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Three Steps From Hot Rock to Clean Power

A geothermal project sounds complex. The principle is not. We drill into hot rock, circulate a working fluid in a closed loop, and convert that heat at surface - into electricity, building cooling, industrial heat, or all three at once.

The Three-Step Process

Drill - Circulate - Convert

Modern geothermal is a closed-loop heat-mining process. We do not consume the rock. We do not consume the water. We extract heat - and return the cooled fluid to the same reservoir to be reheated. The same volume cycles for decades.

Step 01 · Subsurface Access
Drill
Two wells are drilled - typically 1.5 to 3.5 km deep - into a geothermal reservoir. One is the injection well, one is the production well. Modern slimhole and directional drilling let us reach hot rock with a small surface footprint.
Slimhole Directional 1.5–3.5 km Small Pad
Step 02 · Closed Loop
Circulate Heat
A working fluid - water or brine - is pumped down the injection well, travels through the hot reservoir absorbing heat, and rises up the production well at 120–200°C+. The same fluid cycles back, sealed from the environment.
Closed Loop 120–200°C+ Reinjection Sustainable
Step 03 · Surface Output
Convert to Power & Cooling
At surface, the heat drives a Binary / ORC turbine to generate electricity 24/7. Residual heat feeds an absorption chiller that produces chilled water for building cooling. Lower-grade heat goes on to drying, agriculture, and tourism - cascade use.
ORC Absorption Chiller District Cooling Cascade
Cascade Use

One Resource. Many Outputs. Maximum Value.

A geothermal well does not give up its heat in one shot. As the working fluid cools, each temperature band has a useful job. RT designs every project as a cascade - so a single hot-spring system pays back as electricity, then cooling, then drying, then tourism.

200°C+
Power Generation
Binary / ORC turbine drives clean baseload electricity to the grid or PPA off-taker.
90–150°C
Buildings Cooling
Absorption chillers convert mid-grade heat into chilled water for buildings & data centers.
60–90°C
Drying & Industrial Heat
Process heat for agricultural drying, food processing, and light industrial use.
35–60°C
Spa & Tourism
Low-grade heat feeds spa, resort, and community wellness - closing the value chain.
3–20 MWe - Power for District Cooling & General Use
District Cooling
24/7 baseload supply for district cooling networks and general-use demand.
Technology Stack

Off-the-Shelf, Field-Proven Components

Each block in our process is mature and bankable. RT's role is integrating them into a Thai-context geothermal cascade - and de-risking the subsurface side with the drilling and reservoir DNA we already have in-house.

01 / 06
01
CORE TECH 01 - Energy

Binary Cycle / ORC

Organic Rankine Cycle turbines convert moderate-temperature geothermal heat (120–200°C) into electricity using a low-boiling-point working fluid. Ideal for Thai resources.

90%+
Capacity Factor
02
CORE TECH 02 - Cooling

Absorption Chiller

Heat-driven chillers (LiBr or NH₃) replace conventional electric chillers. Geothermal feed delivers chilled water for HVAC, building cooling, and data center loops - at a fraction of the grid load.

−45%
vs conventional cooling load
03
CORE TECH 03 - Drilling

Slimhole & Directional Drilling

Decades of Thai oil & gas drilling experience translate directly. Slimhole rigs lower exploration risk and cost; directional drilling lets us hit the reservoir from a small, community-friendly surface pad.

3.5 km
max drilling depth
04
CORE TECH 04 - Geology

Reservoir Modeling (3D)

Geological mapping, geophysical surveys, and 3D reservoir simulation define where to drill, how much fluid to circulate, and how the field will perform across decades - before any rig moves.

3D Sim
Geo + Geophys + Reservoir
05
CORE TECH 05 - Sustainability

Reinjection & Sustainability

Cooled fluid is returned to the reservoir through the injection well. Pressure is maintained, the resource is preserved, and there is no net consumption of groundwater - geothermal stays sustainable across project life.

25+
years field lifecycle
06
CORE TECH 06 - Carbon

Digital MRV & Carbon

Each MWh and each ton of CO₂ avoided is logged with Digital MRV - making outputs auditable for green PPA, carbon credits, and ESG reporting from day one.

MRV
Auditable MWh + tCO₂
Common Questions

What People Always Ask First

Geothermal is unfamiliar to many decision-makers in Thailand. These are the questions we answer most often - directly, without jargon.

Doesn't Thailand lack volcanoes? Can geothermal even work here?
Volcanic systems are not required. Thailand has documented hot-spring belts and granite-hosted reservoirs that store heat at commercially useful temperatures. The Fang plant produced geothermal power as early as 1989 - the resource is real, the technology has just caught up.
Does it use up groundwater?
No. The working fluid runs in a closed loop and is reinjected into the same reservoir. There is no net consumption of groundwater - the resource is preserved across the project life, typically 25+ years.
How does this give us cooling, not just electricity?
Heat from the production well drives an absorption chiller - a heat-powered cooling unit. It produces chilled water for HVAC and building cooling using almost no grid electricity. That is how a geothermal project can cut a building's cooling load by up to 45%.
Is it bankable? What does the revenue model look like?
Yes. Revenue stacks across PPA (electricity), Cooling-as-a-Service (CaaS), and industrial heat - plus carbon credits from Digital MRV. ESCO structures let clients pay zero upfront and only for energy delivered, below current tariff.
What about earthquakes or induced seismicity?
Thai geothermal targets are conventional hydrothermal reservoirs, not deep EGS fracturing. Reinjection is pressure-managed and continuously monitored. Best-practice protocols from international operators are built into every drilling and operating plan.
How long until I see results from a pilot?
Visible impact within 12 months from pilot sanction. Cascade cooling and small-scale ORC modules deploy faster than utility-scale power plants - and their performance feeds directly into scaling decisions for the next module.
Ready to Go Deeper

Bring a Cascade to Your Site

Whether you operate a data center, an industrial estate, a hospital, or a hotel cluster - RTG's team can model the geothermal cascade that fits your load profile.

Talk to RTG ← Why Now