Spend $300 now and SAVE $45 each year... ROI = 15%
Bring light into upper level rooms that do not have enough windows, or, perhaps, any windows at all. When adding or replacing existing skylights, choose ENERGY STAR® qualified skylights with a U-Factor of 0.60 or less. Skylights not only save you money by reducing the need to power as many interior lights during the day, but they also visually enhance your office.
You do not need solar panels to make electricity when the first step is to reduce your waste and SAVE money.