Passive House offers the potential for true energy independence. With its conservation first approach, Passive House minimizes the energy needs of a building very dramatically right up front. This reduction allows for smaller renewable energy systems like solar photo voltaic or solar thermal to become very effective. In most circumstances, a Passive House building can be designed and retrofit to meet these standards:
- Net Zero Site Energy: A site ZEB (Zero Energy Building) produces at least as much energy as it uses in a year, when accounted for at the site
- Zero Utility Bill: Produce enough energy on site to offset the cost of all utility bills
- Net Zero Source Energy: A source ZEB produces at least as much energy as it uses in a year, when accounted for at the source. Source energy refers to the primary energy used to generate and deliver the energy to the site. To calculate a building’s total source energy, imported and exported energy is multiplied by the appropriate site-to-source conversion multipliers (to account for transmission losses)
- Net Zero Energy Costs: In a cost ZEB, the amount of money the utility pays the building owner for the energy the building exports to the grid is at least equal to the amount the owner pays the utility for the energy services and energy used over the year
- Net Zero Energy Emissions: A net-zero emissions building produces at least as much emissions-free renewable energy as it uses from emissions-producing energy sources. This is sometimes referred to as a carbon-neutral building
- Carbon Offset and Net Positive Energy: A building offsets more CO2 than produced at the provider to deliver the energy consumed on site. It produces more energy than used at provider to deliver site energy. In this case, the building helps offset energy used elsewhere
All the above options offer a clear path to energy independence—both for the building, as well as society. An energy independent building is a true asset for an uncertain energy future. Imagine a home that pays you, rather than you having to pay for it.