The City of Boston's 2019 Climate Action Plan (CAP) update identified high-priority strategies to accelerate progress toward the goal of making carbon neutral by 2050.

The City of Portland has an ambitious commitment to be fossil-free by 2050 through its 100% Renewable Energy Resoultion, and the city is also a signatory to the C40 Net Zero Carbon Buildings Declaration.

As leading cities and states seek to meet their aggressive climate, energy, and decarbonization goals, they are turning increasingly to mandatory policies that require improved energy and emissions performance across their existing building stock. The most comprehensive of these policies is the BPS, in which performance thresholds are set that building owners must meet at a specified time or when a triggering event occurs. A BPS can address a range of emissions, energy and grid-related goals. This paper examines technical approaches used to set the key metrics for both buildings and fuels in performance standard legislation.