; and (2) by adding at the end the following: (17) IECC The term IECC means the International Energy Conservation Code. (18) Indian tribe The term Indian tribe has the meaning given the term in section 4 of the Native American Housing Assistance and Self-Determination Act of 1996 ( 25 U.S.C. 4103 ). . (b) State building energy efficiency codes Section 304 of the Energy Conservation and Production Act ( 42 U.S.C. 6833 ) is amended to read as follows: 304. Updating State building energy efficiency codes (a) Voluntary building energy code Nothing in this section or section 307 makes a voluntary building energy code established under this section or an updated voluntary building energy code under section 307 binding on a State, local government, or Indian tribe as a matter of Federal law. (b) In general The Secretary shall— (1) encourage and support the adoption of building energy codes by States, Indian tribes, and, as appropriate, by local governments that meet or exceed the voluntary building energy codes, or achieve equivalent or greater energy savings; and (2) support full compliance with the State and local codes. (c) State and Indian tribe certification of building energy code updates (1) Review and updating of codes by each State and Indian tribe (A) In general Not later than 2 years after the date on which a voluntary building energy code is updated, each State or Indian tribe shall certify whether or not the State or Indian tribe, respectively, has reviewed and updated the energy provisions of the building code of the State or Indian tribe, respectively. (B) Demonstration The certification shall include a demonstration of whether or not the energy savings for the code provisions that are in effect throughout the State or Indian tribal territory meet or exceed— (i) the energy savings of the updated voluntary building energy code