Concentration of CO2 in the Atmosphere

NESEA 2013 Zero Net Energy Building Award

Thornton Tomasetti Project Earns
NESEA 2013 Zero Net Energy Building Award

The Coastal Maine Botanical Gardens Bosarge Family Education Center in Boothbay, Maine has been awarded the 2013 Zero Net Energy Building Award by the Northeast Sustainable Energy Association (NESEA). Thornton Tomasetti, the international engineering firm, served as the project’s green building consultant.

The Center is one out of a handful of net zero non-residential buildings in all of New England, and is the second commercial LEED Platinum building in Maine. The Net Zero Energy Building Award is NESEA’s annual search for the best building in the Northeast that captures as much energy as it consumes. To achieve this rating, NESEA requires the winning building to be one that offers not only efficiency, but also comfort, affordability, reliability and elegance.

Key Points:

  • The 8,200-square-foot LEED Platinum Education Center highlights the remarkable growth of Coastal Maine Botanical Gardens, which opened in 2007, on 128 acres of forest and tidal frontage. About 40,000 visitors came the first year. Since then it has expanded to 248 acres, becoming the largest botanical garden in New England and one of Maine’s top tourist attractions, with more than 100,000 visitors in 2012
  • The walls and roof that make up the building envelope are at least a foot thick, achieving an impressive efficiency rating of R40 in the walls and R60 in the roof. Special triple-glazed windows, among the most efficient that can be bought in the U.S, provide passive solar gain in the winter, while keeping out the heat in the summer. In addition, a recent energy audit of air leakage concluded that air infiltration at the facility is by far the lowest in the state.
  • To produce the energy load required to achieve Net Zero, the building is equipped with 135 photovoltaic panels on the south side of the roof, plus an additional 102-panel array on the ground. Payback from the solar system is estimated at 10 years.
  • The design was led by a collaboration between Portland-based Scott Simons Architects, which has been recognized nationally for innovative design, and Maclay Architects from Waitsfield, Vt. known for their sustainable, net zero expertise. In addition, Allied Engineering, also of Portland, collaborated with Energy Balance of Montpelier, Vt. to design and engineer the mechanical and electrical systems, which include a massive array of on-site solar photovoltaic electricity generation capable of generating 55,184 kilowatt hours. H. P. Cummings of Winthrop, Maine was the construction manager on the project. Becker Structural Engineers provided structural design services for the project. Bensonwood, of Walpole, New Hampshire, builders of high performance houses and commercial structures, produced and installed the super-insulated, tightly-sealed building shell.

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Thornton Tomasetti

About Thornton Tomasetti

Thornton Tomasetti is a leader in engineering design, investigation and analysis serving clients worldwide on projects of all sizes and complexity. With practices in building structure, building skin, building performance, construction support services, property loss consulting and building sustainability, Thornton Tomasetti addresses the full life cycle of a structure. We have supported clients working in more than 50 countries, with projects that include the tallest buildings and longest spans to the restoration of prized historic properties. Founded in 1956, today Thornton Tomasetti comprises more than 700 engineering, architectural and support professionals who collaborate from offices across the United States and in Asia-Pacific, Europe, Latin America and the Middle East.

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