In general, the concept of energy refers to "the potential for causing changes". The word is used in several different contexts. The scientific use has a precise, well-defined meaning, whilst the many non-scientific uses often do not. (see here.)

In physics, energy is the ability to do work and has many different forms (potential, kinetic, electromagnetic, etc.) No matter what its form, physical energy has the same units as work; a force applied through a distance. The SI unit of energy, the joule, equals one newton applied through one meter, for example.

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DOE Building Energy Codes Website

U.S. Senate Legislation Would Extend Existing, Create New Energy Efficiency Tax Incentives
Wed, 07 Oct 2009 00:00:00 -0700
On August 7, 2009, Senators Olympia Snowe (R-ME), Diane Feinstein (D-CA) and Jeff Bingaman (D-NM) co-sponsored bi-partisan legislation in the U.S. Senate to extend the $2,000 tax credit for energy efficient homes to December 31, 2012 and create a $5,000 credit for homes that use 50% less whole house energy than the 2004 IECC.
Waste Not, Watt Not
The American Clean Energy and Security Act, H.R. 2454, -- which passed the House and is now pending in the Senate -- recognizes and invests in the economic benefits of energy efficiency. The bill would provide up to $65 billion in allowances from 2012 to 2020 for state and local government energy efficiency programs.
Hawaii Building Code Council Approves 2006 IECC Statewide Code
The Hawaii Building Code Council approved the 2006 IECC with state-specific amendments as the statewide energy code. The code will become law once an Administrative Directive is approved, which is expected to be signed soon by Gov. Linda Lingle. The counties of Hawaii are free to modify the statewide code, as long as the codes they adopt are at least as stringent. 
Recession Not Dimming States' Growing Focus on Energy Efficiency as "First Fuel"
Wed, 21 Oct 2009 00:00:00 -0700
The current economic downturn is not sidetracking state-level efforts to make the most of energy efficiency as the cheapest, cleanest and quickest of all energy resources, according to a 50-state scorecard on energy efficiency policies, programs, and practices from the American Council for an Energy-Efficient Economy.
Northern Marianas Islands Adopt 2009 IBC, Tropical Energy Code
The Commonwealth of the Northern Mariana Islands (CNMI) Department of Public Works has adopted the 2009 International Building Code for residential and commercial buildings, including the code's energy provisions.
Washington pushes for energy code changes
Fri, 25 Sep 2009 00:00:00 -0700
A bill passed this year requires the Washington State Building Codes Council to adopt more energy-efficiency codes for buildings beginning in 2013.

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