Solar Panels for Data Centres — Frequently Asked Questions
Plain answers to the questions data centre operators ask most. Last updated for 2026.
These are the questions that heads of facilities, sustainability leads, and critical environment directors actually ask when they're evaluating on-site solar for a UK data centre. Not the generic residential questions recycled by most solar websites — the specific questions that matter when your building draws 500 kW of IT load 24/7, your tenants have SBTi-aligned Scope 2 targets, and any installation downtime needs to be signed off by an uptime committee.
We've organised them by theme: costs and payback first, then technical and operational questions (Tier III/IV continuity, G99, battery storage), then sustainability and compliance (Scope 2 accounting, REGO issuance, CDP/RE100 evidence). At the end you'll find questions about finance, security clearance, and what an installer's handover pack should contain.
If your question isn't covered, send it to us directly. For a specific facility, use the quote request form and matched installers will respond.
How much do solar panels for a data centre cost in the UK?
Hyperscale and large colo (1–5 MW): £700k–£8m+. Mid-colo (300 kW–3 MW): £210k–£2.4m. Edge (50–300 kW): £45k–£270k. Cost per kW typically £700–£900 above 1 MW, £750–£950 for 300 kW–1 MW range. Capital allowances cover 75–85% of effective net cost.
What percentage of our data centre load can solar realistically supply?
Rooftop alone typically 5–15% of total annual load. Combined with adjacent ground-mount on owned land (where available), 10–25% achievable. The remaining 75–95% is typically supplied via corporate PPA, on-site CHP (where applicable), or grid imports under a green tariff. Most major UK operators run a portfolio approach.
How do we install without affecting Tier III/IV operational continuity?
Roof installation happens above the white space with zero impact on operations. Final grid connection is designed to integrate with your existing dual-path infrastructure — primary feed continuity maintained throughout.
Will solar satisfy our customer SLAs that reference renewable energy?
Yes — and it's typically the strongest evidence available. Microsoft, Google, AWS, Meta, Apple all explicitly prefer bundled/on-site renewables over unbundled REGOs. A good installer provides an audit-ready evidence pack including PVSyst yield model, MCS certification, generation reports, and Scope 2 calculation methodology.
What about combining solar with battery storage?
Increasingly common at data centre scale. Battery storage provides: (1) grid services revenue (Dynamic Containment, Capacity Market), (2) peak shaving for DUoS triad management, (3) backup capacity reducing UPS cycling, (4) PPA-style supply smoothing. Typical sizing: 1–4 MWh battery alongside 1–3 MW PV.
What about the embodied carbon of the panels — does the lifetime maths really work for us?
Yes, decisively. Modern crystalline silicon panels have an energy payback period of 1–2 years in UK conditions. A 2 MW data centre PV install displaces 25–40 times its embodied carbon over a 25-year life. IEA PVPS Task 12 lifecycle assessments are the authoritative source — a good installer shares these in the audit pack.
How does this fit with our SBTi / CDP / TCFD reporting?
Directly — on-site PV generates auditable Scope 2 reduction. SBTi (Science Based Targets initiative) explicitly favours on-site renewables in their target validation. CDP A-list scoring rewards on-site supply over unbundled REGOs. TCFD physical and transition risk disclosures benefit. A good installer provides the methodological evidence pack.
What about data sovereignty / security during install?
Fully accommodated. Installation crews are normally required to meet the operator's security clearance (typically including BPSS, sometimes higher), with an NDA between the installer, the operator and any tenant whose customer data sits at the site. CCTV and access control protocols followed throughout.
Do we need planning permission?
Most data centre sites are on industrial-zoned land where rooftop PV is permitted development under Class J Part 14 GPDO 2015. Ground-mount on adjacent land typically needs planning permission. A good installer confirms planning status as part of the feasibility study.
How long does the install take?
From contract to commissioning: 9–18 months. Physical install: 8–24 weeks for 1–5 MW systems. Commissioning and integration with existing infrastructure: 4–8 weeks. Customer audit alignment can extend pre-contract phase. DNO connection rarely the binding constraint for data centres (existing capacity usually sufficient).
What about edge sites and unmanned facilities?
Increasingly common solar candidates. Smaller scale (50–300 kW), unmanned, often standardised builds. A good installer delivers these as repeatable rollouts with single design, multi-site deployment. Remote monitoring and emergency response protocols agreed upfront.
Can we structure as a PPA on our own roof?
Yes — third-party-owned rooftop PV with operator as offtaker is now standard. Zero capex, locked-in below-grid kWh pricing for 15–20 years, off-balance-sheet treatment, transferable in M&A scenarios. Several major UK colo operators have used this structure.