Speicherung von Sonnenschein

On a side visit during a reporting assignment, I got to visit Germany's equivalent of NASA, DLR (Deutsches Zentrum für Luft- und Raumfahrt, in case you were wondering). 

One of the big projects researchers there are working on is storing solar thermal energy. Instead of keeping electrons on tap, holding on to heat might prove more efficient and cost-effective for solar power generation.