Incipient equilibrium structure II hydrate data for the propane + triethylene glycol (TEG) + water system at glycol concentrations of 10, 20, and 30 mass % in water are reported, The isothermal pressure search method was employed. Experiments were conducted in the temperature range of 270.2 to 276.8 K. Triethylene glycol was shown to have considerable inhibiting effect on propane hydrate formation. However, it was not as effective as an inhibiting agent as sodium chloride or methanol.