What agreed supply capacity means
Half-hourly sites reserve a maximum demand with the distribution network, measured in kVA. You pay a monthly charge for that reservation whether you use it or not. It is usually set when the connection is installed and almost never revisited.
Finding the gap
Pull twelve months of maximum demand data and compare the peak to your agreed capacity. A site holding 200 kVA but peaking at 110 kVA is paying for 90 kVA of nothing, every month.
Reduce carefully
Leave a sensible margin — typically 10-20% above historic peak — and account for planned equipment. Exceeding your capacity triggers excess capacity penalties, which are considerably more expensive than the saving.
Want this reviewed for your business?
Send us a recent bill and a consultant from our Cardiff office will tell you, honestly, whether you are paying more than you need to.