Most offices treat the energy bill as a fixed cost you pay and forget. It is not fixed. Two identical 50-person offices can differ by €20,000 a year on electricity alone — before anyone touches a light switch. And of the bill you do pay, a third to a half is addressable with measures that pay back in under two years.
This playbook covers three things, in the order that makes financial sense: what you actually pay, where every kilowatt-hour goes, and the three levers — tariff, behaviour, equipment — with the measured savings and payback periods for each.
The math throughout is conservative: a 50-person office consuming 120 MWh of electricity per year (roughly 2.4 MWh per person, a typical mid-range European office figure), at Eurostat’s official H1 2026 business prices.
What a 50-person office actually pays
Eurostat publishes business electricity prices twice a year for the “non-household” band of 500–2,000 MWh per year, excluding VAT and recoverable taxes — the level most SMEs effectively pay. The H1 2026 round (January–June) puts the EU average at €0.1800 per kWh.
Run 120 MWh through the country spread and the gap is brutal:
| Country | €/kWh (H1 2026) | Annual bill for 120 MWh |
|---|---|---|
| Finland | 0.0928 | €11,136 |
| Sweden | 0.1177 | €14,124 |
| Portugal | 0.1273 | €15,276 |
| Spain | 0.1336 | €16,032 |
| France | 0.1567 | €18,804 |
| EU average | 0.1800 | €21,600 |
| Germany | 0.2058 | €24,696 |
| Poland | 0.2070 | €24,840 |
| Italy | 0.2253 | €27,036 |
| Cyprus | 0.2306 | €27,672 |
| Ireland | 0.2666 | €31,992 |
Same load, same people: the Dublin office pays €20,856 more per year than the Helsinki office — €417 per employee, every year, permanently. That gap is structural (generation mix, grid fees, levies), and no amount of switching off monitors closes it.
Two more numbers worth knowing. First, prices are easing but not normalised: the EU business average fell from its H1 2023 peak of €0.2151/kWh to €0.1800, and the ex-tax component (€0.1466/kWh) is the lowest since early 2022. Second, if your office also heats with gas, Eurostat’s H1 2026 non-household gas average is €0.06/kWh — for many European offices that adds another €15,000–30,000 a year on top of the electricity table above.
The rest of this article assumes the EU-average office: €21,600 a year in electricity, and shows what each lever realistically takes out of it.
Where the kWh actually go
You cannot cut what you cannot locate. The most-cited end-use breakdown for a typical air-conditioned office building comes from the Australian Clean Energy Council’s office energy factsheet (still the reference used by most facility guides):
| End use | Share of office electricity | 120 MWh office | Annual cost at €0.18/kWh |
|---|---|---|---|
| Heating, ventilation, air conditioning (HVAC) | 39% | 46.8 MWh | €8,424 |
| Lighting | 25% | 30 MWh | €5,400 |
| Office equipment (IT, screens, kitchen) | 22% | 26.4 MWh | €4,752 |
| Lifts | 4% | 4.8 MWh | €864 |
| Domestic hot water | 1% | 1.2 MWh | €216 |
| Other | 9% | 10.8 MWh | €1,944 |
Three adjustments for a 50-person SME office:
- Without air conditioning, heating dominates. Carbon Trust’s office benchmark puts heating alone at 20–40% of office energy costs in non-cooled buildings — in a northern European office, heating is the single biggest line, not HVAC overall.
- IT share is rising. Equipment was measured at 22% in the classic breakdown; with laptop docks, monitors and small servers, treat 22–30% as the modern range. Roughly 10% of office electricity goes to devices that are “off” but not unplugged — the standby phantom load documented by Lawrence Berkeley National Laboratory’s standby power project.
- Lighting at 25% assumes nobody optimises. It is the most evenly distributed and most wasteful category: lights in unoccupied rooms, over-bright corridors, fluorescent tubes past their efficient life.
