Workshop energy costs, and where it goes.

Compressed air is an expensive habit

Air feels free because nothing arrives in a tank, and it is one of the most expensive things a workshop produces.

A compressor turning electricity into compressed air is inefficient, and a leaky system replaces unused air. The classic test: shut down at day's end and listen; if the compressor runs overnight, you're paying to fill a leaking system while empty.

Leaks are easy and inexpensive to find and fix, mainly at couplings, hose ends, and tool connections. Repairing them often yields the biggest drop in garage energy costs, taking just an afternoon with soapy water and a marker.

Heat escapes through the door you keep opening.

A garage with a large opening can't be heated like an office, and trying to do so wastes money.

• Heating the entire space when only the work area needs to be warm.
• A main door left open longer than necessary for vehicle movement.
• Destratification, or lack thereof, keeps warm air at roof height.
• Uninsulated roofs and walls let heat escape as quickly as it's generated.
• Heating overnight and at weekends with a timer no one has checked since it was set.

The cheapest fixes are behavioural and setup, not capital: close the door between movements, ensure the timer matches your hours, and bring warm air down to where people are.

Lighting is straightforward and worth doing right.

Lighting is often the first change, yet it’s frequently incomplete.

Modern fittings consume much less power and last longer, making replacement simple. What’s overlooked is control: sensors in intermittently used areas, separate switches to avoid lighting the entire building, and adequate light at working height instead of just a general glow.

Better lighting boosts productivity, which isn’t reflected in energy bills. Diagnosis is quicker and errors are reduced under proper light, making this a rare overhead cut that enhances work quality.

Equipment left on

Every workshop has items left on, as switching them off is a choice no one made.

Compressors pressurised overnight, welders and chargers powered, extraction running in empty bays, screens and computers never turned off, and the kettle that’s really a heater. Individually minor, but collectively a constant load when the building is empty.

A closing checklist solves this, covering alarms and shutters. One habit, multiple issues.

The tariff and contract are valued at an hour

All the above cuts what you use, and the other half of a bill is what you pay per unit.

Workshops often remain on a rolled-over contract at an out-of-contract rate, the priciest tariff available and easy to exit. Knowing your contract end date and setting a reminder well in advance is more valuable per hour than most operational improvements here.

Check if your usage pattern fits a different structure. A workshop with heavy daytime use and little overnight has a different profile than one operating 24/7, and a poorly matched tariff can quietly drain funds, no matter how efficient the building is.

Measure before investing funds

The urge is to purchase, but first measure, address the free fixes, then decide.

A garage aware of its base load—power used when idle—can quickly identify how much of its bill is due to leaks, standby, and timers instead of actual work. This figure often surprises and can justify or dismiss a capital investment.

Start with free or low-cost fixes, then measure again. Choosing solar, a new compressor, or heating is wiser when the building isn’t already wasting a third of its usage.