Home Services USA, the US subsidiary of Homeserve, the home maintenance firm, has signed a five year contract with the Southern California Gas company to jointly market the company's home emergency services.Home Service USA will offer home emergency policies in southern California that can charged to customers' Southern California Gas (SoCalGas) accounts.SoCalGas has around 5.3m residential customers in southern California."This agreement builds on our successful strategy to partner with gas utilities in the US and follows the recent announcement of our agreement with National Grid earlier this month," said Homeserve's chief executive officer Richard Harpin.