Geothermal Power Plants

Control Systems

Geothermal energy takes the form of high temperature water and steam that comes from deep within the earth where it has been heated by magma. This is a highly efficient source of ecologically friendly energy. Mitsubishi Power applies the latest technology for both geothermal electric power generation and effective protection of the environment.

Geothermal electric power generation does not use any fossil fuel. The necessary heat energy can be obtained and used for power generation without any increase in CO2. Mitsubishi Power has recently made several advances in the geothermal electric power generation technology it has been developed over many years, and this technology is currently helping to provide clean electric power in countries all over the world.

DIASYS has been successfully installed as a control and monitoring system in many geothermal power plants.



A vast product lineup, for the flexibility to offer optimum systems ranging from large-scale to mid- and small-scale

Our full hardware product lineup can offer a wide range of solutions from compact systems to large-scale systems. DIASYS provides large-size controllers (MPS: Multiple Process Station) and small-size controllers (CPS: Compact Process Station). A distributed system can be designed and offered based on its use and scale with the optimum balance between cost and performance. For geothermal power plants, DIASYS offers control and monitoring functions for steam turbines and their auxiliary facilities.

High reliability and easy maintenance

DIASYS maintains high system reliability by having redundancy for its CPU data processing module, network modules, and power unit. Furthermore, the CPU module has a substantial self-diagnostic function. In case of failure, the system switches to the backup modules without any disruptions in system control. Additionally, the root cause of the issue is displayed to aid in taking prompt corrective action.

Designed for ease of engineering in control logic, system construction and system expansion

You can change and create control operation logic, create a system diagram or control loop displayed on an operator station, and add to or change the hardware configuration by using the maintenance tools specifically designed for DIASYS. This maintenance data is centrally managed through an integrated database to allow efficient engineering.

Windows-based human-machine interface with superb operability and rich functionality

Operator stations are easy to operate and use because they use the Microsoft Windows operating system to operate and monitor processes and to manage data. Operator stations provide a variety of functions to support operation, control, and monitoring of a plant. These functions include displaying plant system diagrams, trend graphs, control loop plates, and alarm events as well as logic monitoring.

Supports communication interfaces for connecting with systems from various vendors

DIASYS supports a variety of communication protocols such as ModbusTCP/IP, OPC (OLE for Process Control), and DNP3.0. This allows DIASYS to connect to and communicate with systems from other vendors.

  • Seawater Desalination Plants-01.png
  • Seawater Desalination Plants-02.png

Support for diverse operation-assisting functions, performance calculations, and stress calculations with the outstanding quality available only from a plant manufacturer

DIASYS provides a wide variety of optional products based on Mitsubishi Power' know-how as a leading plant manufacturer. These optional products include various operation-assisting functions, performance and stress calculation functions, and a training simulator. For details, visit the following optional products page: