A systematic study of the power threshold for L–H transition has been conducted in TCV. Only results from NB heated plasmas are reported. The dependencies of on plasma current, plasma density and main ion species have been investigated. For deuterium plasmas and at low , the L–H power threshold dependence on density is well described by the International Tokamak Physics Activities scaling law. Nevertheless at larger values (reduced plasma current at constant toroidal magnetic field), the threshold deviates significantly from the scaling law and increases with . As a consequence, a strong correlation of power threshold with transport is reported suggesting that L–H transition is more favorable for L-mode plasmas with already good confinement.