Restaurant Kitchen Energy: The True Cost of Your Commercial Range

A Commercial Restaurant Range Burns Gas Whether You’re Cooking or Not. On a Typical Service Day, 30–40% of Kitchen Gas Consumption Happens Between Covers.

The commercial kitchen is the most energy-intensive square footage in any restaurant operation. A professional range running at full heat during a busy dinner service is one of the highest-intensity gas consumers in commercial premises. But the economics of restaurant kitchen energy are less about peak consumption and more about the cumulative cost of equipment that idles, pilots that burn, and extraction systems that run because the health and safety specification requires them to — regardless of whether anyone is cooking.

For a UK independent restaurant or gastro-pub spending £25,000–£60,000 per year on energy, the kitchen accounts for 50–70% of total gas costs and 25–40% of total electricity costs. Understanding where that energy goes — and where it can reasonably be reduced without affecting food quality or service capability — is a prerequisite for making sound energy procurement decisions.

The Commercial Range: Understanding the True Running Cost

A 6-burner commercial range with a built-in oven section is typically rated at 25–35 kW of gas input capacity across the hob burners, with the oven section adding a further 8–15 kW. A fully utilised 35 kW range running for 4 hours of active service consumes 140 kWh of gas per service. At current contracted gas rates of around 6–9p/kWh for commercial premises, that’s £8.40–£12.60 per service, or £4,400–£6,600 per year for a restaurant running 7 dinner services per week.

That’s the active service consumption. The problem is the rest of the operating day.

Most commercial kitchens light their ranges 1–2 hours before service to reach temperature, and don’t extinguish them until cleaning is complete — typically 30–60 minutes after last covers. A kitchen that operates dinner service from 6pm–10pm is likely running gas equipment from 4pm–11pm — a 7-hour window for 4 hours of active cooking. The pre-heat and post-service periods consume gas at idle rates — typically 30–50% of full operating consumption — for 3 hours per service day.

For a restaurant running 7 services per week, 50 weeks per year: 350 service days, 1,050 idle hours at 30–50% range capacity = 350,000–583,000 kWh of idle gas consumption per year. At commercial gas rates, that’s £21,000–£52,500 per year in gas consumed while not actively cooking.

This is not a fabricated figure. It represents the structural inefficiency of commercial kitchen equipment that is designed to maintain readiness rather than minimise consumption.

Extraction: The Electricity That Runs Regardless

Commercial kitchen extraction systems — canopy extract and supply air handling units — are specified to maintain fire safety ventilation rates as well as heat and vapour removal. The ventilation rates required by current Part F building regulations and kitchen extraction standards are significant: a typical medium-sized restaurant kitchen requires 4,000–8,000 cubic metres per hour of extract airflow.

The fan motors driving this airflow consume continuous electricity. A kitchen extract fan running at 5,500 m³/hr on a centrifugal fan motor typically draws 2.5–4 kW continuously. Running 12 hours per day, 350 days per year: 10,500–16,800 kWh per year — just on extract ventilation. A supply air handling unit adds similar or greater consumption.

Variable speed drives (VSDs) on extract fans allow the airflow rate to be modulated based on actual cooking activity — reducing to minimum ventilation rates during pre-heat, inter-service, and cleaning periods when full extraction is unnecessary. VSDs on kitchen extraction typically reduce ventilation electricity consumption by 30–50% with a capital cost of £1,500–£5,000 per fan installation. The payback period at current electricity prices is typically 12–24 months.

Refrigeration in a Restaurant Kitchen

Every restaurant kitchen operates multiple refrigeration assets: under-counter refrigerators at each station, upright fridges for prep ingredients, blast chiller for rapid food safety cooling, possibly a walk-in cold room for high-volume storage. As in food retail (covered separately), all of these run continuously.

The critical point for restaurants is that kitchen refrigeration occupies a warm, often poorly ventilated environment — particularly under-counter units near ranges or fryers. Refrigeration equipment working in ambient temperatures of 28–35°C (common in an active kitchen) works significantly harder than the same equipment in a 20°C ambient. Equipment life is shorter, maintenance frequency is higher, and electricity consumption per hour of operation is elevated.

Kitchen refrigeration positioning — ensuring adequate ventilation clearance around condenser coils, positioning cold storage away from direct heat sources where possible — is an operational hygiene point that directly affects energy consumption and equipment longevity.

The Fryer and the True Cost of Frying

Deep fryers are among the highest-intensity point gas consumers in a restaurant kitchen. A single commercial 15-litre fryer rated at 20–25 kW, running through a busy 4-hour service, consumes 80–100 kWh of gas — approximately £5–9 per service. A fish and chip restaurant or a pub kitchen with three or four fryers running simultaneously during peak service is consuming 240–400 kWh of gas per service session in frying alone.

Oil management directly affects fryer energy consumption. Degraded oil requires higher operating temperatures to achieve the same frying result, increasing both gas consumption and oil turnover costs. Regular oil filtration and systematic oil change programmes are operationally standard but are rarely discussed in the context of energy management — the energy efficiency argument for good oil management is as strong as the food quality argument.

Gas Contract Strategy for Restaurants

Restaurant gas consumption has three specific characteristics that should inform contract decisions:

Seasonal variation: Restaurants typically see higher gas consumption in winter — not because they cook more, but because the building heating load increases and kitchen equipment works harder in colder ambient conditions. Gas contracts for restaurants should account for this seasonal pattern rather than pricing against an annual average that doesn’t reflect the winter/summer split.

Operational variability: Restaurants that close for a week in January or expand for a Christmas events season have consumption patterns that standard contract models may not accommodate well. If your restaurant has significant closure or peak periods, discuss this with your broker — some contract structures handle consumption variability more graciously than others.

Dual fuel reality: Most restaurant operators are managing both a significant gas contract (kitchen and heating) and an electricity contract (refrigeration, extraction, EPOS, lighting). These contracts should ideally be managed in coordination — same renewal window, same adviser, comparative assessment of both fuel costs against the market simultaneously.

What Telnergy Covers in a Restaurant Energy Review

We review restaurant and hospitality energy contracts as a core service area — not as a specialist niche. The conversation covers dual-fuel procurement, VAT and CCL position (restaurant sector: standard 20% VAT, standard CCL unless the business has a CCA), consumption profile against seasonal trading patterns, and — for operators who want to go deeper — kitchen energy efficiency interventions with clear ROI calculations.

If your restaurant is paying for gas on a contract that was last reviewed more than 12 months ago, the saving from a current market comparison is likely immediate and measurable.

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Telnergy Limited • Independent Energy Consultants since 2002 • Ofgem TPI Registered • Christchurch, Dorset