Renewable Energy Solutions for UK Businesses: What Actually Saves Money

Most UK businesses are already on a renewable energy tariff without knowing it. The question is whether it’s saving them anything.

The term “renewable energy solutions” covers an enormous range of products — from a standard electricity contract backed by Renewable Energy Guarantees of Origin (REGOs) to a ground-mounted solar array with battery storage and a Power Purchase Agreement. The distance between these two points is measured in tens of thousands of pounds of capital, years of payback calculation, and very different risk profiles. For UK SME owners, cutting through the marketing language to understand which renewable energy options are genuinely worth pursuing — and in what order — requires a framework grounded in costs, returns, and business context.

---

Option 1: Green electricity tariffs — zero capital, immediate

The most accessible renewable energy solution for any UK business is a green electricity tariff — an energy contract backed by Renewable Energy Guarantees of Origin (REGOs). The cost premium is minimal — typically 0.1–0.3p/kWh, or £100–£300 per year on a 100,000 kWh annual consumption. In many cases, competitive tendering produces REGO-backed contracts at rates indistinguishable from non-REGO equivalents, because the supplier has sourced REGOs cheaply in bulk. What it delivers: documentation of renewable electricity consumption for sustainability reporting, CBAM compliance, and Scope 2 emissions reporting under GHG Protocol market-based methods. There is no reason not to be on a REGO-backed tariff if the cost premium is negligible and the sustainability reporting benefit is real.

---

Option 2: Solar PV — onsite generation

Rooftop solar photovoltaic installation is the renewable energy solution with the clearest and most consistently positive financial return for UK commercial premises with suitable roof space. A 100 kWp commercial installation generating 85,000–95,000 kWh per year and self-consuming 75% of that generation saves approximately £15,000–£18,000 per year in grid electricity at current prices. Capital cost: approximately £70,000–£100,000 installed. Payback: 4–7 years. After payback, the system generates at minimal maintenance cost for 25+ years.

Solar Power Purchase Agreements (PPAs) allow installation at zero upfront cost — the developer installs and owns the system, the business purchases the electricity generated at a contracted rate typically 15–25% below grid rates. Best suited to businesses with south- or south-west-facing roof area of 200m²+, high daytime electricity consumption, and long-term occupation of the premises.

---

Option 3: Corporate Power Purchase Agreements — off-site renewable generation

A corporate PPA connects your business directly to a specific renewable generation asset — a wind farm, solar park, or hydroelectric facility — through a long-term supply contract. Corporate PPAs are primarily accessible to businesses consuming 1,000 MWh per year or more. For eligible businesses, they offer price certainty over a longer horizon than standard fixed contracts, direct renewable provenance, and alignment with Scope 2 market-based emissions reporting requirements.

---

Option 4: Heat pumps — decarbonising heat

For businesses with significant gas heating loads, air source or ground source heat pumps represent a pathway from fossil fuel heat to renewable-compatible electricity-based heat. At current UK rates (gas approximately 7p/kWh, electricity approximately 25p/kWh), a heat pump needs to achieve a seasonal COP of 3.6 to break even on running costs against gas. Modern air source heat pumps achieve 2.5–3.5 in UK commercial applications; ground source heat pumps achieve 3.5–4.5. The case is strong for ground source in the right premises. Right premises, right specification, right distribution system — a strong case. Wrong premises or incomplete specification — likely disappointment.

---

The correct sequence

The most common mistake is jumping to capital-intensive solutions before completing the zero-cost steps. A business that installs a £100,000 solar system while still on an uncompetitive energy contract — paying 20% above market rates — is saving £15,000 per year on solar while leaving £12,000 per year on the table in procurement overpayment.

The correct sequence: (1) confirm you’re on a REGO-backed tariff — zero cost, immediate benefit; (2) assess solar viability — if you have suitable roof space and daytime consumption, this is the highest-return renewable investment available; (3) review heating strategy — heat pumps are worth a properly conducted assessment if building fabric is suitable; (4) consider battery storage — only after solar is in place or as part of a grid connection strategy; (5) evaluate corporate PPA — if you’re consuming 1,000 MWh+ and have long-term price certainty requirements.

Telnergy advises on both energy procurement and renewable energy solutions — and we’re independent of solar installers, heat pump companies, and battery storage vendors. Our interest is in which combination of solutions produces the best outcome for your business.

📱 WhatsApp: 07360 272168 | 📧 hello@telnergy.com | 📞 01202 028888 Telnergy Limited · Independent commercial energy consultancy since 2002 · Ofgem registered TPI · ADR Ref E3561 · CRN 04576876 · Christchurch, Dorset