Source Energy refers to primary energy needed to extract and deliver energy to a site, including the energy that may be lost or wasted in the process of generation, transmission and distribution. In a net zero site energy building, for every unit of energy the building consumes over a year, it must generate a unit of energy. a building), regardless of where or how that energy originated. Site Energy refers to the energy consumed and generated at a site (e.g. The NREL publication Zero Energy Buildings: A Critical Look at the Definition explores definitions in detail, and it suggests four ways in which net zero energy may be defined: NREL presents several definitions for "net zero energy", and they encourage building designers, owners, and operators to select the metric that best fits their project. The Department of Energy (DOE) and the National Renewable Energy Laboratory (NREL) have spearheaded much of the work on net zero energy buildings to date. Renewable energy systems that meet these reduced energy needs.Īs the "zero energy" and "net zero energy" concepts are relatively new, there are not yet definitive, widely accepted zero-energy metrics.Exemplary building design to minimize energy requirements.While the exact definitions of metrics for "net zero energy" vary (this is discussed below), most agree that Net Zero Energy Buildings combine: As a result of advances in construction technologies, renewable energy systems, and academic research, creating Net Zero Energy buildings is becoming more and more feasible. Currently, there are only a small number of highly efficient buildings that meet the criteria to be called "Net Zero". The concept of a Net Zero Energy Building (NZEB), one which produces as much energy as it uses over the course of a year, recently has been evolving from research to reality. It can further reduce dependence on fossil fuel derived energy by increasing use of on-site and off-site renewable energy sources.
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The building sector can significantly reduce energy use by incorporating energy-efficient strategies into the design, construction, and operation of new buildings and undertaking retrofits to improve the efficiency of existing buildings. This fact underscores the importance of targeting building energy use as a key to decreasing the nation's energy consumption. Amid growing concerns about rising energy prices, energy independence, and the impact of climate change, statistics show buildings to be the primary energy consumer in the U.S.