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Toshiba Energy Systems & Solutions Corporation

Systems & Solutions

Renewable energy ― Geothermal power

Eco-friendly generation, using 100% domestic energy

  • Geothermal power is independent and stable natural energy • What is geothermal power? • Eco-friendly • Extensive product line-up Geothermal power is independent and stable natural energy • What is geothermal power? • Eco-friendly • Extensive product line-up
    Geothermal power is independent and stable natural energy • What is geothermal power? • Eco-friendly • Extensive product line-up
  • What is geothermal power?   Geothermal power uses a hot steam generated from rainwater that seeped underground and heated by the heat of magma to generate power.
  • Eco-friendly   Different from other natural energies, geothermal power is free from effects of seasonal and weather factors and offers stable and sustainable generation. Geothermal power does not require external fuel. Therefore, it is free from import-related factors, such as overseas economic changes and supply fluctuations, and realizes independent and stable power generation. In Addition, geothermal power is eco-friendly energy with minimal CO2 emissions.
    Eco-friendly   Different from other natural energies, geothermal power is free from effects of seasonal and weather factors and offers stable and sustainable generation. Geothermal power does not require external fuel. Therefore, it is free from import-related factors, such as overseas economic changes and supply fluctuations, and realizes independent and stable power generation. In Addition, geothermal power is eco-friendly energy with minimal CO2 emissions.
  • Extensive product line-up   Toshiba has developed various geothermal power systems and established an extensive line-up of products. In particular, our compact system Geoportable™ is available for various situations. Geoportable™ standard set
  • We offer various hydroelectric power technologies according to the given situation and purpose of use
    We realize local production and local consumption of energy through our extensive product line-up

Geothermal power is an independent and stable power generation system that utilizes the thermal energy of the Earth's magma.
In 1966, Toshiba delivered a set of 20 MW geothermal turbine and generator to Japan's first geothermal power plant, and has since supplied many geothermal power generation systems throughout the world. As of December 2016, Toshiba has delivered steam turbines for geothermal power plants for a total output of about 3.4 GW. This accounts for 23% of the world's geothermal power output in operation, the largest share in the world on an installed capacity basis.

What is geothermal power?

Renewable energy to generate power by utilizing the heat the Earth has

Renewable energy to generate power by utilizing the heat the Earth has

Geothermal power generation harnesses the thermal energy from the Earth's magma to create steam that drives the turbine and generator to generate power.
The steam flow used for geothermal power is generated by rainwater seeping underground and being heated by the magma. The amount of heat that magma produces is limitless, and rainfall is infinitely repeated, as a result of one of the Earth's atmospheric phenomena. As such, use of underground steam is a part of infinitely-repeated energy collection cycles, and geothermal therefore is renewable energy.

* A study says it takes about three billion years for the temperature of the mantle (4,000°C) to decrease by 300°C. ("Introduction to Geothermal Energy", The Geothermal Research Society of Japan)

Generation with minimal CO2 emissions and little environmental burden on the Earth

Average life cycle CO2 emissions by power source

About 30% of CO2 emissions in Japan come from power stations. In order to reduce CO2 emissions to mitigate global warming, it is desirable to adopt generation systems with less CO2 emissions such as geothermal power.

Stable and sustainable 100% domestic natural energy

Different from generation by solar power or wind power which is affected by seasonal and weather factors, geothermal power utilizing the stable thermal energy of the magma is free from seasonal and weather factors and offers stable and sustainable power generation.
Japan is a volcanic country with abundant geothermal energy. This power generation uses 100% domestic geothermal energy and is free from the effects of the economic changes abroad and the supply fluctuations associated with import of fuel resources needed for generation. It allows for independent and stable power generation.

Toshiba offers a wide range of power generation systems from 1 MW to 200 MW output to meet customer needs

Toshiba's geothermal power generation systems have the following characteristics.

  • • Super rotor technology

  • • Small-scale geothermal power generation system

Super rotor technology that solves the issues specific to geothermal turbines

Improves the reliability and performance of geothermal turbines

Long-term operation of a geothermal power plant faces some issues. One is a reduction in the output and performance due to attenuation of geothermal resources. Another is deterioration in the performance and reliability arising from aging and damaging specific to geothermal turbines because the turbines are constantly exposed to steam flows that contain corrosive substances. Super rotor technology is a collective term for Toshiba's technologies to counter such issues and improve the reliability and performance of geothermal power generation.

The photograph on the right shows a last stage blade which was used for 10 years. It clearly shows that the integrity of the blade is maintained.

Geothermal turbine last stage blade
Geothermal turbine last stage blade

Project to convert to super rotor in which Toshiba provided effective technology

More than 20 years have passed since the commercial operation began at a geothermal power station in the US to which Toshiba delivered a steam turbine and generator and a reduction in the main steam pressure and flow rate, as well as aging due to corrosion and erosion, have been observed. The geothermal steam of the power station is highly corrosive, and turbine manufacturers struggled with stress corrosion cracking (SCC). Among them, Toshiba was the only company that provided a highly effective technology that was unprecedented.
In this project, Toshiba mainly applied new design to the nozzle and rotor and replaced the parts.

After 10 years of use

For 8-10 years since then, the parts were used without maintenance or major inspections, and there has been no reduction in the performance observed. Toshiba will continue to offer solutions for various issues that geothermal power generation systems may face.

Upgrade work   Replacing with newly manufactured parts
Upgrade work Replacing with newly manufactured parts

Small scale geothermal power generation system, Geoportable™, which enables generation in a limited area site

Realizes minimization of installation footprint
- Geothermal power system that fits in an area of 250 m2 -

Even if the available area is limited, Geoportable™ may offer a generation system that meets your requirements. In one project, 2 MW-class Geoportable™ were used and the entire power generation system was fit into a 250 ㎡ area.

Geothermal power systems

Installation in a short time for early operation

Turbine, generator and other components of Geoportable™ are standardized based on an optimal skid plan that takes into account transport and on-site installation work. The equipment is assembled on a skid at a factory under rigorous quality control and shipped from the factory, which enables installation in a short time and early commercial operation. Additionally, the system employs a tubular condenser. Unlike a direct-contact condenser, a tubular condenser has no limitation in the height difference from the cooling tower and, for the Waita Geothermal Power Plant, construction work such as excavation was not necessary.

Installation in a short time for early operation

Minimal power for auxiliary equipment to realize high sending-end output

Auxiliary equipment such as condenser, cooling tower, gas extraction system, and various pumps are optimized to minimize the power required to operate them. By curbing the use of extra power, the net power output is maximized.

Waita Geothermal Power Plant with an exceptionally high availability factor

At the Waita Geothermal Power Plant, for which Toshiba supplied systems and took charge of a part of the construction work, Toshiba's 2 MW-class Geoportable™ was adopted and has contributed to the plant's high availability factor.

* Availability factor falls between December 2014 and September 2016, excluding periods of planned inspection and maintenance by the customer.

Waita Geothermal Power Plant with an exceptionally high availability factor

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