Print A community choice aggregation energy program in North County anticipates offering a default product to most of its customers that is about 2 percent less expensive than San Diego Gas & Electric, with a higher percentage of renewable sources. The Clean Energy Alliance — made up of the cities of Carlsbad, Del Mar and Solana Beach — will begin serving about 58,000 customers in May and June. As a CCA, it will replace SDG&E when it comes to purchasing power for those three municipalities. SDG&E will still maintain other responsibilities, such as delivering energy, maintaining infrastructure (poles and wires) and sending bills to customers each month.