Purchasing energy for your business is like purchasing any other commodity. As always in industry, supply and demand of raw materials will heavily influence price.

But unlike some raw materials, when you buy energy, you must make certain you have a continuous supply. The key for someone buying energy is to make certain that they are buying at the best possible price to secure an uninterrupted supply.

Now that you can get quotes online at any time of the day or night, a smart buyer of business energy can use new tools to help negotiate the best deal. However, they should remain aware of the old realities:

1. Your situation dictates the type of contract you want. A simple fixed-price, fixed-term contract makes life easy and gives you peace of mind. But if you are spending thousand of pounds per month on your energy needs, flexible contracts will help you fine-tune your usage and pricing.

2. You know your usage varies - but it can decrease overall through efficiency. When you are selecting an energy provider, choosing one with proven experience in energy efficiency can reward you with significant savings.

3. Mind the details. You may find a great price from a new gas supplier. But how many customers do they supply? Do they know what they're doing in the switching process from your present energy supplier? What if you don't like their service - are you locked in? Is their customer service staff knowledgeable and responsive?

4. Whether your need gas or electricity, price is your first concern: Get the best quote you can from a reliable supplier - and that may include watching the market, and asking for a custom contract. But keep your eye on the rules as well. Larger companies need a Display Energy Certificate and an Energy Performance Certificate. Make sure they are readily available.

5. The future is Green. Schemes to sell surplus energy back to the grid can help save you even more; cleaner energy providers can pass on savings to you. Make sure you're buying greener and cleaner, as these trends are only likely to intensify.

Buying business energy may take a bit of smart shopping, but that diligence can result in substantial savings.