Network expansion decisions are usually made throughout 10 years of operation. In other words, any investment made in the grid would be compared against benefits in terms of operation for the next 10 years. HIPC is experiencing an increase in demand and expects their demand to increase 10% per year in the 10-years. To address this issue, they hired you to find out what they should do if they want to (i) keep the voltage of all buses within 0.9, and 1.1 p.u and (ii) serve all the demand (assuming that the demand at each bus remains the same the entire 8760 hours of a year)