There are actually several different energy types, without it, literally nothing will happen. But this isn't a science essay about "What is energy in physics?". The type of energy you will want to be comparing is electrical energy, or more specifically, companies that will provide you with electrical energy.
Even within this one area, energy types is still something that you might want to keep in mind. Depending on where you live, energy from different sources could come with additional taxes, or even fewer taxes. Fossil Fuel energy is the most common type, but you can also get nuclear energy and renewable energy. This might be something to consider when picking an energy provider. Although for others, finding a provider with the best value for money would make more sense than picking a provider based reducing your carbon footprint.
Some of you will be hear because you have just moved into a house and want to find the best energy provider. But others will want to compare energy companies because you intend on making a switch. Doing this could help you to save money and/or reduce your carbon footprint. Even if you don't intend on changing energy providers anytime soon, it could be wise to still have a browse so that you can keep your current provider on their toes, making sure they keep up with their services as they'll know you could easily switch if you choose to do so.
If you want to either get your first energy provider, have an energy switch, reading reviews allows you to make the decision about what is best for you, depending on your preferences. We have managed to collect a wide array of energy providers, allowing you to make the best judgement for yourself and your situation.