On May 7, 2012, we convened our 19th Annual E Source Energy Managers’ Roundtable (EMR), an intimate workshop with the top corporate energy managers in North America. We spent three days networking, taking field trips to innovative buildings, sharing best practices, and learning from industry experts. One key component of the EMR is the level of discussion on what’s working and what’s not working in the world of corporate energy management. Here are three lessons we learned at this year’s EMR.