Mercury Solar Systems installed a 50.4 KW PV system in December, 2009. One of ATCO's contractors, Essential Design + Build prides itself on employing environmentally responsible design and construction. ATCO'S Essential Design + Build has earned their colors with LEED-accredited professionals whose expertise is complemented by a keen awareness of environmentally responsible materials and standards. As a certified US Green Building Council Contractor, Essential is able to provides sustainable construction that maintains environmental integrity.