Energy companies must make their prices more transparent, the consumer watchdog ACM says.

Research carried out by the ACM shows that 90% of consumers do not understand the correlation between prices, contract and energy bills.

Energy companies do not use a uniform language and the price on offer is often made up of various elements. Nor is it always clear if the price includes value-added tax (btw) or not.

Because of this, consumers are unable to compare the prices of the different suppliers, says the ACM.

The watchdog wants energy companies to submit suggestions for solving these problems.