The practical takeaway: HVAC and lighting together are about 64% of the bill, and both respond to controls and behaviour within weeks. IT responds more slowly, through procurement.
Lever 1: the tariff (weeks 1–4, no capex)
The tariff lever changes what you pay per kWh without changing a single kWh you use. It is the cheapest money in energy.
Contract renegotiation. Business electricity contracts are rarely shopped. With wholesale prices down roughly 20% from the 2022 peak and the ex-tax EU average at its lowest since early 2022, an office still on a contract signed in 2023–2024 is overpaying. Collect 12 months of interval data, put it out to three or four suppliers, and negotiate. Realistic outcome for a 120 MWh office: 5–15% off the unit price — €1,100–3,200 a year. Cost: a few hours of your time, or 5–10% of the saving to a broker. Payback: immediate.
Dynamic and half-hourly tariffs. Time-of-use pricing pays you for shifting load into cheap hours. The peer-reviewed Brunel/Manchester analysis of non-domestic consumers found tariff switching is one of the few levers available to tenant businesses, with the largest benefits for loads that can actually move. Realistic range for an office: 3–10%, only if you shift dishwashers, EV charging and any battery or thermal storage into off-peak windows. If your load is flat 9-to-6, take the low end or skip it.
Guarantees of origin (GOs). Renewable attribute certificates for European wind and hydro have traded in the range of roughly €2–10 per MWh in recent years. Covering all 120 MWh adds €240–1,200 a year — a rounding error against the bill, and the cheapest credible decarbonisation claim available. Buy them bundled with a supply contract, not as a separate product with a dealer markup.
Honest ceiling for the tariff lever: €1,500–4,000 a year on a €21,600 bill. Take it first because it costs nothing, but it will not transform your P&L.
Lever 2: behaviour and controls (weeks 2–8, low capex)
These are the measures with actual measured savings behind them, not vibes.
Thermostat discipline. The US Department of Energy’s long-standing rule of thumb is roughly 3% of heating/cooling energy per 1°C of setpoint adjustment. A controlled simulation study from the University of Sydney’s Better Buildings program found raising a cooling setpoint from 22.2°C to 25°C cut cooling energy by an average of 29% without reducing occupant satisfaction. Take the conservative DOE number: on a €8,400 HVAC line, a 1–2°C winter setback at night and at weekends is worth €250–500 a year per degree of sustained adjustment, more with a proper schedule.
Smart thermostats and zoning. Programmable and smart controls automate the setback that humans forget. They pay for themselves in the first heating season in most small offices: a zone-capable smart thermostat system for a 50-person office costs €800–2,500 installed and typically returns 10–15% of heating energy — €800–1,300 a year in a heating-dominated office. Payback: under two years.
Standby elimination. LBNL’s standby power research puts devices in off/standby modes at 5–10% of electricity use in commercial buildings — call it 6–8 MWh and €1,100–1,400 a year for our office. The fix costs almost nothing: smart power strips for desk clusters (€15–30 each, say €400 for the floor), switched sockets for kitchen and meeting rooms, and a shutdown default on monitors and printers. Conservative realised saving after the easy-to-miss devices: €600–1,000 a year.
Lighting controls. Two measured effects. Carbon Trust found a basic lighting maintenance programme (cleaning lamps, timely replacement — light levels fall up to 30% in 2–3 years without it) cuts lighting costs by up to 15%. PNNL’s field study of occupancy sensors in LED installations confirmed large reductions in areas with intermittent occupancy; the widely used planning figure is 20–40% of lighting energy in meeting rooms, corridors and toilets, less in open-plan areas with constant presence. On a €5,400 lighting line: €500–1,100 a year for €50–120 per sensor zone installed. Payback: 6–18 months in low-occupancy zones.
Realistic combined ceiling for behaviour and controls: €1,800–3,500 a year — roughly 10–16% of the bill — for well under €5,000 of capex.
Lever 3: equipment (months 2–12, real capex)
Equipment is where the remaining structural waste lives, and where payback discipline matters most.
