Editing Pieee (section)

==Objectives and significance==
The objective of the proposed Special Issue is to review research, development, and commercialization efforts in the areas (A) of massive storage of renewable green energy and (B) its back-conversion to grid electricity.  By “massive” we mean quantities on the order of one gigawatt‐day and up, where 1 GWd = 86.4 TJ.  We shall encourage not only papers of narrow technical focus (however important) but also ones of plentiful tutorial-style content. Given the known issues of cleanliness, safety, and sustainability with both nuclear and fossil fuels, there is a rapidly growing recognition of the importance of green and renewable energy sources.  However, the weak link of the major renewable sources is their intermittency.  The urgency of addressing and resolving this Intermittency Challenge is clear:  fossil fuels are not intermittent, but they are finite; and if their depletion is not to leave our children a world where on-demand energy is only a memory, then the enormous task of developing massive energy storage systems is urgent.  In the United States alone there is 1.1 TW of electric generating capacity, of which less than 10% is both renewable and buffered with storage; furthermore, it is hard to see how the gap could be closed with more dams.  

The proposed Special Issue will highlight this urgency; and we intend it to be a landmark resource for future workers in the area.