Penzenreuth-Deep Drilling
The Deep Drilling Geo-Zentrum to the north of the town of Penzenreuth has a long and interesting past in European energy history. The 1980s were a controversial decade in which to embark upon a deep drilling project in Germany. Beyond scientific interest and geothermal exploration, deep drilling has its roots and ambitions in fossil fuels and the nuclear industry: underneath the surface of the earth, these projects searched for possible sources of oil and natural gas, and for permanent disposal sites for nuclear waste. Hence, deep drilling was fundamentally at odds with the growing environmental movement.
A watershed moment for the movement had come at in 1980. Opponents of nuclear energy occupied the site of a drilling project in the Wendland area of Lower Saxony. The West German government had commissioned a search for potential nuclear waste disposal sites. Over the course of a month, protesters held out in makeshift houses of wood and clay, proclaiming a "Free Republic". The group even issued its own pamphlets-turned-passports. In the same year that the Wendland occupation became a symbol for opposition to nuclear energy, the Green Party formed, permanently altering the political landscape of the Federal Republic.
For the community of Penzenreuth, however, the tensest events took place closer to home. In March of 1986, a planned nuclear preprocessing plant in Wackersdorf, to the south of today's deep drilling site became center stage of the conflict. Locals and environmental activists fiercely resisted the construction of the plant. As police forces attempted to dissolve a protest camp, they clashed with over 100,000 people. The state and police doubled down on their repressive strategy, resulting in the first recorded use of teargas on civilians in Germany and the death of a 38-year-old engineer who died from asthma complications. The opponents of nuclear energy gained further ground in the light of the Chernobyl disaster in April of the same year. In the region, a large alliance of youth organizations, engineers, doctors, clerics, politicians, and environmental activists formed, holding a large music festival in July 1986, sometimes called the "German Woodstock".
Hence, when the site for the deep drilling project was announced in October 1986, tensions were still high in the region. The German public had grown increasingly skeptical of what many activists called the "technological hybris" of large-scale invasive projects. When drilling began in September 1987, the inhabitants of nearby towns voiced concerns over the release of harmful gases. In initial measurements, only small increases in helium, hydrogen, and methane could be detected. So, the drilling continued, going 4,000 meters deep in a pilot before embarking upon the main borehole, which reached 9,000 meters in 1994. This was a technological feat: until its deepest point, the drilling remained almost perfectly at a right angle. The borehole was lined with stainless steel to prevent its erosion. At the deepest point of drilling, the earth reaches temperatures close to 300 degrees Celsius, a considerable challenge for measurement instruments. The considerable cost of the project – at around $700 million in contemporary value – paid off in terms of scientific findings: the project provided ample geological insight into the composition of the earth's layers, and added to the understanding of earthquake prediction, since the region was chosen as a contact zone of ancient continental plates. It also provided a state-subsidized technological boost to deep drilling, which benefited the industries that employ drilling rigs for oil and gas exploration.
Returning from the tensions of 1987 to emissions measured in 2019: could two boreholes completed thirty years ago, penetrating the earth's crust so deeply, have been responsible for methane emissions of 39 tons of methane per hour? Given the initial uncontroversial measurements, and the location of the detected emission site almost 30km to the west of the borehole on a not particularly windy day, this might be a stretch. Geologists working at the site Conversation with Dr Erik Spangenberg of 14 May 2024. explained that the borehole, unlike others of its kind, penetrates crystalline rocks with few pores. This makes a large and sudden emission of methane unlikely. But for the opponents of nuclear energy, camping out in a forest in the 1980s, one of the eventual findings of the drilling project would have been of interest: that there were large and mobile flows of water in deep layers of the earth, casting doubts on these and other sites' potential as a location for the safe storage of nuclear detritus.
Today, the deep drilling boreholes remain locations of continued scientific engagement. Thousands of visitors each year visit the Geo-Zentrum museum, which is devoted to the history of the project. The site also attracts geological researchers, as it provides a measurement infrastructure for experiments. With recent initiatives for the use of geothermal energy from deep-drilling sites, this interest is likely to increase in the future.
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