Energy charge is calculated based on how much electricity was used. It is broken down in 1st Tier, 2nd Tier and 3rd Tier, and this charge is applied only to Meter Rate Lighting Plans. Our Guaranteed Savings Meter Rate Lighting Plan uses a 3-Tier rate structure, which is the same as the Meter Rate Lighting Plans offered by regional electric companies, where the more electricity you use, the higher your rate gets on a tiered basis. Please note that tiered rates are not applied to Low Voltage Plans. For details, check the Plan Information Statement you receive during the contract.