The Boston Redevelopment Authority (BRA) is expanding its Green Triple Decker project from two to five residential buildings.

The project aims to improve the energy efficiency of Boston’s triple-deckers, according to a statement. The BRA has partnered with the federal Energy Star program, local utilities NSTAR and National Grid and Historic Boston Inc. on the project.

The Green Triple Decker program will provide grants, matched with utility incentives, to qualifying owner applicants to achieve significant energy performance improvements in Boston’s historic triple decker housing style, according to a statement. The BRA is ready to accept applications, and triple decker owners should be individuals who have planned some renovation work, are willing to work with a team of building energy efficiency experts to develop their project and are ready to proceed logistically and financially.

"Tackling energy inefficiency in Boston’s housing is one of Mayor Menino’s sustainability and economic development priorities," said John F. Palmieri, BRA director. "Leaky buildings cost residents more to heat and cool, and increase the city’s overall greenhouse gas emissions. In fact, the city’s climate change report found that residents and businesses could save over $2 billion in energy expenses over 10 years if we reduced our green house gas emissions by 25 percent."

Program applicants can visit www.greentechboston.com. The first review occurs Oct.15.