4. Consider the tables below. Table 1 includes information about the fixed cost of four generating technologies, Table 2 contains information about the variable costs of the same units, and Table 3 contains information about the technical parameters of these units. Please note that: CCGT stands for Combined Cycle Gas Turbine. OCGT stands for Open Cycle Gas Turbine. O&M stands for Operation and Maintenance and WACC stands for the weighted average cost of capital Table 1: Fixed Costs of Thermal Power Plants Unit Technology Capital Cost Life WACC Fixed O&M Cost Annualized [KSMWI [yeats) (9) IS/MW-year Capital Cost R$MW year) 1 Nuclear 5.333 40 7 8.750 489 2 Coal 3.167 40 10 35970 360 3 CCGT 978 20 10 14,390 129 4 974 40 10 6980 106 Variable Costs of Thermal Power Plants Unit Technology Variable O&M Cost Heale Fuel price Variable Cost [S/MWh) [MBTU MWh) [SMBTU] [S/MWh] 1 Nuclear 2.04 10.49 65 2 Coal 4.25 88 2.22 23.8 3 CCGT 3.43 705 781 585 4 14.7 10.85 781 99.4 Technical parameters of these units. Unit Technology Pimax Pimin Maximum Start-up costs Minimum [GW] (GW) ramp [MS start-up down time [GW] Minimum up time [hr] 1 Nuclear 1 0.9 0.03 1 20 20 2 0.5 0.1 0.05 6 6 Coal CCGT OCGT 0.21 0.32 0.4 0.1 0.00 3 3 4 0.3 0.15 0.36 0.004 0 0 Answer the following questions a. If the demand at 1pm is 12 GW.Formulate the Economics Dispatch (EC) problem. Consider all the relevant constraints. Make sure to define all variables and parameters in your problem. b. If the demand at 1pm is 1.2 GW. What is the solution to the Economic dispatch