The mapping tool would provide another dimension to the gas giant's energy survey, which 1.5 million customers have completed to date.
Alan McLaughlin, head of media relations at British Gas, said the project was in the early stages, but could go live this summer.
McLaughlin said: "It's extending what we're doing with the energy survey report by providing more functionality. Once people complete the energy saving audit, they might want to see how they can compare with other people in their area or other parts of the country."
He added that British Gas was negotiating the deal directly with Google, rather than through an intermediary.
British Gas has focused its recent marketing efforts on emphasising its green credentials and showing consumers how to reduce energy consumption.
Last winter, it ran an above-the-line advertising campaign telling customers how to save money and the planet at the same time through actions such as turning the thermostat down one degree.
The campaign, which ran across all media, particularly television and print, was booked by Carat.
McLaughlin added that British Gas had the lowest carbon emissions of any energy company in Britain because it derived its power from gas and some wind, rather than coal.