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Berlin awards first deep geothermal exploration drilling contract

Berlin awards first deep geothermal exploration drilling contract

Built World

BEW Berliner Energie und Wärme to drill 1,950-meter well at Marzahn in city's heating transition

2 days ago: First exploration drilling contract awarded

Overview

Updated Yesterday

Berlin has awarded its first deep geothermal exploration contract, putting a drill bit into the ground for the first time in a citywide push to heat the capital with underground hot water. District heating utility BEW Berliner Energie und Wärme (BEW) will sink an exploration well to about 1,950 meters at its Marzahn power plant site, investigating four thermal water-bearing rock layers — aquifers — that could supply heat for the city's grid.

The contract, awarded October 19 by Berlin's Senate Department for Mobility, Transport, Climate Protection and the Environment, is the first fruit of a tender launched in December 2025 for seven sub-areas within the city's new 550-square-kilometer geothermal exploration permit. Drill cores and hydraulic tests at Marzahn will produce the data Berlin needs to decide whether deep geothermal can replace fossil-fuel heating ahead of its 2045 climate-neutrality target. BEW's own roadmap envisions 70 megawatts thermal of geothermal capacity by 2035 and 250 megawatts by 2045.

Why it matters

Berlin's plan to switch its district heating from fossil fuels to geothermal rises or falls on what these drill cores reveal.

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Key Indicators

1,950 m
Exploration well depth at Marzahn
Target depth of the first exploration borehole, as announced by BEW and the Berlin Senate.
4
Aquifers to be investigated
Thermal water-bearing rock layers the Marzahn well will test.
550 km²
Geothermal exploration permit area
Size of the 'Erdwärme Berlin' permit field, valid for five years from 2025.
70 MWth by 2035
BEW geothermal capacity target
Megawatts thermal the utility aims to produce by 2035, rising to 250 MWth by 2045.
7
Tendered exploration sub-areas
Sub-areas within the permit field offered in the December 2025 EU tender.

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People Involved

Organizations Involved

Timeline

July 2023 June 2028

7 events Latest: 2 days ago
Tap a bar to jump to that date
  1. Seismic data analysis expected complete

    Upcoming Survey

    Analysis of the 3D seismic survey is scheduled to finish in the first half of 2028, enabling follow-up drilling decisions.

  2. 3D seismic measurements to begin

    Upcoming Survey

    Citywide seismic measurements are planned to start in Q1 or Q2 2027 and last about four months.

  3. First exploration drilling contract awarded

    Latest Contract

    SenMVKU awards BEW the right to drill an exploration well at the Marzahn power plant site to about 1,950 meters.

  4. Seismic survey contractor search closes

    Tender

    Deadline for companies to bid on planning and measuring work for the citywide 3D seismic campaign.

  5. Berlin launches tender for exploration rights

    Tender

    SenMVKU opens an EU-wide competition for usage rights to seven sub-areas within the permit field.

  6. Berlin receives 550 km² geothermal exploration permit

    Regulatory

    The State Office for Mining, Geology and Raw Materials (LBGR) grants the 'Erdwärme Berlin' exploration field, valid for five years.

  7. Berlin adopts Deep Geothermal Roadmap

    Policy

    The Berlin Senate approves a roadmap setting a detailed plan for citywide geothermal exploration and development.

Scenarios

1

Marzahn drilling confirms productive aquifers

Likely Resolves by Q2 2028

Discussed by: BEW and Berlin Senate officials; ThinkGeoEnergy industry analysts

The 1,950-meter well encounters thermal water in one or more of the four target aquifers at sufficient temperature and flow. BEW proceeds to production well planning at Marzahn, and other sub-area winners use the validated geology to fast-track their own exploration. Berlin moves from exploration to construction.

2

Exploration well comes up dry

Possible Resolves by Q2 2028

Discussed by: Geothermal industry risk assessments; observers of early-stage exploration

The Marzahn borehole finds insufficient temperature or permeability in the target aquifers, a common outcome in frontier geothermal exploration. Berlin's roadmap adjusts — exploring alternative sites within the permit field or relying on the simultaneous 3D seismic survey to identify better targets elsewhere in the city.

3

Exploration expands across all seven sub-areas

Likely Resolves by End of 2030

Discussed by: Berlin Senate planning documents; observers of the tender process

With the Marzahn contract proving the model, the remaining six sub-areas attract winning bidders who begin their own exploration drilling within the permit's validity period. Berlin coordinates the work through its retained mining license, building toward a citywide geothermal network rather than isolated projects.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

July 2020

Germany's coal phase-out (2020)

The German parliament passed the Coal Phase-Out Act, setting a hard deadline of 2038 for ending coal-fired power generation, with earlier closure targets for specific plants. Berlin's local coal plants, including the Marzahn site's neighbors, face closure under this timeline.

Then

Utilities and cities began planning replacements for coal-fired district heating.

Now

The phase-out created the demand Berlin's geothermal program now aims to fill.

Why this matters now

The Marzahn exploration site is on a power plant campus whose coal-fired heat production must be replaced by 2038 at the latest — the deadline concentrating Berlin's mind on geothermal now.

1933–1970s

Reykjavik's geothermal district heating transition (1930s–1970s)

Iceland's capital shifted from imported coal and oil to geothermal district heating, starting with a pilot geothermal pipeline in 1930 and building out a citywide network over subsequent decades. Today, about 95% of Reykjavik's heating comes from geothermal sources.

Then

The city cut its reliance on imported fossil fuels and stabilized heating costs.

Now

Reykjavik became the global reference case for geothermal district heating — the model Berlin is trying to replicate.

Why this matters now

Reykjavik shows what is possible when a city commits to geothermal district heating over decades. Berlin's geological conditions differ — sedimentary aquifers rather than volcanic fields — making exploration riskier and the Marzahn test well more consequential.

1987–2016

Soultz-sous-Forêts enhanced geothermal project, France (1987–2016)

A European research team spent nearly three decades developing enhanced geothermal systems at Soultz-sous-Forêts in the Rhine Graben, drilling to 5,000 meters and repeatedly stimulating fractures to extract heat. The project produced electricity commercially only in 2016, after years of technical setbacks.

Then

The project proved that engineered geothermal reservoirs can work in deep sedimentary settings.

Now

It remains a cautionary tale about exploration timelines — what looks promising in theory can take decades to commercialize.

Why this matters now

Berlin's aquifers are shallower and simpler than Soultz's enhanced systems, but the French project shows how exploration risk and long lead times shape geothermal economics — exactly the uncertainty Berlin's drilling program is designed to retire.

Sources

(6)