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Allstream Insiders Summary

Sage Geosystems has placed its SMECI enhanced-geothermal facility in South Texas in service and, one week later, signed a memorandum of understanding with Chiyoda Corporation for a commercial-scale surface-facilities feasibility study. Together, the announcements cover two different parts of Sage’s development effort: company-reported subsurface operating results and engineering evaluation of the high-pressure equipment required above ground.

Sage said the SMECI facility has operated for more than 120 days since selling its first electricity during the second quarter of 2026. The operating campaign evaluated subsurface pressure response, injection and production performance, water management, system efficiency and reservoir behavior.

According to Sage, water losses remained below 10% across multiple cycles, and its GeoTwin modeling tool anticipated the operating behavior observed in the field. Sage said it is using the results to inform future projects, including its pilot with Ormat in Nevada, while continuing to operate SMECI for further optimization.

Ormat reported separately on August 5 that it had selected a Nevada power plant for the Sage pilot, advanced permitting, neared completion of procurement for drilling services and equipment, and progressed engineering to integrate a two-well EGS facility into the selected plant.

Under the separate Chiyoda MOU announced August 26, Sage will provide wellhead pressure and temperature conditions, fluid properties and operating conditions for a technical and commercial feasibility study. Chiyoda will evaluate major equipment configuration, power and energy balances, indicative capital and operating costs, and power-generation cost for high-pressure surface facilities.

The announcements do not state that Chiyoda is designing the SMECI facility or that its study is based specifically on SMECI data. They also do not announce a final investment decision, construction authorization, commercial plant budget, capacity or EPC award.

Sage EGS Development Tracker

What Did Sage Report from the SMECI Facility?

Sage describes SMECI as a field proof point for its proprietary enhanced geothermal systems approach, supported by a multi-month operating campaign. The company said the results met or exceeded its objectives and demonstrated repeatable reservoir behavior intended to support greater net power output.

Sage highlighted three principal findings:

• Repeatability: More than 120 days of operations produced results that Sage described as consistent across operating cycles.
• Water management: Water losses were reported at less than 10% across multiple cycles, meaning most of the injected water remained within the system.
• Predictive modeling: Sage said its GeoTwin model anticipated the subsurface operating behavior later observed in the field.

These are Sage’s reported operating results. The announcement does not provide SMECI’s generating capacity, total construction cost or a third-party technical validation of the performance data.

How Does Sage’s EGS Approach Work?

Sage’s approach injects water into an engineered underground reservoir in hot rock and uses both subsurface heat and pressure energy stored in the reservoir. The system is designed to preserve pressure, reduce water and energy losses and produce water through controlled cycles for energy recovery at the surface.

Sage is advancing the technology for two related applications:

• Continuous geothermal power generation
• Long-duration energy storage that uses surplus electricity to store pressure energy underground for later recovery as demand changes

The system applies drilling, well-construction and subsurface-reservoir-management techniques developed in the oil and gas industry. This gives the technology a direct connection to upstream drilling and reservoir expertise, even though the combined article remains best suited to the Renewable Energy category.

What Will Chiyoda Evaluate?

Chiyoda’s feasibility study is focused on the high-pressure surface facilities required to recover energy from the fluid produced by Sage’s wells. Sage will provide the wellhead and operating assumptions, and Chiyoda will evaluate:

• Major equipment configuration
• Power and energy balances
• Indicative capital costs
• Indicative operating costs
• Power-generation cost

The work is described as a technical and commercial feasibility study under an MOU. The companies have not characterized it as front-end engineering and design, detailed engineering, an EPC contract or authorization to construct a commercial facility.

The initiative has been selected for support under the Tokyo Metropolitan Government’s TIB CATAPULT program, which is promoted through Plug and Play Japan. Chiyoda and Sage said they will continue evaluating the technical and business requirements for commercial deployment.

How Do the Two Announcements Fit Together?

The SMECI operating campaign and Chiyoda study address complementary development questions, but the companies announced them as separate activities. SMECI provides company-reported information about how Sage’s engineered reservoir behaves during injection and production cycles. Chiyoda’s assignment concerns the configuration and economics of the high-pressure surface facilities needed to recover energy from produced fluid.

Allstream views the sequence as a progression from subsurface field testing toward commercial-scale system evaluation. That interpretation does not establish that Chiyoda is designing the SMECI site, that SMECI is the commercial project covered by the study or that a larger plant has reached final investment decision.

Sage said it is applying SMECI results to future project designs, including the Ormat pilot in Nevada. Ormat’s August 5 update said a power plant had been selected, permitting had advanced, procurement for drilling services and equipment was nearing completion, and engineering was progressing for integration of a two-well EGS facility. Ormat did not provide the pilot’s generating capacity, capital budget or drilling schedule in that update.

Could the Technology Support Data Centers and Industrial Loads?

Sage and Chiyoda identify data centers, industrial facilities, community microgrids and critical infrastructure as potential users of stable geothermal power. Geothermal generation is less affected by weather and time of day than solar and wind generation, making continuous output potentially relevant to customers with high reliability requirements.

Those are potential markets identified by the companies. The two announcements do not name a data-center operator, industrial customer, power-purchase agreement or committed electric load associated with SMECI or the Chiyoda study.

What Could the Milestones Mean for the Industrial Supply Chain?

The confirmed work consists of continuing SMECI operations and Chiyoda’s feasibility analysis; the releases do not announce commercial-project procurement. If Sage advances larger developments, the two milestones could inform future requirements across subsurface and surface scopes.

The work areas directly supported by the announcements include:

• Drilling, well construction and engineered-reservoir management
• Injection and production performance analysis
• Subsurface pressure monitoring and predictive modeling
• Water-management and system-efficiency optimization
• High-pressure surface-facility engineering
• Produced-fluid energy recovery
• Major-equipment configuration and energy-balance analysis
• Capital-cost, operating-cost and power-generation-cost modeling

These areas describe the technology and study scope. They are not public bid packages, vendor selections or construction awards.

Allstream Perspective

The combined announcements give Sage a more complete scale-up narrative than either release provides alone. SMECI offers company-reported field evidence for reservoir repeatability, water management and predictive modeling. The Chiyoda study addresses whether a larger high-pressure surface system can be configured and evaluated on a commercial basis.

The distinction between validation and commercialization remains important. Sage has placed SMECI in service and sold electricity, but the release does not identify the facility as a full commercial-scale plant. Chiyoda has an announced feasibility-study role, not a construction contract.

The next decision-useful disclosures would include completion of the Chiyoda study, quantified performance and capacity for a named commercial project, preliminary or front-end engineering, a disclosed capital estimate, customer agreements and a formal development decision.