**7. Economic aspects of energy storage**

Market integration means the process of step-by-step harmonizing of the rules of the various power markets, culminating in the harmonization of all cross-border

market rules that allows electricity to respond to price signals and flow freely across borders (as do goods and services in the internal market).

As several aspects of the evolving modern energy economy, the greatest results come from the cooperation of bringing components mentioned above together in an actively and carefully built system that consists of: dispersed renewable energy generation, scalable baseload infrastructure, smart grid, demand response, and rapid energy storage response [51]. Markets integrate into regional markets for cross border trade of electricity and its continuously increasing.

A reinforced, interconnected European network requires coupled markets, versatile production, increased backup and storage capability, demand response measures, clear worth signals, responsiveness of support, and cost-effectiveness to balance the fluctuation of energy sources across Europe [52]. These are the aspects that help to improve the functioning of the electricity system and financial market [53].
