Maximum demand is the maximum power value which is hit during the billing period, usually measured over a time period of about 15 minutes (this time period may be different in different countries).
If this value comes out higher than the contracted power, the user must pay a penalty on the electicity bill.
energyhelpline.com is a comparison site to help you switch to the cheapest supplier, which could save you hundreds of pounds, especially if you frequently hit maximum demand.
To find the best deals for your business call 0800 008 77 72. Our office hours are Mon-Fri 9am-5pm.