In order to promote carbon neutrality as soon as possible, the BJ local government has announced a 10-year BOT bidding project for a 2.5 megawatt solar power plant. The BOT tender specifies that the operation period of the project is limited to 10 years, and the electricity procurement price is S $0.13 per kilowatt hour ($0.13/kWh). The peak sunshine hours of the project per year are 1500 hours. The cost of solar panels is S $800000 per megawatt, and the maintenance cost of solar panels is $0.008/kWh. The reduction in solar cell production capacity within 10 years is negligible. The civil engineering cost is S $330000, and the installation cost is S $65000 per megawatt. Please answer the following question: Calculate the total investment in the overall equipment and construction of the solar power plant? And how many kilowatt hours of energy can be generated annually? Assuming energy sales of $0.15/kWh, how many years will it take for the solar power plant to reach breakeven? Assuming that the bank is willing to loan S $1.5 million to NPCA New Energy Company, which can repay the principal and 4% simple interest per year within five years, and achieve breakeven within five years, how can NPCA New Energy Company enhance its competitive advantage in terms of kWh selling price?