Lighting retrofit (if still fluorescent). LED tubes and panels cut lighting wattage by 50–70% against legacy fluorescent. A 50-person office retrofit costs €3,000–8,000 and saves €2,700–3,800 a year on a €5,400 lighting line. Payback: 1–2.5 years. If you are already LED, skip this — the remaining win is controls, not fixtures.
Displays and computers. Monitors are the most numerous always-on device. Buying to the EU energy label’s top classes (an A-rated 27-inch monitor draws roughly half of a decade-old one) is a procurement rule, not a project: it costs nothing incremental at purchase time and saves €5–10 per screen per year. Replacing 50 aging monitors with A-class models costs €6,000–12,000 and saves €400–700 a year — payback 8–15 years, so do it on refresh cycle, not as an energy project. The exception is fleet laptops vs desktops: a modern laptop docked draws a fraction of a desktop tower, and refresh-to-laptop pays back fastest of any IT move.
Heat pump water heating and HVAC upgrades. An air-source heat pump replacing electric or resistive heating cuts the same heat for roughly a third of the electricity (COP ~3). For a 120 MWh office with a large electric heating share, this is the biggest single cut available — €2,500–4,500 a year — but capex is €8,000–25,000, so payback is 3–7 years before any national subsidy. Check your country’s grant scheme before ruling it out; several EU states cover 30–50%.
Metering first. Before any equipment spend, sub-meter or at least interval-log the big loads. A basic submetering setup for a small office is €500–1,500 and routinely surfaces 5–10% of waste you did not have a name for. It is the highest return-per-euro item in this section and it de-risks everything after it.
The 90-day action plan
Assumptions: 50-person office, 120 MWh/year, €21,600 electricity bill at the EU average price. Savings are conservative realised ranges, not lab maxima.
| Week | Action | Cost | Expected annual saving |
|---|---|---|---|
| 1 | Pull 12 months of consumption data; check current contract end date | €0 | — |
| 2 | Shop the contract: quotes from 3–4 suppliers, renegotiate | €0 | €1,100–3,200 |
| 2 | Set heating setback schedule (−2°C nights/weekends), cooling +1°C | €0 | €250–500 |
| 3 | Add GOs to the new supply contract (120 MWh) | €240–1,200 | (decarbonisation, not cost) |
| 3–4 | Smart power strips on desk clusters; switched sockets in kitchen/meeting rooms | €300–600 | €600–1,000 |
| 4–6 | Install smart/zoned thermostats | €800–2,500 | €800–1,300 |
| 5–7 | Occupancy sensors in meeting rooms, corridors, toilets | €600–1,500 | €500–1,100 |
| 6–8 | Lighting maintenance pass: clean fittings, replace dim tubes | €200–400 | €400–800 |
| 8–10 | Sub-meter main loads (HVAC, kitchen, server area) | €500–1,500 | unlocks 5–10% future cuts |
| 10–12 | Fluorescent→LED retrofit (only if still fluorescent) | €3,000–8,000 | €2,700–3,800 |
| 12–13 | Procurement rule: top energy-class only on refresh; laptop-over-desktop default | €0 | €200–500 (ramping) |
| 13 | Review: metered baseline vs actual; set next year’s target | €0 | — |
Stacked conservatively (excluding the LED retrofit, which is conditional): €3,850–8,400 a year, 18–39% of the bill, for €2,400–6,500 of first-year capex plus €240–1,200 of GOs. Add the retrofit and the first-year total capex is €5,400–14,500 against €6,550–12,200 of annual savings. Every measure in the table has a payback under 3 Jahre, and most under 18 months.
FAQ
How much electricity does a 50-person office really use? Typically 100–150 MWh per year in Europe, depending on climate, HVAC type and hours. 120 MWh is a fair planning figure: 2.4 MWh per person. At the Eurostat H1 2026 EU business average of €0.18/kWh, that is €21,600 a year — but only €11,136 in Finland and €31,992 in Ireland for identical consumption.
