Geothermal power generation is a renewable energy technology that produces electricity by using high-temperature hot water and steam heated by magma deep underground to drive a turbine. Because it is not affected by weather conditions or time of day, geothermal power can provide a stable, 24/7 supply of electricity. It is also attracting attention as a clean power source with low CO₂ emissions.
Japan has the world’s third-largest geothermal resources, following the United States and Indonesia, and geothermal power is positioned as a baseload power source.

In geothermal power generation, the geothermal reservoir plays a role similar to a boiler in a thermal power plant. Wells, called production wells, are drilled into the reservoir to extract geothermal fluid, which is then separated into steam and hot water in a separator.
The steam is used to drive a turbine and generate electricity, while the hot water is reinjected deep underground through reinjection wells. After driving the turbine, the steam is cooled and condensed in a condenser, reducing pressure and improving turbine efficiency. The warm water collected in the condenser is further cooled in a cooling tower and reused as cooling water for steam condensation.

● Mechanism of Geothermal Power Generation

When geothermal fluid has a low to medium temperature of approximately 150°C or less, the separated steam cannot directly drive a turbine. In such cases, the heat is transferred to a secondary working fluid with a lower boiling point than water—such as a water–ammonia mixture—through a heat exchanger. The vaporized working fluid is then used to drive a turbine and generate electricity. This power generation method is known as binary power generation.
Binary power generation significantly expands the potential of geothermal energy utilization, and the number of small- to medium-scale geothermal power plants using this technology has been increasing year by year.

● Mechanism of Geothermal Binary Power Generation

Geothermal energy can be used not only for power generation but also for a wide range of other applications. After hot water and steam are used for electricity generation, they can be reused step by step according to their temperature levels in secondary and tertiary applications. This approach, known as cascade use, enables the effective utilization of geothermal energy that would otherwise remain unused.

Intellect supports sustainable energy projects that maximize the potential of geothermal resources while coexisting harmoniously with local communities. From site selection to power plant operation and maintenance, we provide optimal solutions through an integrated, end-to-end service structure.

Our Services

1.Geothermal Power Consulting

We provide comprehensive consulting services from the initial stages of geothermal development.
・Site identification and coordination
・Geothermal resource assessment and feasibility analysis
・Development of business plans (financial models and schedules)
・Structuring of project schemes (business structure and partner arrangements)

2.Development Services

We support geothermal project development from the early stages through project realization.
・Assistance with permits and regulatory approvals
・Grid connection studies, consultations, and applications with electric utilities
・Support for community briefings and consensus-building with local stakeholders

3.EPC (Engineering, Procurement, and Construction)

Based on our technical expertise, we deliver optimized system design and construction.
・Basic and detailed design of geothermal power plants
・Selection and procurement of equipment and systems
・Supervision of on-site construction, installation, and commissioning

4.O&M (Operation and Maintenance)

We provide operation and maintenance services to ensure stable and reliable plant performance.
・Remote monitoring and analysis of power generation data
・Administrative procedures, statutory inspections, and routine site inspections
・On-site response, monitoring, and preparation of operational reports