Design your own question by designing an engineering economy problem for the Energy Systems Engineering field. The problem you designed includes investment options; Make sure that it is directly / indirectly related to renewable and / or conventional and / or hybrid energy systems. The problem you designed; Solve with Net Future Value (NFV), Net Present Value (NPV), Payback Period-2 (PV-2), Internal Profitability Rate (IPR) methods and express your preference for each method together with its rationale.