Which LEED version introduced the concept of "optimize energy performance"?

The concept of "optimize energy performance" was indeed introduced in LEED v4. This version of the Leadership in Energy and Environmental Design program marked a significant evolution in the approach to energy efficiency within buildings. The emphasis on optimizing energy performance means that projects are encouraged to implement strategies that exceed basic energy code requirements, leading to reduced energy consumption and greenhouse gas emissions.

In LEED v4, there is a more rigorous framework for measuring and improving energy performance that also includes a focus on whole-building energy simulation as a tool for achieving better results. This framework not only advances energy efficiency but also promotes the use of renewable energy sources.

Earlier versions, such as LEED v2 and LEED v3, approached energy performance but did not encapsulate the idea of optimization in the same comprehensive way as LEED v4. As a result, the introduction of this specific and proactive focus on optimizing energy performance became a pivotal moment in the evolution of the LEED program.