Nowy Dwór Mazowiecki GT-1 Thermal Water Exploration Well: Project Overview, Funding, and Investment Potential

Nowy Dwór Mazowiecki GT,1 Thermal Water Exploration Well: Project Overview, Funding, and Investment Potential

Project background and objectives

The town of Nowy Dwór Mazowiecki signed grant agreement No. 52/2025/Wn07/FG,hg,dg on 20 February 2025 with the National Fund for Environmental Protection and Water Management (NFOŚiGW) under the “Making Poland’s Thermal Waters Accessible” priority program. The grant fully funds the execution of a single exploration and appraisal borehole, Nowy Dwór Mazowiecki GT,1, aimed at locating and characterizing geothermal waters for heating, recreational and balneotherapy uses.

The direct objective is to perform geological works to identify and appraise thermal water resources and to make them available for municipal and commercial uses. The drilling target is one borehole to a design depth of 2,070 m (±10%). The project’s declared operational target is to assess thermal water yield and temperature to determine suitability for district heating, spa, recreational use, or other local applications. 

Funding, contract awards and schedule

The total project budget is PLN 12,923,873.00, covered by a grant from NFOŚiGW. On 19 August 2025 the municipality awarded the drilling contract to UOS Drilling S.A., with a contract value of PLN 15,517,523.79 and a contractual completion date of 19 February 2027. Contract supervision and geological oversight are provided by Multiconsult Polska Sp. z o.o. under a separate agreement dated 30 April 2025, valued at PLN 383,760.00. 

Pre construction and preparatory works ran from August 2025; drilling works began in July 2026 at the Zakład Energetyki Cieplnej (District Heating Plant) site on Przemysłowa Street. The project’s material completion milestone for delivering geological documentation and the borehole is set for 31 July 2027. 

Technical scope and key performance targets

- Number of boreholes: 1 (exploration/appraisal).

- Design depth: 2,070 m (±10%).

- Target flow rate: approximately 250 m3/h.

- Target outflow temperature: minimum 50°C.

- Deliverables: geological documentation and well testing results.

The primary technical aim is to secure thermal water for district heating at scale. If flow rate or temperature fall short of heating requirements, municipal decision makers may pivot to recreational or balneotherapy utilization, or opt to decommission the well. 

Site selection and drilling context

The drilling location within the district heating plant area minimizes pipeline lengths and integration costs if waters are suitable for municipal heat supply. Locating the borehole inside the existing energy plant also reduces land acquisition complexity and leverages existing infrastructure for heat exchange, reinjection feasibility, and operations management.

Drilling to deep geothermal targets, around 2 km, presents known geological and operational risks, variable lithology, possible over pressured zones, scaling and corrosion potential in produced fluids, and uncertainty in reservoir transmissivity. Effective geotechnical and hydrogeological studies plus continuous geological logging are essential to manage risk and optimise hydraulic testing.

Expected uses and local benefits

Primary potential uses:

- District heating: a successful well producing ~250 m3/h at ≥50°C could significantly reduce fossil fuel consumption for municipal heat, lower operating costs, and cut CO2 emissions.

- Recreational and balneotherapy facilities: if thermal water volume or temperature is lower, the resource could supply spas, pools, and medical, recreational uses that create local tourism and health service revenue.

- Industrial uses: depending on chemistry and availability, thermal waters can serve industrial processes or greenhouse heating, less likely but possible.

Local economic and social benefits include job creation during drilling and construction, reduced municipal energy bills, diversification of the local energy mix, improved air quality from lower combustion emissions, and potential tourism growth tied to spa facilities. 

Technical and commercial risks

- Resource risk: actual flow and temperature may not meet design targets. Geological uncertainty is high for single well exploration.

- Financial risk: the drilling contract value exceeds the grant amount, so the municipality needs to manage budget differences and potential cost overruns.

- Operational risk: corrosion, scaling, and reservoir management issues can raise operating costs and require additional treatment or remediation measures.

