How much do solar panels for data centres cost?

What does data centre solar PV actually cost in the UK?

The direct answer: a rooftop solar PV installation on a UK data centre building costs between £700 and £1,250 per kilowatt of installed capacity, all-in, for a system delivered to MCS commercial standards with Tier III/IV operational continuity throughout installation. For the most common data centre system sizes — 250 kW to 2 MW — that translates to a total project cost of £175,000 to £2.5 million. The wide range is driven by roof type, access difficulty, electrical infrastructure available, DNO connection process, and the specific continuity design required for your facility tier.

This guide gives you real UK pricing benchmarks for 2026, broken down by data centre sub-type, and explains the factors that drive variation. We do not give you a single number because the honest answer is that a hyperscale campus in Slough and an enterprise data room in Nottingham have very different cost profiles. Use this guide to form a realistic budget before commissioning a formal feasibility study — and to sense-check any quotes you receive.

Cost per kW by system size

Data centre solar costs follow the same economies of scale as all commercial solar:

All figures are ex-VAT, all-in (design, equipment, labour, scaffold/MEWP, G98/G99 DNO connection, commissioning, Scope 2 evidence pack). Updated for 2026 pricing. Regional contractor costs vary by up to ±10%.

What drives cost variation in data centre solar?

Two identical-capacity systems on two different data centre buildings can have costs varying by 30–40%. The main drivers:

1. Roof type and condition

Modern flat EDPM or profiled steel roofing (post-2005 construction) is the cheapest to work with: ballasted or mechanically fixed racking, no special weatherproofing requirements, and good structural loading capacity. Older data centres — particularly converted industrial buildings from the 1980s–90s — may have asbestos cement sheeting (ACM) that cannot carry PV directly and requires a combined re-roof programme. An ACM re-roof adds £30–£80/m² to the project cost, but the PV business case often covers most or all of this additional outlay within the payback period.

2. Electrical infrastructure

Most data centres have primary 11 kV or 33 kV supplies with modern secondary LV switchgear. The inverter connection point — typically a dedicated incomer to the LV main distribution board — needs assessment for available bus capacity. Some facilities have modular or pre-manufactured switchgear that requires factory-modified busbars; others have abundant spare incomer positions. The difference in electrical installation cost between a simple connection and a complex switchboard modification can be £15,000–£60,000 on a large system.

3. Tier III/IV continuity design overhead

Installing solar on a live Tier III or Tier IV data centre requires phased installation sequences, UPS transfer testing at each phase, anti-islanding relay specification and commissioning, and additional project management overhead compared to a simple commercial install. This adds approximately 8–15% to the labour and design cost versus an equivalent-capacity installation on a non-critical commercial building. It is non-negotiable — it is the cost of doing the installation correctly on mission-critical infrastructure.

4. Access difficulty

Rooftop access on data centre buildings is often more complex than on standard commercial or industrial roofs. Security perimeters require personnel vetting and escorted access. Cooling plant — CRAC units, cooling towers, chillers — occupies significant roof area and restricts working zones. Height, parapet design, and MEWP access (mobile elevated work platform) requirements vary by building. Access overhead typically adds £8,000–£25,000 to a large data centre install compared to an open industrial roof.

5. DNO grid connection

Solar PV for data centres is invariably designed as a zero-export, fully self-consumed system. This means the DNO does not need to assess reverse power flow on the local distribution network — the solar generation is completely absorbed into the building's IT load. For systems below 50 kW, G98 self-certification applies (no DNO charge). For systems 50 kW–1 MW, a G99 application is required. The DNO technical study and connection agreement cost between £500 and £8,000 depending on the DNO and the complexity of the technical study. We submit G99 applications immediately after the site survey to start the clock, since the connection process is usually the longest item in the project timeline (65 working days statutory minimum for the technical study).

6. Location

Contractor labour costs vary by approximately ±10% across the UK. London and the South East are typically at the top of the range; the Midlands and Wales are at the lower end. For data centre solar in Slough or London Docklands, you should budget at the upper end of the cost-per-kW ranges above. For facilities in Manchester, Birmingham, or Cardiff, expect to come in at the lower end or below mid-range.

Financing options — how most data centre operators fund solar

Over half of data centre solar installations in the UK are funded through one of three mechanisms. Understanding the true cost depends on which structure you use:

Cash purchase (Full Expensing)

For UK limited companies paying corporation tax at 25%, the Full Expensing regime (permanent from November 2023) allows 100% of the capital cost to be deducted from taxable profits in year one. On a £500,000 installation, this is a £125,000 tax saving — reducing the effective net cost to £375,000. At that net cost, against £100,000/year electricity savings, payback falls to 3.75 years rather than 5 years. Cash purchase with Full Expensing delivers the highest IRR of any financing structure (typically 20–25%) and is the right choice for companies with available capital and a meaningful tax liability.

Asset finance (hire purchase or finance lease)

Asset finance spreads the capital cost over 5–10 years. For a well-structured transaction on a data centre system, monthly repayments will typically be below monthly electricity savings from day one — making the investment EBITDA-positive from commissioning. A 7-year HP agreement on a £500,000 system at 6.5% APR produces monthly repayments of approximately £7,300, against electricity savings of £8,300+/month. The net monthly benefit is positive from month one. Interest on the HP agreement is tax-deductible, and the asset is on-balance-sheet for Full Expensing purposes. We introduce operators to specialist green asset finance lenders with experience in data centre solar.

Power Purchase Agreement (PPA)

A PPA involves zero capital outlay. A third-party funder (the PPA provider) owns, installs, insures, and maintains the solar system. You agree to purchase the generated electricity at a below-market rate — typically 60–75% of your current grid retail price — for a contract period of 15–25 years. At the end of the contract, you can purchase the system at a pre-agreed depreciated price, or the contract can be extended.

PPAs have lower IRR than cash purchase (the PPA provider captures most of the long-term value), but require zero capital commitment and transfer all technical risk to the funder. For data centre operators who prioritise balance sheet efficiency over long-term yield, PPAs are an attractive route. Electron Green, Shawton Energy, and several other providers offer PPA-funded data centre solar. We can introduce you to suitable PPA originators.

See our grants and funding page for detail on how the Annual Investment Allowance, Industrial Energy Transformation Fund (IETF), and other national schemes interact with these financing structures.

Payback benchmarks — real UK data centre solar projects (2023–2025)

Based on projects we have delivered and feasibility studies we have completed for UK data centres over the past two years, here are representative payback benchmarks:

Payback figures assume 100% self-consumption (typical for 24/7 IT load), 22–26p/kWh blended grid rate, no export income. Net cost after Full Expensing tax relief not applied (apply a 25% reduction to payback years for corporation tax payers using Full Expensing).