Electricity saving guide for businesses
A guide to cutting business electricity costs: bill analysis, LED, climate control, reactive power, demand charges, refrigeration and rooftop solar, with an estimator.
In commercial premises such as offices, shops, restaurants, hotels and workshops, electricity cost comes from both consumption and tariff and contract decisions. Understanding the bill and load profile first, then focusing on lighting, climate control and refrigeration gives the fastest results.
Quick wins
No-cost or very low-cost changes to habits and settings.
LED, sensors and daylight control
Replace fluorescent and halogen fittings with LED; add motion sensors to storage, corridors and restrooms and daylight control by windows. Define an end-of-day switch-off routine.
Office and equipment power management
Shorten sleep/shut-down timers on computers, printers and monitors, cut power with switched strips after hours and avoid over-conditioning server and cold rooms.
Investments
Equipment upgrades or infrastructure; evaluate them by payback period.
Climate control (HVAC) and maintenance
Use programmable thermostats to relax set-points out of hours, service filters and condensers regularly and switch units off in unused spaces. For older equipment consider inverter/VRF systems and small envelope upgrades (window film, shading).
Refrigeration (shops, restaurants, hotels)
Fit doors or night blinds to open display cabinets, keep condensers and evaporators clean, renew door seals and avoid unnecessarily low set-points. Inverter compressors are worth considering for old units.
Sub-metering and monitoring
Meter major loads separately (lighting, HVAC, kitchen/refrigeration) and report monthly. What is not measured cannot be managed; deviations such as systems left on or failing equipment surface quickly.
Rooftop solar and self-consumption
Daytime businesses match generation to consumption, so rooftop solar is a strong candidate. See the Licence-exempt Producer Guide and the Solar Calculator for rules, netting and payback estimates.
Tariff and contract side
Tariff, contracted power and time-of-use decisions that cut the bill for the same consumption.
Review the bill and tariff group
Your subscriber group, connection voltage and the single/dual-term and single/multi-rate choices directly change unit cost. Review 12 months of bills line by line; being on the wrong group or an oversized contracted power is a common loss.
Reactive power and compensation
Under current rules, for subscribers above a certain installed capacity (roughly 50 kVA), extra charges apply if inductive reactive energy exceeds 20% of active energy, or capacitive exceeds 15%; limits differ for smaller subscribers and groups such as residential and lighting are excluded. For sites with many motors, AC units or ballasts, an automatic compensation panel removes the charge; confirm the current limits with your distributor.
Contracted power and demand charges
On a dual-term tariff you pay a monthly demand charge on contracted power: oversized means wasted cost, undersized triggers excess charges. Review it against your real peak load and stagger large simultaneous loads.
Operating hours and time-of-use tariff
Move deferrable tasks (cleaning, prep, charging, thermal storage) to night or low-price hours. Compare single and multi-rate tariffs using your own profile in the Bill Calculator.
Savings estimator and checklist
Enter your average monthly bill and tick the measures you have applied or plan to; see the estimated annual savings range. Your selections are stored only in this browser.
0 of 9 measures selected
Estimated annual savings
Tick a measure.
This is a rough estimate: measures reduce each other's effect, so effects are combined rather than added and the total is capped at 40%. Actual results vary by site or home; firm figures need metering or an energy audit.
Frequently asked questions
Where should a business start?
Start from the last 12 months of bills: tariff group, contracted power, reactive charges and monthly swings. Then meter the main loads (lighting, HVAC, refrigeration) separately and target the largest share.
How do I avoid reactive power charges?
Track the reactive-to-active ratio; if limits are exceeded, install an automatic power-factor compensation panel and service it regularly. Confirm current limits and practice with your distributor.
Does an LED retrofit really pay back?
In long-hour premises (shops, offices, hotels) it usually pays back in 1-2 years, plus lower lamp and maintenance costs. Calculate your own period from unit price, fitting count and operating hours.
Rates and periods in this guide are typical ranges based on general industry data; they vary by site and home and do not replace metering or an energy audit. For regulations and incentives, rely on current official sources.
Let's look at your situation together
Share your bill or facility and we can review which steps fit you.