Energozapas gravitational power engineering

Global
Trends

These days, energy storages are one of the leading trends of power engineering. The world leaders in energy production keep increasing energy storage capacities.

According to Navigant Research, Japan, the USA, and China are current world leaders in the application of grid-scale energy storages. Annual investments into building of energy storages have exceeded 10 billion USD.

Geographic distribution of installed energy storage capacities

Plot
*according to the Sandia Laboratory, US Department of Energy

Energy storages as a way of grid optimization

How are storages used in modern grids, and why have they become one of the key factors of grids development?

1.
Development of renewable energy sources (RES)

Power engineering industry of developed countries shows an increasing trend of switching to RES. However, renewable energy sources are still highly weather-dependent. At this point, an energy storage system can be very useful: it can accumulate RES energy when the demand is low and give it away when the demand is high.

2.
Effective use of thermal power plants (TPP)

Obsolete TPP facilities are replaced with energy storages. Facilities that are still in use will operate at constant power, which will ensure minimum wear and maximum efficiency. Such a strategy can cut the annual repair cost, increase the return on assets, and reduce environmentally harmful emissions.

3.
Construction of new nuclear power plants (NPP)

As NPP facilities operate at constant power, the construction of new power plants requires interregional flows increase. Energy storages make it possible to save the excessive NPP energy and release it when needed thereby reducing the required amount of interregional traffic.

4.
Electrical grid reliability

Energy storages lower the failure rate balancing the load on power plant equipment. Moreover, they can be an alternative to the hot-standby condition maintained at TTP facilities, which will reduce the fuel consumption rate.

5.
Reduction of grid maintenance costs

Industrial production expansion causes power surges that overload electric power substations. Use of energy storages can smooth the peak demands significantly reducing the overload.

6.
Creating a bridge to connect independent electrical grids

An energy storage can be used to accumulate electricity in one grid during off-peak hours and to deliver it to another grid when it is needed.

As of today, Pumped Hydro Storages (PHS) dominate in the market of  energy storage systems.

In the PHS, the energy is consumed to pump water from the lower basin to the higher basin and is released when water flows to the lower basin under gravity.

98%
of world’s power coming from energy storages accrue to PHS plants
1.6%
of world’s PHS power is produced in Russia

However, PHS technology has its limitations. Construction of a cost-effective PHS requires:

There is no way PHS plants can cover domestic demand for energy storage systems. We have made it our goal to develop a solution free from geographical limitations typical for the PHS technology while preserving its advantages.