Editing Pumped-storage hydroelectricity (section)

=== Small-scale facilities ===
Smaller pumped storage plants cannot achieve the same [[economies of scale]] as larger ones, but some do exist, including a recent 13&nbsp;MW project in Germany. Shell Energy has proposed a 5&nbsp;MW project in Washington State. Some have proposed small pumped storage plants in buildings, although these are not yet economical.<ref name=":0">{{Cite journal |last1=de Oliveira e Silva |first1=Guilherme |title=Pumped hydro energy storage in buildings |last2=Hendrick |first2=Patrick |date=2016-10-01 |journal=Applied Energy |volume=179 |pages=1242–1250 |doi=10.1016/j.apenergy.2016.07.046|bibcode=2016ApEn..179.1242D }}</ref> Also, it is difficult to fit large reservoirs into the urban landscape (and the fluctuating water level may make them unsuitable for recreational use).<ref name=":0" /> Nevertheless, some authors defend the technological simplicity and security of water supply as important [[Externality|externalities]].<ref name=":0" />