The thermodynamic properties of Go-Pr alloys have been determined between 973 and 1073 K by electromotive force measurements on galvanic cells employing CaF2 as a solid electrolyte. Results yield a complete set of thermodynamic functions for the intermetallic phases (Co), Co17Pr2, Co5Pr, Co7Pr2, Co3Pr, and Co2Pr which are compared with data for analogous alloys available from the literature and with predicted values from the Miedema model. The influence of the electronic structure of the components on the energetics of alloy formation is discussed.