Measure carbon, not energy
For decades, energy consumption has been the key metric for assessing how “green” a building is.
As the consequences of climate change have become clearer, both governments and private sector organizations have set targets for carbon emission reductions.
Enter the Zero Carbon Building Standard (ZCB). This new standard is the only standard in North America that uses carbon as the key performance metric. This enforces the importance of energy efficiency, while also making us think carefully about the types of energy we use and encouraging more renewable energy generation both on and off the building site.
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How the Standard works
In simple terms, the CaGBC Zero Carbon Building Standard measures a zero carbon balance. This is demonstrated by achieving a net emissions balance of zero or less. This means that no net greenhouse gas (GHG) emissions are associated with building operations. GHG emissions are offset by generating clean, renewable energy onsite or offsite.
Read more here about how we determine what qualifies as a Zero Carbon Building, or click on the headings below for explanations.
Demonstration of Annual Zero Carbon Balance
The program requires GHG emissions associated with building operations to be offset with low-carbon renewable energy, either generated onsite or obtained from offsite sources through a contractual arrangement.
Providing a Zero Carbon Transition Plan
If you currently, or plan to, rely on onsite combustion of fuels other than zero emissions biofuels, like dedicated energy crops or ethanol and biodiesel, you must develop a transition plan to demonstrate how the building will decarbonize in the future. If it’s a new construction project you need to show that you have made provisions for de-carbonizing in the future.
Installing a Minimum of 5% Onsite Renewable Energy
The ZCB-Design certification requires that at least five per cent of the building’s total energy consumption be met using renewable energy that is generated onsite, such as by using solar photovoltaics (PV). Generating onsite renewable energy helps to improve building resilience in the face of power outages, reduces overall demand from the electrical grid, minimizes environmental impacts from power generation facilities, and helps prepare for a distributed energy future.
Achieving a Thermal Energy Demand Intensity Target
Thermal energy demand intensity (TEDI) refers to the annual heat loss from a building’s envelope (i.e., walls, floors, roofs and doors) and ventilation, after accounting for all passive heat gains and losses. We’ve set specific TEDI targets for ZCB-Design certification, which results in greater resilience and occupant comfort, while ensuring that building designers focus on minimizing a building’s demand for energy before producing or procuring renewable energy.
Reporting of Energy Use Intensity
The ZCB Standard requires applicants to report Energy Use Intensity (EUI) in order to create transparency and enable the industry to learn from each zero carbon building. Reporting EUI also enables the operators of a building to gauge the effectiveness of energy conservation measures and demonstrate progress over time.
Reporting of Annual Peak Demand
Zero Carbon Building projects must report peak electrical demand. This will help reduce the use of more carbon intensive electricity generation plants, decrease stress on the electrical grid and avoid the need for additional generation capacity.
Reporting of Embodied Carbon
Applicants for Zero Carbon Building certification are required to report the embodied emissions of their building’s structural and envelope materials using life-cycle assessment (LCA) software. This will help better inform the choices of materials when designing or retrofitting a building.
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Designed for everyone
When we designed the Zero Carbon Building Standard we gave particular thoughts to making it flexible.
Unlike other standards that proclaim to create zero carbon projects, CaGBC’s standard is the only one in the market place that:
- Uses Carbon as the main performance metric.
- Is broadly applicable to all types of buildings, new and existing.
- Recognizes the inherent differences in regional energy sources, including local electricity production.
- Is flexible enough to allow all buildings to participate, regardless of local grid constraints.
Two great examples of this are Canada’s first Zero Carbon Building – Design certified projetcs, evolv1, and Mohawk College’s Joyce Centre for Partnership & Innovation. Among a group of 16 Pilot Projects, they demonstrate that zero carbon is a practical outcome.
Canada’s first Zero Carbon Building – Performance certification, 100 Murray St. in Ottawa, illustrates how existing buildings can achieve Zero Carbon through energy efficiency and a focus on clean sources of energy.
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The Zero Carbon Building Standard was designed with everyone in mind. When we created the Standard we wanted to allow owners of both new construction projects and existing buildings to apply for certification. Our pilot projects include institutional buildings, offices, multi-unit residential and commercial warehouses ranging in size from 20,000 to 1.3 million sq. ft.
New buildings can be designed for optimal efficiency and resiliency, so these projects present the best opportunities to achieve Zero Carbon Performance and create a low carbon building stock for future generations. They can readily integrate renewable energy generation and select technologies that avoid the onsite combustion of fossil fuels, earning Zero Carbon Building – Design certification. Buildings built today that are not designed for low carbon emissions will require expensive retrofits within the first 30 years of their life.
At the same time, over 80 per cent of existing buildings will still be in operation in 2030 and 50 percent in 2050, and therefore existing buildings also need to be addressed in order to meet GHG reduction targets for the building sector. To help retrofit these buildings, as much flexibility as possible has been provided, so that buildings can achieve Zero Carbon Building – Performance certification.
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