"Baseline" refers to a specific amount of energy allocated for residential customers that is charged at a lower price than energy used in excess of that amount. California's regulated energy utilities are mandated to allocate a basic baseline quantity to each residential customer based upon that customer's geographic area, the season, and whether the customer has a single source of energy (i.e., if their home is "all electric"), or a combination of gas and electric ("basic" service). To view geographic areas (or baseline regions) for SCE customers and the amount of baseline allocations for these regions, visit the Baseline Allocation Chart and Baseline Regions Map.
Baseline quantities are established by the California Public Utilities Commission (CPUC) and are typically adjusted only when SCE is granted rate adjustments normally associated with a General Rate Case, generally every 3-5 years. The baseline quantity is billed on a daily basis at the lowest residential rate in effect.
Here, you will find additional Baseline information: