When installing solar panels on an existing structure, it is also an appropriate time to
upgrade lighting and other sustainable design features. This will provide the most energy efficient upgrades as a whole to maximize return on investment in the facility over a period of time. Efficient lighting upgrades work well in conjunction with solar panels supplying much of the power needed. When designing new structures with solar panels, it is important to coordinate lighting, electric vehicle, and other systems carefully to achieve the best energy efficiency for the entire facility.