A small cogeneration system rated at 100 kW rated at 80% overall efficiency and 30% electrical efficiency. Estimate the potential cost-effectiveness of deploying this system for a building that purchased electricity at \($0.15/kWh\) and generate heat from 85% efficient boiler using natural gas at \($15/therm.

The cost of the system is estimated at \($200,000.\) For the analysis, consider a maintenance cost of \($0.85/hour\) with an operation period at full load of 6,000 hours per year and a lifetime of 40 years with a discount rate of 5%.