A consulting firm that specializes in energy efficiency and sustainable design. Extensive experience in energy audits, energy engineering, retro-commissioning, commissioning, LEED certification, and energy plan development. Sieben Energy Associates is a strategic and technical consulting firm that specializes in energy efficiency, sustainable design, and energy management solutions. With extensive experience in energy audits, energy engineering, retro-commissioning, commissioning, LEED certification, and energy plan development, Sieben Energy partners with its clients to reduce operating expenses and increase facility and shareholder value. Since 1990 Sieben Energy has helped hundreds of clients in the commercial, industrial, institutional, and government sectors identify ways to reduce their energy expenditures and implement practical, energy savings solutions for new and existing buildings. We work both locally in the Chicago market and on a national basis.