Tesco, which operates in the United States through a partnership with Safeway, has alreadyonline service in the San Diego, San Francisco and Sacramento areas of California, as well as in Portland, Ore., and Vancouver, Wash.
Tesco did not say where the new service will launch, but the Vons.com site says it is debuting online services in Orange County, the San Fernando Valley, the San Gabriel Valley and West Los Angeles.
The company's move comes as the online grocery market as a whole is showing some signs of recovery from the dot-com bust and from the demise of companies such as Webvan.
In the United States, Safeway operates stores under the Vons, Pavilions, Carr?s, Dominick's, Randall's, Tom Thumb and Genuardis brands. Its online stores use technology from GroceryWorks.com, a joint partnership between Safeway and Tesco.
In the United Kingdom, Tesco announced this week that sales at Tesco.com rose 27 percent in the first half of the year, compared with the same period last year. The site recorded a profit of $2.91 million (1.9 million pounds), excluding one-time charges for the GroceryWorks launch. The company says it now takes 85,000 weekly orders.
Tesco said it recently launched grocery shopping through personal digital assistants in an effort to boost use. Tesco also plans to expand further into Ireland and Korea, the company said.