200kW Commercial Solar Systems for UK Businesses

A 200 kW commercial solar install is solidly in industrial-scale territory. Per-kW economics improve again versus the 100-150 kW range — we typically quote £750-£950 per kW at this scale — and the size justifies a full project-managed delivery with dedicated structural engineering, witness testing arrangements with the DNO, and a multi-inverter string topology configured for redundancy. Capex sits within a single year's AIA headroom for limited companies (the £1m cap is well above £170k), but at this scale procurement timelines, DNO process and structural sign-off all need active management.

The 200 kW band is what we recommend for warehouses (5,000-10,000 sqm), factories running 1-2 shift production, large schools and college campuses, large hotels above 100 rooms with conference facilities, and food processing or temperature-controlled logistics. The common thread: 1,200+ sqm of roof in serviceable condition, three-phase 800 A+ electrical supply with adequate headroom, a daytime baseload comfortably above 50 kW, and corporation tax exposure that lets AIA do its work — at £170k capex, the £42.5k of year-one tax relief is decisive to the IRR calculation.

What 200kW looks like physically

A 200 kW system in 2026 uses approximately 370 tier-1 monocrystalline panels at 540-550 Wp each (Trina Vertex, JA Solar Deep Blue, Longi Hi-MO 6 or equivalent). With higher-output 600 Wp modules the count drops to around 333. You need approximately 1,200 sqm of usable, well-oriented roof area free of significant shading. Total array weight on a flat roof, including ballasted mounting, comes in around 18-22 kg per square metre — substantial enough that we always engage a chartered structural engineer at survey stage and frequently commission full structural calculations on the existing building rather than relying on as-built drawings. The electrical infrastructure is substantial: typically 3-4 commercial-grade three-phase string inverters (50-75 kW each — Sungrow SG-CX, Solis-S6, Huawei SUN2000-100KTL or SMA Tripower CORE) configured for redundancy, a galvanised-steel mounting system, an MCS-compliant DC and AC switchgear assembly with arc-fault and surge protection on every string, a dedicated PV consumer unit interface with kWh metering for SEG export, half-hourly monitoring with sub-string data, full G99 connection paperwork, and a chartered structural engineer's sign-off plus electrical sign-off witnessed by the DNO.

Cost breakdown for a 200kW install in 2026

Turnkey 2026 pricing for a properly specified 200 kW system runs £150,000-£190,000 plus VAT, working out at roughly £750-£950 per kW. The price band includes 370 tier-1 panels at trade pricing, a multi-inverter string topology for redundancy, an MCS-spec mounting system, all DC and AC cabling (typically 350-550 metres of DC cable plus 100-180 metres of AC cable sized for sub-2% voltage drop end-to-end), surge protection, fire-safe DC isolators, a dedicated PV consumer unit interface with kWh export metering, half-hourly monitoring with a dedicated cloud portal, scaffolding and access equipment (often man-lifts or MEWPs at this scale), structural sign-off, electrical sign-off, full G99 connection paperwork including Type Test certificates and witness testing arrangements with the DNO, 12 months of post-commissioning support, and 24-month performance warranty against modelled yield.

Where a 200 kW project goes over budget tends to be one of four known knowns: an asbestos-cement industrial roof needing licensed removal (£20,000-£55,000 at 1,200 sqm), three-phase headroom upgrade where existing supply has limited spare capacity (£10,000-£35,000 to the DNO), DNO reinforcement charges where local network is constrained (£0-£80,000 depending on area), or roof reinforcement where structural condition can't carry the array weight (£12,000-£45,000). We identify these at survey stage and quote them clearly on a separate line.

On AIA: 100% Annual Investment Allowance covers the full capex up to the £1m annual cap. A £170,000 install reduces a profitable limited company's corporation tax bill by £42,500 in year one (at the 25% main rate). That drops the effective net cost to roughly £127,500 before counting energy savings. The Land Remediation Tax Relief recovers an additional 50% of any asbestos-removal element through corporation tax — at 1,200 sqm of asbestos remediation that can return £12,000-£28,000 of additional relief.

Generation and savings

A typical UK 200 kW system generates 180,000-188,000 kWh in year one. We model this in PVSyst with site-specific Meteonorm 8.2 irradiation data, panel temperature derating, inverter clipping where relevant, and shading losses derived from Lidar-resolution 3D modelling. Self-consumption drives the project economics. A 200 kW system on a multi-shift industrial unit, food processing facility with continuous chiller load, or large hotel with year-round occupancy typically achieves 80-90% self-consumption. On a single-shift business or office portfolio, self-consumption drops to 65-75%. The difference between 70% and 85% on a 200 kW system is roughly £8,500 of additional annual benefit.

