Adoption of the 2009 New Mexico Energy Conservation Code was based on the requirements of the 2009 IECC. Residential structures must comply with envelope and system requirements, including thermal bypass requirements, of ENERGY STAR. Lighting requirements are also based on ENERGY STAR: 75% must be high-efficacy OR 50% of installed lighting must be ENERGY STAR certified. All residential projects must be 20% more efficient than the 2006 IECC. Commercial structures must comply with the 2009 IECC unless more energy efficient standards are provided by the NM code. Effective January 11, 2011.