No one can say for sure what the cost of electricity will do in the future. I’ll bet it would be hard to find anyone who realistically thinks these costs will drop.
Having an average lifespan of 30 years or more, solar energy systems are a long-term capital investment. PV systems are a fixed cost that works to reduce and smooth over variable costs. In other words, a solar-energy system protects your company from the cost inflation of electricity.