What Is Energy Intensity and How Do You Measure It?

Energy intensity is a measure of how much energy your business uses relative to its output. It answers the question that total consumption figures alone cannot: are we becoming more or less efficient as the business changes size? A business that reduces its energy consumption by 10% while its output grows by 20% has improved its energy intensity significantly. A business that reduces consumption by 10% while its output falls by 15% has become less efficient in energy terms, even though the absolute bill is lower.

---

How to define and measure it

Energy intensity is expressed as energy consumed per unit of output. The choice of output metric depends on the business: manufacturing uses kWh per tonne of product or kWh per unit produced; hospitality uses kWh per guest night or kWh per cover; retail uses kWh per square metre of trading space or kWh per £1,000 of turnover; offices use kWh per full-time equivalent employee or kWh per square metre; logistics uses kWh per vehicle kilometre or kWh per tonne-kilometre.

The right metric is the one that most closely reflects the activity driving your energy consumption. In a manufacturing context, production volume is usually the right denominator. In a service business, floor area or headcount is typically more appropriate.

---

Why it matters more than absolute consumption

Absolute energy consumption figures mislead in growing or contracting businesses. A retailer that opens three new stores will show increased total consumption — which looks like an efficiency failure — while actually having improved energy intensity per square metre significantly through LED retrofit and HVAC upgrades at each site. Energy intensity normalises for scale. It allows genuine performance tracking over time, meaningful comparison between sites of different sizes, and credible benchmarking against sector peers or published industry benchmarks.

---

Setting a baseline and target

Establishing an energy intensity baseline requires two things: 12 months of energy consumption data and the corresponding output metric for the same period. Calculate the ratio. That is your baseline intensity figure. A reduction target — say, 5% improvement in energy intensity per year — gives the business a performance goal that accounts for growth. It also provides the framework to evaluate the cost-effectiveness of proposed efficiency investments: does this project improve energy intensity, and by how much per £ invested?

---

Energy intensity and reporting

SECR (Streamlined Energy and Carbon Reporting) requires qualifying large companies to report at least one intensity metric alongside their energy consumption and emissions figures. For SMEs reporting voluntarily or to supply chain requirements, including an intensity metric — and showing year-on-year improvement — demonstrates a more sophisticated and credible energy management position than raw consumption figures alone.

Telnergy uses consumption data — including intensity analysis where available — to provide context for procurement decisions. A business that understands its intensity trajectory is better placed to make the case for the contract structure and length that suits its operational direction.

📱 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