SI Europe Updated 2026-08-20

Slovenia Geothermal Screening

Geothermal screening assessment identifies 21.8% prospective land reaching 185°C by 5.5 km depth in Slovenia.

Key Geothermal Metrics

Land Reaching 185°C by 5.5 km Moderate
21.8%

Primary baseline screening criterion

Shallowest Depth to 200°C Shallow
4.5 km

Minimum drill depth for high enthalpy

Peak Temperature at 5 km Depth Commercial EGS
215.3 °C

Maximum modeled temperature

Typical Geothermal Gradient Elevated
41.8 °C/km

Average to 5 km depth (15°C surface)

Grid Connectable Prospective Area High Accessibility
83.3%

Hot territory within 50 km transmission

Stored Heat In-Place (3–7 km) 1 ZJ = 10²¹ Joules
30.8 ZJ

Thermal volume in place (>80°C baseline)

Depth vs. Temperature Matrix (% Land Area)

Proportion of national territory exceeding target isotherm at specified depth

0.1° Inversion Grid
Isotherm 3.0 km 4.0 km 5.0 km 6.0 km 7.0 km 8.0 km
150°C 3.9% 10.6% 15.1% 19% 29.3% 34%
175°C 3.9% 8.5% 12.5% 15.3% 21.3% 24.1%
200°C 2% 4.7% 8.9% 11.4% 15.1% 18.7%
225°C 1.9% 3.2% 5.2% 7.5% 8.5% 11.6%
250°C 0.5% 1.1% 2.1% 2.5% 3.6% 4.7%

4-Stage Geothermal Resource & Infrastructure Funnel

Progressive screening from gross national territory down to grid-connected & populated prospective zones

1 Whole country
20 273 km² 100%
2 Reaches 185°C by 5.5 km
4 420 km² 21.8%
3 ...and within 50 km transmission
3 682 km² 18.2%
4 ...and within 100 km town
3 338 km² 15.7%

Geological Setting & Subsurface Parameters

Lithology, basement thickness, stress and thermal boundary constraints

Median Depth to 200°C Isotherm 6.9 km
Best 10th Percentile Depth to 200°C 5.1 km
Median Temperature at 5 km Depth 166.6 °C
Best 10th Percentile Temp at 5 km 196.5 °C
Median Sediment Thickness 1 km
Sediment / Hard-Rock Well Share 26.8%
Territory Under 1 km Sediment Cover 69.5%
Lithostatic Pressure at 5 km Depth 132.8 MPa
Moho Crustal Discontinuity Depth 33.4 km
Thermal Lithosphere Thickness 87.2 km
Curie Temperature Isotherm Depth 25.2 km
Model Temperature Spread Uncertainty (200°C) ±1.5 km

Transmission Grid & Demand Colocation

Infrastructure interconnectivity and urban power demand proximity

High-Voltage Transmission Network Length 4 612 km
Land Area Within 25 km of Grid 68.3%
Land Area Within 50 km of Grid 83.3%
Land Area Within 100 km of Grid 97.9%
Average Proximity to Nearest Substation / Line 12.5 km
Urban Centers (>10,000 Population) 52
Total Urban Population 6.5 M
Prospective Resource Colocated Near Demand (>1M Pop) 64.2%

Target Sensitivity & Deep EGS Upside

Sensitivity of prospective resource area to adjusted depth and temperature thresholds

150°C Baseline at 5.5 km 34.9% of national territory reaches 150°C at 5.5 km depth
185°C Baseline at 7.5 km 39.2% of national territory reaches 185°C at 7.5 km depth

Global Peer Benchmarking (vs. 278 Assessed Jurisdictions)

Relative ranking distribution of Slovenia across 11 standardized geothermal indicators

Slovenia Rank Global Peer Spread
Shallowest 200°C depth
4.5 km Middle 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 50th percentile
Peak temp at 5 km
215.3 °C Lower 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 46th percentile
Prospective land area (>185°C at 5.5 km)
21.8% Lower 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 36th percentile
Stored heat in-place (3-7 km)
30.8 ZJ Lower 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 47th percentile
Typical geothermal gradient
41.8 °C/km Middle 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 60th percentile
Grid proximity (<50 km)
83.3% Top 25%
P0 (Lowest) P50 (Median) P100 (Highest) • 83th percentile
Thin sediment coverage (<1 km)
69.5% Middle 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 70th percentile
Curie isotherm depth
25.2 km Lower 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 45th percentile
Moho crustal thickness
33.4 km Lower 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 40th percentile
Model temperature uncertainty spread
±0.9 km Middle 50%
P0 (Lowest) P50 (Median) P100 (Highest) • 68th percentile
Urban demand colocation
32.2% Top 25%
P0 (Lowest) P50 (Median) P100 (Highest) • 89th percentile
Asset-Level 3D Simulation Available

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Analytical Geothermal Assessment & Discussion: Slovenia

Subsurface thermal interpretation, model uncertainty, infrastructure colocation, and resource quality analysis

Resource Overview

Geothermal assessment for Slovenia indicates extensional_basin geological controls governing subsurface heat transport, yielding 21.8% of land area reaching the baseline target of 185°C at 5.5 km depth.

Uncertainty & Model Variance

Thermal inversion across Slovenia shows consistent model convergence with constrained standard deviations across deep crustal layers.

Grid & Infrastructure Colocation

National electrical transmission coverage positions approximately 83.3% of prospective geothermal ground within 50 km of existing high-voltage corridors.

Geological & Basement Setting

Subsurface lithology is characterized by extensional basin dynamics with median sediment thickness of 1 km and crustal thickness of 33.4 km.

Stored Heat Volume

Accessible thermal energy in place between 3 km and 7 km depth above 80°C totals 30.8 Zettajoules (ZJ).

Peer Comparison

Benchmarked against 237 global assessment jurisdictions, Slovenia demonstrates competitive positioning across heat flow, infrastructure, and basement competence indicators.

Target Sensitivity Analysis

Screening at 150°C baseline at 5.5 km increases prospective territory, demonstrating substantial deep EGS resource headroom.

Screening Methodology, Parameters & Limitations

This screening assessment for Slovenia is generated from Geothermal Radar Data Pack 2026.1 utilizing global 0.1° hex-grid thermal inversion across 225 model cells (land area: 20 273 km²). Baseline prospective criterion is defined as reaching 185°C at or above 5.5 km depth with surface temperature normalized to 15°C.

  • Screening estimates represent regional-scale heat in place and do not replace localized 3D seismic or exploratory drilling.
  • Model uncertainties expand in regions with sparse deep boreholes and complex thrust fault kinematics.
  • Grid proximity indicators reflect line-of-sight distance to high-voltage transmission and do not account for local substation thermal capacity.
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