The fuel-cost functions for three thermal plants in $/h are given by: C₁ = 0.004P2 +7.2P₁ + 350 $/h C₂ = 0.0025P2 + 7.3P₂ + 500 $/h C3 = 0.003P3 + 6.74P3 + 600 $/h Neglect losses and generators limits, a- Find the optimal dispatch and the total cost in $/h for a load demand of 800 MW. b- Calculate the save in cost in $/h if the load is equally distributed among the three plants.

Suppose that the P-Q load is known at each of the nine buses of a small power system and that synchronous generators are connected to buses 1, 2, 5 & 7. For a power-flow study, identify the number of equations to be solved: Select one: O a. 15 b. 13 c. 11 d. None of these Oe. 9

Sketch and label the main working components of a wind turbine. Describe the functionality of each of the parts.  List various foundation structure for offshore wind turbines and describe their advantages and disadvantages and relate their configuration to appropriate water depth.