Abstract. JET has achieved discharges that meet the ITER requirements ( q95, Zeff, < ne > /nGW, H98, etc.) in Type I ELMy H-modes at high triangularities. One of the problems for the full extrapolability of these discharges to ITER is the transient energy loads onto the divertor target associated with Type I ELMs that may lead to a limitation of the ITER target lifetime. Type I ELM energy losses decrease with increasing pedestal density and decreasing pedestal temperature, for a wide range of JET ELMy H-mode plasmas. The normalised ELM energy losses (DWELM/Wped) are well correlated with the pedestal plasma collisionality ( ). The reduction of DWELM/Wped with increasing is mostly due to the reduction of the temperature drop that the ELM causes (i.e., conductive losses). ELM particle losses (leading to convective losses) seem to be independent of . Pure convective Type I ELMs have been observed in JET with a normalised energy loss of 0.05, which is within the acceptable values estimated for ITER ( 0.07). On the basis of the JET ELM results, the implications for the expected ELM size and its convective/conductive nature in ITER will be described.