If Europe is serious about reaching its target to keep global mean temperature increase below 2 degrees C, it must strive for a 100% renewable  electricity system by 2050. The SuperSmart Grid approach combines what is often perceived as two exclusive alternatives: wide area power generation and decentralised power generation. We argue that by combining these, in fact, complementary measures, it is possible to address the crucial issue of  renewable generation-fluctuating supply-in a comprehensive as well as in a technologically and economically viable manner. Thus, the SuperSmart Grid  simultaneously can contribute to energy security, climate security, social security, and national security.