One of the most severe problems for fusion reactors is the power load on the divertor target plates. Technically only power loads of less than 10MW/m2 are acceptable. However, strong ELM (Edge Localized Mode) activity can lead to power loads in excess of 800MW/m2. In order to reduce the steady-state heat flux and the transient heat flux due to ELMs radiation cooling experiments were performed at JET. Nitrogen was puffed into the divertor up to a radiative power fraction of 90%. This was achieved at a density of 0.85 times the Greenwald density [1], while maintaining an H-factor of fH 98 = 0.82. The Zeff in all those discharges stayed around 2.0. At approximately 55% radiative power fraction the ELM characteristic changes from type-I to type-III, resulting in a loss of confinement of about 25% due to a degradation of the edge pedestal and hence a reduction of the ELM power load to the divertor tiles. By increasing the radiative power fraction to values of about 90% the heat flux is further reduced to 2MW/m2 although the stored energy is increasing.