Energy yield:

Each of the three NADH molecules produced per turn of the cycle yields 3 ATPs and the single FADH₂ yields 2 ATPs through oxidative phosphorylation (while some measurements indicate in which the quantities are 2.5 and 1.5 respectively - see p.  380).  One  GTP  (or  ATP)  is  synthesized  straightly  during  the  conversion  of succinyl CoA to succinate. Therefore the oxidation of a single molecule of glucose through the citric acid cycle produces 12 ATP molecules.