Energy Efficiency Investment Payback 2025/26
Calculate the payback period and ROI for energy efficiency investments in your UK business in 2025/26. Model LED lighting upgrades, insulation, HVAC improvements and smart metering — with current energy prices making paybacks shorter than ever.
Key Inputs
- Current annual energy bill (£) — electricity and gas separately
- Building area (m²) and type: office, warehouse, retail, industrial
- Measures to model: LED lighting retrofit, loft/wall insulation, HVAC upgrade, smart metering
- Installation cost per measure (£) — quotes from contractors
- Current energy prices: electricity (p/kWh) and gas (p/kWh)
What You'll Get
- Annual energy saving (kWh and £) per measure
- Simple payback period (years) per measure
- Net Present Value (NPV) over 10 years at 8% discount rate
- CO2 reduction per measure (tCO2e/year)
- Prioritised investment plan: best ROI measures first
Important Notes — 2025/26 Rates & Caveats
UK energy efficiency benchmarks 2025: LED lighting retrofit typically saves 50-70% of lighting energy — payback 1-3 years. Roof insulation for warehouses: 15-25% space heating saving — payback 2-5 years. HVAC upgrade (air source heat pump vs gas boiler): dependent on gas vs electricity price ratio — currently less favourable as electricity remains ~4x gas price/kWh. Smart metering: reduces energy use by 5-15% through behavioural change and leak/fault detection — payback typically under 12 months. Climate Change Agreements (CCAs) give eligible energy-intensive sectors up to 92% discount on Climate Change Levy — worth investigating before investing.
Frequently Asked Questions
What energy efficiency measures give the best payback for UK businesses?
LED lighting retrofits consistently give the best payback — typically 1-3 years — and reduce lighting energy use by 50-70%. Smart metering and energy monitoring pays back within 12 months through leak/fault detection and behavioural change (5-15% savings). HVAC optimisation (controls, zoning, scheduling) can save 20-30% of HVAC energy with minimal capital cost. Building fabric improvements (insulation, glazing) have longer paybacks of 5-10 years but are often fundable through green finance or PACE loans.
Is there government funding for business energy efficiency?
Yes — the UK Industrial Energy Transformation Fund (IETF) offers grants of £100,000 to £30 million for energy-intensive manufacturers investing in low-carbon heat and energy efficiency. The Business Energy Advice Team offers free advice. The Green Business Fund (Carbon Trust) closed in 2023 but similar programmes exist regionally. Climate Change Agreements give eligible sectors up to 92% discount on the Climate Change Levy, making investment in qualifying equipment more attractive.
What is the Climate Change Levy and how does it affect energy efficiency ROI?
The Climate Change Levy (CCL) is a tax on business energy use charged on electricity (0.775p/kWh in 2024/25) and gas (0.672p/kWh). Businesses in Climate Change Agreements pay only 8% of the levy rate in exchange for meeting energy efficiency targets. CCL rates increase the effective cost of energy for businesses, which improves the payback of energy efficiency investments — every kWh saved avoids both the energy cost and the CCL.
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