I’ve still to read the article (hopefully I can find the full text somewhere) but looks like instead of batteries they’re proposing heat-based energy storage (and radical energy use reduction).
Edit:
The study you linked to actually just summarises another study (in about as many words as I did above):
Jacobson, M.Z., M.A. Delucchi, M.A. Cameron, and B.A. Frew, 2015. A low-cost solution to the grid reliability problem with 100% penetration of intermittent wind, water, and solar for all purposes, Science, in review.
Also look at this web site, which I often reference, that enables you to construct cost-minimized 100% renewable systems to supply baseload power. Some places it's cheaper than in others. Sorry, Eastern Europe and the Baltic.
I’ve still to read the article (hopefully I can find the full text somewhere) but looks like instead of batteries they’re proposing heat-based energy storage (and radical energy use reduction).
Edit:
The study you linked to actually just summarises another study (in about as many words as I did above):
Jacobson, M.Z., M.A. Delucchi, M.A. Cameron, and B.A. Frew, 2015. A low-cost solution to the grid reliability problem with 100% penetration of intermittent wind, water, and solar for all purposes, Science, in review.