3 % In case i1 > c_max, it generates an amount of energy equal to its maximal capacity c_max, so op = c_max.
5 % f is our fossil plant
8 % can produce 60 KW max.
11 % define control i1 to 70KW (we request 70KW)
15 % expecting i1 to be 70
18 % and therefore we shall produce 60KW