There is limited measured energy performance knowledge generated from certified zero-carbon institutional buildings in Canada. The objective of this study is to compare as-built energy and performance models with operational energy consumption and energy generation data to validate if Canada’s first dual certified (design and performance) zero-carbon building (ZCB) is operating as intended, and to determine the cause of any variances between the modeled energy values and the measured energy consumption values of independent variables. A formal review of design methodologies, technical specifications and reports, energy targets and metrics was undertaken and summarized. Building operations data and generated renewable energy data collected over the first four years of operations consisting of energy use intensity (EUI), thermal energy demand intensity (TEDI), process loads, solar photovoltaic (PV) generation, and solar thermal domestic hot water (DHW) production has been compared to as-built modeled values and design targets of the study building. The findings of this study demonstrate the building has outstanding performance metrics and is operating as a net zero-energy and zero-carbon building. The average EUI is 65% of the targeted design EUI of 72 eKwh/m2-yr. and the building energy consumption is approximately 66% of the PV energy generation. However, independent variables, consisting of occupancy-based loads, have contributed to reduced energy consumption and an over-designed PV array capacity. This has resulted in a significant difference between several modeled energy values versus consumption energy values. Inaccurately modeled variables in a ZCB may lead to unintended consequences such as higher energy production than necessary and associated higher costs, which occurred with the study building.