You own a home, and are sick and tired of paying the power bill each month ($150/month incl. taxes). You have done some research on solar panels, and have decided to explore the economic feasibility of the project. After obtaining several quotes from qualified contractors, you determine that on average, a system that offsets 100% of your power needs will require an up-front investment of $20,000 (all-in cost). The expected lifespan of the equipment is +25 years, and electricity rates are expected to rise 5% per year forever. You only expect to live in the house for 10 years, and your other option is to invest in the stock market at an annualized return of 8%.

Which investment option offers the better return?