The Renewable Energy Sources Act or EEG (: Erneuerbare-Energien-Gesetz) is a series of laws that originally provided a (FIT) scheme to encourage the generation of . The EEG 2014 specified the transition to an system for most technologies which has been finished with the current version EEG 2017.
[pdf] Just as PV systems can be installed in small-to-medium-sized installations to serve residential and commercial buildings, so too can energy storage systems—often in the form of lithium-ion batteries. NREL researchers study the benefits of such systems to property owners, their impact on the electric grid, and the effects on. .
Energy storage has become an increasingly common component of utility-scale solar energy systems in the United States Much of NREL's. .
The Storage Futures Studyconsidered when and where a range of storage technologies are cost-competitive, depending on how they're operated and what services they provide.
[pdf] 
