Alex Watt, the owner of Upstart Solar Systems, needs to provide quotes to potential customers for the design and installation of residential solar energy systems. Alex has an engineering background and has come to you for assistance in building a template to provide relevant financial information to customers. Alex let you know that the information provided to customers needs to be both accurate and positive so the business can grow.

Upstart Solar Systems is located in British Columbia $($BC$).$ In BC$,$ any excess solar energy production is fed back into the hydro grid providing credits that customers can use during the winter when the days are shorter and there is less direct sunlight. BC Hydro has installed $$Smart$$ meters that can measure electricity use and measure excess energy being fed back into the grid.

Alex wants to cast Upstart Solar Systems in the best possible light but does not want to be deceptive. Alex asked you to provide a report and three scalable spreadsheets that can be shared with customers:

Solar energy system payback period not considering the homeowner$$s cost of capital.

Solar energy system net present value with a $3\%$ cost of capital.

The IRR over the expected life of the system.

Upstart Solar Systems has supplied you with the information they think you need to complete your analysis:

Alex has had long discussions with experienced real estate agents. They believe that the value of the customer$$s home will increase by $75\%$ of the price of the solar energy system. This amount would only be realized if the customer sells their home. Since most people occupy several homes during their adult life, you can assume a return of $75\%$ of the original full cost at the end of year $15.$

The average customer will pay Upstart Solar Systems $$17,000$ to supply and install a rooftop solar system. However, similar to electric vehicles, customers can apply for a federal Green Homes Grant that will give them a $$5,000$ grant. Therefore, customers have a net cost of $$12,000.$

The system output depends on sunlight. Alex informed you that the average system will supply $8,000$ KWh of electricity yearly. The system is designed to last for $30$ years. You should understand what a KWh is before preparing your case.

The average household uses $9,700$ KWh of electricity per year. Alex wants your spreadsheets to start with this usage and be scalable for various levels of use.

BC Hydro has two rate tiers. For this case, assume Step $1$ allows up to $22\mathrm{.}1918$ KWh of electrical use per day at a current rate of $ $0\mathrm{.}0950$ per KWh$.$ Electrical use over this amount is charged at the Step $2$ rate of $ $0\mathrm{.}1408$ per KWh$.$ There is a base charge of $$6\mathrm{.}78$ per month that customers pay regardless of electricity use. You can assume that with an installed solar energy system, the customer will no longer use electricity at the Step $2$ rate.

Although future rates are unknown, with the increase in the number of electric vehicles and the demand on the electrical grid, no one thinks electrical rates are going down. Alex suggested that you use an average yearly increase of $2\mathrm{.}5\%.$