When comparing electric generation suppliers you need to know the Annual Price-to-Compare and the Average Annual Cost (cents per kilowatt hour or kWh for short) that a supplier must beat (compared to DP&L's standard offer rate) in order for you to save money. In other words, the Annual Price-to-Compare is the amount that you no longer have to pay to DP&L when you choose an alternate electric generation supplier.
If you are a residential customer, you will find your Price-to-Compare in the bill message on your monthly DP&L bill. If you are comparing electric generation suppliers on price, paying a lower price in cents per kWh should result in a lower electric bill. However, suppliers may charge other fees and all costs should be considered before choosing a supplier (Read What to Consider).
Since 1996, when the energy market was opened up to competition, UK consumers have been able to switch energy suppliers to find a cheaper gas and electricity deal. Previously, Ofgem did set a maximum price for energy; but now Ofgem only regulates the market as a whole — that means creating a regulating schemes to support vulnerable households and more.