April 30, 2015
On Thursday, April 30, 2015, the President signed into law:
S. 535, the "Energy Efficiency Improvement Act of 2015," which specifies various Federal actions to increase energy and water efficiency in commercial buildings and adjusts a Department of Energy efficiency standard for grid-enabled water heaters.
Barack Obama, Statement by the Press Secretary on S. 535 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/319535