- Regulatory, permitting: environmental assessments, water management permits, and waste handling must remain compliant to avoid delays.

- Market risk: conversion to district heating requires integration planning; lack of sufficient local heat demand or network capacity could limit commercial viability.

Monitoring, oversight and best practices

Contracted supervision by Multiconsult Polska covers investor oversight and geological supervision, critical for:

- Continuous logging, geophysical, lithological, mud logs.

- Core sampling and laboratory analysis, temperature, chemistry, scaling potential.

- Step rate and injectivity tests to estimate transmissivity and sustainable drawdown.

- Environmental monitoring, surface impacts, reinjection feasibility.

- Health and safety, and compliance with Polish and EU regulations.

Best practices to reduce uncertainty:

Use of slimhole logs and downhole sensors to characterize reservoir properties during drilling.

- Perform extended flow testing where possible to estimate sustainable yields and thermal drawdown.

- Conduct geochemical fingerprinting to anticipate scaling and corrosion and design treatment systems.

- Plan reinjection from the start to manage reservoir pressure and mitigate surface disposal.

Integration with municipal heating and economic case

A thermal well producing ~250 m3/h at ≥50°C can deliver substantial thermal power. Rough estimate: thermal power (MWth) can be approximated from flow and temperature differential; for preliminary scoping use a reasonable temperature lift to the district heating network, for example supply and return assumptions. Detailed feasibility should calculate net usable heat after heat exchangers, parasitic loads, and distribution losses.

Economic considerations:

- CapEx: drilling, well completion, surface facilities, heat exchangers, piping to network points.

- OpEx: pumping, treatment, maintenance, possible scaling remediation.

- Revenue, savings: displaced fuel costs, avoided CO2 penalties, potential sale or service fees for recreational facilities.

- Financing: combination of grants, municipal budgets, commercial loans, or energy service company, ESCO, models could finance construction and operation.

Environmental and regulatory impacts

The project benefits include potential reductions in greenhouse gas emissions and local air pollutants by replacing fossil fuels in heat generation. Environmental risks include drilling waste management, temporary site disturbance, and induced changes to subsurface hydrogeology. Compliance with environmental permits and NFOŚiGW reporting requirements is required.

Reinjection planning reduces thermal depletion and protects shallow aquifers. Water chemistry analysis must confirm compatibility with reinjection formations and surface discharge rules if any.

Next steps and recommendations for stakeholders

For municipal leaders and investors:

- Fund and prioritise detailed feasibility that includes full thermal hydraulic modelling, economic sensitivity analyses, and integration studies with the district heating system.

- Secure contingency funding to cover the difference between grant sum and contract value and potential overruns.

- Plan early community engagement, especially if alternative uses, spa, tourism, are considered.

For technical teams:

- Execute comprehensive logging and extended flow testing; conclude a decision tree for use cases, heating vs recreational vs decommission.

- Prepare a water treatment and reinjection strategy based on chemical analysis.

- Assess opportunities for phased development, initial pilot connection to a small heat load to validate performance before full network integration.

Investment outlook and strategic significance

Poland’s national program to open access to thermal waters aligns with broader EU decarbonization goals and can unlock locally distributed, low carbon heat resources. For investors, municipal geothermal projects present a mixed risk, return profile: high upfront exploration risk but stable low cost heat supply if successful. Strategic value includes energy security, reduced exposure to volatile fuel prices, and potential revenue from spa and tourism development if direct heating isn’t feasible.

 Conclusion

Nowy Dwór Mazowiecki GT,1 is a single well, grant funded exploration project with clear municipal targets: identify whether deep geothermal water can supply district heating at scale, approx. 250 m3/h at ≥50°C. The project is well structured with NFOŚiGW financing, an experienced drilling contractor, and independent technical supervision. Key uncertainties remain geological; success will depend on drill results, hydraulic testing, and viable integration planning. If successful, the project could create substantial environmental, social, and economic value for Nowy Dwór Mazowiecki and serve as a model for municipal geothermal development in Poland.

 Source: Zadania