Net Zero roadmap for UK businesses — where solar fits
A credible Net Zero plan is measurable, sequenced and financially rational. Here's the six-step roadmap most UK mid-market businesses follow, and where on-site solar sits in the priority order.
The six-step roadmap
1. Measure and baseline (Month 0–3)
GHG Protocol inventory of Scope 1 (gas, fleet), Scope 2 (electricity) and material Scope 3. Half-hourly electricity data pulled from your MOP. This becomes the fixed baseline against which SBTi and B Corp targets are set.
2. Set a science-based target (Month 3–6)
SBTi Near-Term (2030) and Net Zero (2050) targets are now table stakes for supply-chain contracts with Unilever, Tesco, NHS and MOD. Aim for 50–65% Scope 1+2 reduction by 2030.
3. On-site solar first (Year 1)
Rooftop or ground-mount solar is almost always the highest-IRR carbon-reduction lever available. Typical payback 5–8 years, cuts Scope 2 by 30–60%.
4. Electrify heat and fleet (Year 1–4)
Air-source or ground-source heat pumps for space and hot water. EV chargers for vans and pool cars, powered by daytime solar. This is where Scope 1 gets cut.
5. Battery storage and REGO-backed PPAs (Year 2–5)
Fill remaining Scope 2 with a corporate PPA backed by REGO certificates from new-build UK solar/wind. Batteries shift solar into evening peak.
6. Address Scope 3 (Year 3+)
Supplier engagement, logistics fuel switch, embodied carbon in materials. The hardest bucket — but with your own house in order, you have credibility to demand it from suppliers.
Why solar comes first
Solar is the only major decarbonisation lever that pays for itself in single-digit years. Sequencing it before heat and fleet electrification means the energy your heat pumps and EVs will draw is largely coming from your own roof — dropping your Scope 1 and 2 in one integrated move.
FAQ
How does solar fit into a Net Zero plan?
Solar is the highest-return single carbon lever available to most UK businesses — a 200 kWp rooftop system typically cuts 45 tCO2e/yr while saving £40k+. It should be the first capex commitment in any credible plan.
SBTi vs Net Zero UK — what's the difference?
The Science Based Targets initiative (SBTi) is the international gold standard for corporate targets. Net Zero UK is the government's 2050 statutory target. SBTi-validated targets are what suppliers and customers increasingly demand.
Can a business be Net Zero on solar alone?
Almost never — solar typically handles 30–60% of Scope 2. Heat pumps, EV fleet electrification, high-quality PPAs and finally REGO-backed grid supply close the rest. Offsets are last resort.
How much does a Net Zero roadmap cost?
The plan itself: £5k–£30k depending on complexity. Implementation is where the numbers scale — but the vast majority of Year 1–3 spend has a positive NPV thanks to energy savings.
Do we need to buy carbon offsets?
Only for residual emissions after all cost-effective reductions. SBTi requires ~90% real reduction before offsets — 'net' means net after everything else.
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