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The Dirty Little Secret of Geothermal Energy: It’s Not as Clean as You Think

Posted on May 21, 2025 By Dante No Comments on The Dirty Little Secret of Geothermal Energy: It’s Not as Clean as You Think

As the world continues to grapple with the challenges of climate change, renewable energy sources like geothermal energy have gained significant attention. For many, it’s seen as a clean, reliable, and virtually limitless source of power. But, as with many things, the truth is more nuanced. Geothermal energy, while a valuable addition to the renewable energy mix, is not as clean-cut (pun intended) as we’ve been led to believe.

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One of the primary concerns with geothermal energy is the greenhouse gas emissions associated with its development and operation. The process of harnessing geothermal energy often requires the injection of fluids into underground reservoirs, which can lead to the release of methane and carbon dioxide. These potent greenhouse gases contribute to climate change, offsetting some of the benefits of using geothermal energy. According to a study published in the journal Environmental Research Letters, the average geothermal power plant emits around 20 grams of CO2 per kilowatt-hour (kWh) of electricity generated.

Another, more insidious issue is the potential for induced seismicity – the human-induced earthquakes caused by the injection of fluids into the ground. While not typically catastrophic, these small earthquakes can still cause structural damage and disrupt local communities. The risk of induced seismicity is particularly high in areas with existing faults or tectonic instability, making the siting of geothermal power plants a complex and contentious issue.

Learn more: Tidal Energy: The Unsung Hero of Renewable Power That's Struggling to Make Waves

Despite these drawbacks, geothermal energy still holds significant promise. When done responsibly, it can provide a reliable and carbon-free source of power. In fact, a study by the National Renewable Energy Laboratory found that geothermal energy has the potential to meet up to 10% of the world’s electricity demand by 2050.

So, what can be done to mitigate the environmental impacts of geothermal energy? The key lies in responsible development and operation practices. This includes careful site selection, rigorous monitoring of injection fluids and seismic activity, and the adoption of best practices for fluid management and disposal.

As we move forward in our transition to a low-carbon economy, it’s essential to have a nuanced understanding of the benefits and drawbacks of geothermal energy. By acknowledging its limitations and working to address them, we can unlock the full potential of this valuable renewable energy source.

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