Thanks LTYC for sharing that important info with us.
The website says:
Why are my energy prices changing?
We typically review our prices every year in line with movements in our costs of supplying energy to you.
What makes up my energy prices?
Wholesale CostsEnergy retailers incur costs when they purchase electricity and gas from generators and producers to retail it to customers.
Network CostsNetwork costs are the costs of transporting electricity and gas to your house. These costs include the cost of building, maintaining and operating the natural gas pipelines and electricity poles and wires that transport energy to your home or business.
Environmental CostsEnvironmental costs are incurred by energy retailers to comply with government programs designed to provide incentives for energy efficiency and to support the development of renewable electricity.
Retail Operating Costs and MarginYour electricity and gas prices include retail operating costs, including managing billing and payments and for the full range of customer services we provide, and a retail margin.