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Storing Energy

Power generation technologies for mitigating climate change

In order to ensure a stable power supply when large amounts of renewable energy, such as photovoltaic and wind power, are introduced, we are developing and providing diverse storage battery solutions and hydrogen power storage systems.

Stationary storage battery systems, an important trump card for spreading renewable energy

Power generation that uses wind, sunlight, and other renewable energy sources instead of fossil fuels is attracting public attention as a means of mitigating climate change and is actively being introduced in Japan as well as overseas, especially in Europe. However, the amount of power generated by renewable energy varies with the weather, so generating power with renewable energy is an unstable power generation method. Expanding the use of this method requires controlling sharp output fluctuations and achieving load leveling through peak shifts by charging batteries at night when demand is low and discharging electricity during the day when demand peaks.

Control of output fluctuations
[Image] Control of output fluctuations

Peak shifting
[Image] Peak shifting

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Stationary storage battery systems to contribute to a stable power supply

[Image] Stationary storage battery
Stationary storage battery

The stationary storage battery system proposed by Toshiba Group uses Toshiba's high-performance SCiB™ lithium batteries as modules. These batteries' major characteristic is that lithium titanate (LTO), a safe battery material, reduces the risk of smoke and fire generation to the minimum, thereby ensuring a high level of safety. In addition, SCiB™ lithium batteries do not degrade even after more than 15,000 charge-discharge cycles, providing a long product life. Therefore, their input-output properties are stable over a wide range of capacities and facilitate charging and discharging from 0% to 100%, which can reduce the number of batteries needed for systems and thus contribute to downsizing.

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Hydrogen-based autonomous energy supply system using hydrogen power storage technology

Hydrogen is expected to serve as a major secondary energy source in the future due to the following advantages it offers in terms of energy policy: (1) hydrogen may greatly reduce energy consumption by facilitating use of fuel cells that can achieve high energy efficiency; (2) hydrogen, which can be produced from a variety of energy sources by various methods, may improve energy security; (3) in addition to generating no CO2 emissions during use, the use of renewable energy-derived hydrogen can also reduce environmental impacts. Therefore, the Japanese government is promoting the use of hydrogen through industry-university-government collaboration as one of its energy-related projects.

In 2015, Toshiba Group commercialized H2One™, a hydrogen-based autonomous energy supply system, by combining a hydrogen power storage technology employing water electrolysis with fuel cell power generation technology. This system can achieve CO2-emissions-free power generation by using sunlight and wind power in combination as well as store power in the form of hydrogen for a long period of time. Therefore, it is expected to be used for local consumption of locally produced energy and also in emergencies as a system that enables self-sufficient supply of electricity and hot water without relying on system power sources.

H2One™structural diagram

Toshiba Group has delivered H2One™ units to Kawasaki City, Huis Ten Bosch, and the Yokohama Port and Harbor Bureau to ensure a stable supply of electricity and hot water throughout the year. Huis Ten Bosch stores surplus photovoltaic power as hydrogen from summer to autumn and makes up for shortages in photovoltaic power output by using up hydrogen from autumn to winter in order to properly manage its power supply system. (See the figure below.)

[Image] Power supply using H2One(TM) (Huis Ten Bosch)
Power supply using H2One™ (Huis Ten Bosch)

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