The underlying question of this research work is whether small, distributed storage devices on the electricity grid can help to lower the average electricity cost and foster the integration of renewable energy sources. This article addresses the question whether it is economically beneficial to install such storage capacity. The article presents two models that estimate the economic benefits from using electrical storage devices for arbitrage accommodation at an end consumer level and assumes flexible electricity tariffs. The models reveal a saving potential between 9% and 15% on total cost, based on technical specifications of storage devices in a developmental stage.