The Cheapest, Greenest kWh Is the One You Don't Consume: A Guide to Voltage Optimisation

UK mains electricity is typically supplied at close to 242 volts. Most modern equipment, including lighting, motors, IT hardware, and refrigeration, is designed to run efficiently at closer to 220 volts. That gap between what’s supplied and what’s actually needed is pure waste, and businesses pay for every volt of it.

Voltage optimisation sits between the incoming supply and your building. It brings that voltage down to what your equipment actually needs — with no change to how staff work or how your systems run.

Across the sites we manage, voltage optimisation typically cuts 19% off electricity spend and 9% off demand charges (what you pay for how much power you draw at once), with a typical payback inside two years.

It’s one of the least visible changes we make for a client, and consistently one of the most cost-effective, because it cuts the amount of energy a building needs before a single conversation happens about tariffs, generating power, or buying contracts.

That order matters. The cheapest, greenest kilowatt hour is the one that is not consumed — and voltage optimisation is one of the fastest ways to stop using it.