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The global energy sector from a subsurface perspective

Geothermal

World’s largest geothermal reserves?

Elliot Yearsley
By convention, geothermal reserves are normally reported as net recoverable energy – usually as Megawatts of electrical generating power (MWe) for a specified period of time – 30 years is…

Layer cake geology and a lack of grid access

Henk Kombrink
A few years ago, I asked a seasoned wellsite geol­ogist about the biggest subsurface surprise she had ever seen over her long career working on rigs. Rather than coming up…

A very expensive fart in the wind

Henk Kombrink
Early December last year, Eavor announced the start of electricity production from their Geretsried deep closed-loop project in the south of Germany, near the village of Geretsried. As expected, it…

Where the earth yawns

Susan Fellows
I first visited Iceland a decade ago. Recently, I returned, courtesy of a European Geothermal Research project, hosted by Reykjavik En­ergy. We learned about heating and electricity production in Iceland,…

Denmark to embark on an innovative geothermal drilling project

Louise Broen Larsen, Mads Sylvest Eegholm, Nikolaj Holmer Nissen, Camille Hanna, and Kim Gunn Maver, Green Therma
Green Therma, in collaboration with Aalborg Forsyning (the local utility company), is cur­rently preparing to drill a single well to deliver geothermal heat directly to Aalborg’s district heating network. While…

Fracture connectivity and power laws

Henk Kombrink
It was about a year ago that I heard about a deep geothermal drilling project in Finland (St1 Deep Heat Project), during which a couple of 6 km deep wells…

The hidden lithium treasure of South Australia

Geoff Freer, Hydro Lit
Despite receiving just 165 mm of rain annu­ally, Coopers Creek flows year-round, an anomaly that has lured generations of explorers in pre-history to early Euro­pean settlers. Exploration by geologist Reg…

Are deep closed-loop geothermal systems doomed?

Henk Kombrink
“Claims of universal geographical scalability of Closed Loop Geothermal Systems (CLGS) in power generation at competi­tive prices are not supported by simulation results,” is what the authors conclude in a…