sentences:  In addition, the building's photovoltaic solar roof tiles harnessed the solar power generated by the sun to create useful energy.MAREC then used a nickel metal hydride battery system to store some of the energy produced by these sources for use during peak energy consumption periods.The building was also constructed using many alternative and renewable building materials including flooring surfaces produced from fast-growing bamboo and recycled tires, and rigid wall surfaces made from pressed wheat.