Which credit rewards the installation of energy-efficient appliances?

The correct choice focuses on the Optimize Energy Performance credit because this credit is specifically designed to encourage energy efficiency within a project's design and operation. The integration of energy-efficient appliances directly supports the goal of achieving better energy performance by reducing energy consumption and increasing overall efficiency in building operations.

This credit recognizes not only the use of energy-efficient appliances but provides opportunities for projects to quantify their energy savings. By implementing such appliances, a project can demonstrate lower energy use than a baseline scenario, which is a key factor in achieving points under this credit.

In contrast, while Energy Star Appliances is related to the use of high-efficiency appliances, it is not a specific LEED credit on its own. Renewable Energy Credits pertain to generating energy from renewable sources rather than appliances, and Innovative Energy Solutions generally refer to unique strategies that go beyond standard practices without specifically targeting appliances. Thus, Optimize Energy Performance is the most relevant credit for recognizing the installation of energy-efficient appliances in the context of LEED certification.