Is switching supplier worth the hassle for a small office? Yes, and it is the first thing to do. Wholesale-driven retail prices fell through 2025 and into 2026, so contracts signed at 2022–2023 prices are stale. A single competitive tender typically removes 5–15% of the unit price with zero operational change. If your contract auto-renews, you are almost certainly overpaying.
Do occupancy sensors and smart thermostats actually pay back? In low-occupancy zones, yes: measured lighting-control savings of 20–40% in meeting rooms and corridors against sensor costs of €50–120 per zone give paybacks of 6–18 months. Thermostats follow the ~3% per degree rule (US DOE); zoned smart controls typically return 10–15% of heating energy, paying back within two heating seasons in most climates.
What share of office energy is just wasted on standby? Standby power research from Lawrence Berkeley National Laboratory puts devices in off/idle modes at 5–10% of commercial building electricity. For a 120 MWh office that is up to €1,400 a year, and most of it is killable with €400 of smart strips and a shutdown default — the best euro-for-euro saving on this page.
Should we buy green electricity with guarantees of origin? If the goal is a credible renewable claim, yes: European GOs cost roughly €2–10 per MWh, so full coverage of an office is €240–1,200 a year. Just do not confuse it with cost reduction — a GO does not lower a single euro of your bill. Cut with tariff, behaviour and equipment first; buy GOs with the savings.
Sources
- Eurostat, Electricity price statistics (H1 2026: EU non-household average €0.1800/kWh; Ireland €0.2666; Finland €0.0928; Sweden €0.1177; ex-tax €0.1466; peak €0.2151 H1 2023; datasets nrg_pc_204 / nrg_pc_205) — https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Electricity_price_statistics
- Eurostat news release, Household electricity prices ease in 1st half of 2026 (EU household average €0.28/kWh; taxes 28.4% of final bill) — https://ec.europa.eu/eurostat/web/products-eurostat-news/w/ddn-20261030-2
- Eurostat via WAM, Non-household gas prices H1 2026 (EU average €0.06/kWh) — https://wam.ae/en/article/c3347u4-eu-non-household-electricit-gas-prices-fall-2026
- Clean Energy Council / Energy.gov.au, Office energy use breakdown (HVAC 39%, lighting 25%, equipment 22%, lifts 4%, hot water 1%, other 9%) — http://energy.gov.au/sites/default/files/hvac-factsheet-energy-breakdown.pdf
- Carbon Trust, Reducing energy use in office-based companies (heating 20–40% of office energy costs; lighting maintenance up to 15%; light levels fall 30% in 2–3 years) — https://carbontrust.com/sites/default/files/documents/resource/public/CTV007_OfficeBasedCompanies-2021-update.pdf
- Lawrence Berkeley National Laboratory, Standby Power FAQ (standby 5–10% of electricity use in developed countries; higher in commercial buildings) — https://standby.lbl.gov/frequently-asked-questions
- University of Sydney Better Buildings, Extending air-temperature setpoints (22.2°C→25°C cooling setpoint: 29% cooling energy saved without reduced satisfaction) — https://cdn.sydneybetterbuildings.com.au/assets/2018/10/Extending-air-temperature-setpoints-Simulated-energy-savings-and-design-considerations-for-new-and-retrofit-buildings.pdf
- University of Georgia / US DOE guidance (≈3% energy savings per 1°C thermostat adjustment) — https://research.uga.edu/news/turn-up-the-thermostat-lower-energy-costs-no-complaints
- Pacific Northwest National Laboratory (US DOE), Use of Occupancy Sensors in LED Installations (measured savings from occupancy control) — https://www.pnnl.gov/main/publications/external/technical_reports/pnnl-21923.pdf
- Energy Efficiency and Economic Development journal (Springer), Power-use profile analysis of non-domestic consumers for electricity tariff switching (tariff switching as tenant-accessible lever) — https://link.springer.com/article/10.1007/s12053-015-9404-9
