Storage technologies

While much has been written about the intelligent grid of late, little attention has been focused on the role of energy storage in achieving its expected benefits. Energy storage is an essential component of the intelligent grid. Energy storage provides greater grid integration of variable renewable energy resource output (e.g., wind, solar); improved system reliability via the provision of grid regulation services; and peak demand reductions and, in turn, deferred capital spending on new and upgraded transmission and distribution assets.

Pumped-storage technology allows utilities to defer the time value of energy, but project developers have struggled to make their economics work. Increased demand for ancillary services and standby capacity might make pumped storage more viable.

The old shibboleth to some extent is literally true. The electric industry appears different from the natural gas industry in that demand must be matched immediately with production. No viable location comes to mind to put away some of that extra power until it is needed. But literal truth is not necessarily the whole story.