At 75% self-consumption with a 24p/kWh blended import price, a 200 kW system avoids around £33,000 of grid energy purchases per year. The remaining 46,000 kWh exports to grid at the SEG rate. At a blended 6p/kWh SEG rate that adds £2,760 of export income, taking total year-one benefit to around £38,000-£48,000. Simple payback on £170,000 capex (or £127,500 net of AIA) lands at 5.5-6 years. 25-year IRR is 14-18% and 25-year NPV at a 7% discount rate is approximately £600k-£780k.

DNO grid connection — G99 with active management

At 200 kW, full ENA G99 process applies: a Connection Application to your DNO including Type Test certificates for the inverter, witness testing arrangements with DNO commissioning engineers, ENA G99 forms, and a Statement of Compliance at commissioning. Standard DNO turnaround for the offer letter in 2026 runs 6-12 months on uncongested networks, sometimes 12-18 months in constrained areas. The application costs £1,000-£3,500 to file. Around 50% of 200 kW G99 applications get a standard offer with no reinforcement charge; the remainder face contributions ranging from £8,000 to £80,000+ for transformer, switchgear or upstream cable upgrades. Our process: file the G99 application within two weeks of contract signature, run design and procurement in parallel, time delivery to site for the week the connection offer is accepted. If reinforcement comes back high we have several options — re-engineer for export limiting, drop nameplate to 199 kW with curtailment, opt for self-consumption-only configurations with battery integration, or in extreme cases re-route the project to a different metering point on the same site. We re-file before any major capex commits.

Best-fit sectors for the 200kW band

From our 2025 install book, the 200 kW band overweighted across five sub-verticals. Warehouses (5,000-10,000 sqm) running general distribution, ambient or temperature-controlled storage where lighting, material handling and refrigeration drive consistent daytime load. Factories with 1-2 shift production (light manufacturing, food processing, packaging, chemicals, plastics) — these almost always have the highest self-consumption rates. Large schools, sixth-form colleges and university satellite campuses with extended-day operations, sports facilities, ICT load and catering. Large hotels above 100 rooms with conference facilities, kitchens, laundry and HVAC driving year-round demand. Food processing and refrigerated logistics facilities where chiller load runs continuously through daylight hours, delivering exceptional self-consumption rates. These map to our coverage of large SME and industrial sectors.

Worked example: a Yorkshire refrigerated logistics facility, 7,500 sqm warehouse, 24/7 operation, three-phase 1,200 A supply, 1,400 sqm flat membrane roof, 720,000 kWh annual consumption with 65 kW continuous baseload (refrigeration plant, lighting, chargers). Quoted £172,000 plus VAT for 199.8 kW (370 x 540 Wp Trina Vertex, 4 x Sungrow SG50CX inverters, K2 ballasted east-west mounting at 10 degrees). Modelled year-one yield 184,500 kWh. Self-consumption modelled at 89% (continuous refrigeration baseload fits PV curve closely, very strong overlap), so 164,200 kWh avoid the grid at 25p/kWh blended (£41,050 saved) and 20,300 kWh export at 6p/kWh SEG (£1,218). Total year-one benefit £42,268. AIA tax relief £43,000. Simple payback 4.5 years, 25-year IRR 19.7%.

Financing a 200kW system

All three financing routes are commercially viable at 200 kW. Cash plus AIA delivers the strongest IRR for any limited company with corporation tax exposure — the £42,500 year-one tax relief shortens payback by around 18 months versus a finance route. Asset finance over 5-7 years (around £2,800-£3,400 per month over six years on £170k capex) is the route many of our 200 kW customers choose where they prefer to preserve working capital — the monthly finance payment is consistently lower than the monthly bill saving, project is cash-flow positive from month one. Hire purchase preserves AIA; an operating lease forfeits it. PPA structures are competitive at 200 kW. A 15-year fixed-rate PPA at 12-15% below current grid retail with end-of-term ownership transfer is straightforward to arrange, and PPA also handles tenancy questions cleanly because the asset never sits on the customer's balance sheet — useful for leased property, multi-tenant industrial estates, charities, schools and other organisations with limited corporation tax position. We model all three routes in your finance options assessment, and our grants and funding guide covers any sector-specific schemes that apply.

Next steps

If you want to know whether a 200 kW system makes sense for your specific business, the fastest route is a free desk-based feasibility against your half-hourly meter data — turnaround is five working days for the desk pass, plus a site survey for fixed-price proposal. Request a quote with your address. For broader cost benchmarking across system sizes see our cost guide, browse all our services, or compare adjacent sizes — step down to 150 kW or step up to 300 kW. Common questions are covered on our FAQs page. For policy detail see Ofgem's market guidance on the SEG and grid connection process, and gov.uk's AIA guidance.