and export rates. Over the system's 25-year warrantied life, lifetime savings are typically £6,270,000+ even after accounting for panel degradation.
How long does a 1MW solar install take?
From signed contract to commissioning: typically 8–14 weeks for a 1MW rooftop system. This includes 1–2 weeks design and DNO submission, 4–8 weeks lead time for panels and inverters, 1–3 weeks of on-site install, and final MCS commissioning.
What roof size do I need for a 1MW system?
A 1MW solar system requires approximately 5,600 m² rooftop or 2 hectares ground-mount of usable roof. The roof should be south, east, or west facing, with no major shading from neighbouring buildings or trees. Flat roofs work well using ballasted mounting at 10–15° tilt; pitched roofs use rail-mounted in-line systems.
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1MW Solar: Planning, Grid and Structural Considerations
A 1MW commercial solar system is a significant infrastructure project that requires careful pre-installation planning across three technical areas: planning consent, grid connection and structural engineering. On the planning side, 1MW rooftop solar on a single commercial building usually proceeds under Class A permitted development (no application required), but ground-mounted 1MW systems require full planning permission in all local authorities. Many local authorities have specific renewable energy policies that support solar generation at this scale, but visual impact assessments and ecological surveys are typically required.
Grid connection for a 1MW system always requires a G99 application to the relevant DNO, plus a load flow study and sometimes a protection coordination study. DNO reinforcement — adding a new transformer or upgrading cable — may be required on some sites, adding £50,000-£250,000 to project costs. Self-consumption-first designs (sized to stay within the site's own demand rather than exporting to the grid) can sometimes avoid reinforcement costs entirely, with battery storage absorbing any generation that exceeds instantaneous consumption.
1MW Solar: Planning, Grid and Structural Considerations
A 1MW commercial solar system is a significant infrastructure project that requires careful pre-installation planning across three technical areas: planning consent, grid connection and structural engineering. On the planning side, 1MW rooftop solar on a single commercial building usually proceeds under Class A permitted development (no application required), but ground-mounted 1MW systems require full planning permission in all local authorities. Many local authorities have specific renewable energy policies that support solar generation at this scale, but visual impact assessments and ecological surveys are typically required.
Grid connection for a 1MW system always requires a G99 application to the relevant DNO, plus a load flow study and sometimes a protection coordination study. DNO reinforcement — adding a new transformer or upgrading cable — may be required on some sites, adding £50,000-£250,000 to project costs. Self-consumption-first designs (sized to stay within the site's own demand rather than exporting to the grid) can sometimes avoid reinforcement costs entirely, with battery storage absorbing any generation that exceeds instantaneous consumption.