Geothermal power, which extracts heat from underground reservoirs, has the potential to revolutionize electricity generation while ushering in a new era of environmental responsibility. In this discourse, we unveil the profound impact of geothermal power on reducing carbon emissions and propelling the world towards a more sustainable energy future.

Geothermal power is a technology that draws its energy from subterranean reservoirs of hot water. This natural heat source is harnessed and conveyed to the surface via an intricate network of systems, ultimately driving turbines to produce electricity. The hallmark of geothermal power lies in its remarkable ability to generate electricity devoid of pollution, a significant departure from conventional electricity-generating technologies such as coal, oil, and natural gas power plants.

Geothermal power is founded on an ingenious concept. It thrives in regions where prime geothermal conditions are found, encompassing less than 10 percent of the planet. Nevertheless, technological advancements have dramatically expanded its production potential. Three primary geothermal technologies spearhead this transformation: dry steam, flash steam, and binary cycle power plants. Among these, flash plants prevail as the most common. Notably, binary cycle plants, the most recent innovation, extend their reach to tap into lower-temperature reservoirs, albeit at higher costs. The selection of the technology hinges on diverse factors, including the nature of the geothermal resource and the project's economic viability.

One of the crowning merits of geothermal power is its uninterrupted and constant resource availability. Geothermal production remains operative 24/7, irrespective of weather conditions. This reliability, coupled with the efficiency of geothermal systems, underscores their potential as a prolific and sustainable source of clean energy. While the initial drilling investment may pose financial challenges, the inherent heat source is perennial and free.

A pivotal evolution in the geothermal landscape involves enhanced or engineered systems, particularly those harnessing the latent potential of "hot rock." The nascent state of enhanced geothermal systems technology necessitates concerted research and development efforts to unlock its vast potential.

In the forthcoming years, the accelerated deployment of geothermal energy hinges on technological advancements, cross-industry collaborations, and the expanding utilization of geothermal for heating and cooling applications. Our global assessment provides a comprehensive overview of the developments within the geothermal sector and the key factors likely to shape its growth in the near future. Our recommendations target policy makers, governments, potential investors, and development partners, offering guidance on how to promote the growth of the geothermal market and integrate it further within global energy systems.

To gauge the impacts of increased adoption of geothermal power from 2023 to 2050, we juxtaposed the growth scenario with the market share fixed at current levels. This adoption is conservatively estimated at 4 percent of the total addressable market.

The innovative nature of enhanced geothermal systems technology renders the evaluation of commercial-scale costs intricate. Our analysis anchors the average installation cost for various geothermal plants at US$5,839 per kilowatt, encompassing insights from installation costs worldwide. A dynamic learning rate of 10 percent encapsulates the future costs of mature technologies such as flash and binary cycle power plants. This rate also acknowledges the inherent uncertainties in the development of enhanced geothermal systems, culminating in an investment cost reduction to US$3,974 per kilowatt by 2030 and a remarkable US$3,218 per kilowatt by 2050.

The geothermal systems for electricity generation stand out with an impressive average capacity factor of 86 percent, a noteworthy elevation compared to the 57 percent associated with conventional technologies such as coal, natural gas, and oil power plants. Variable operation and maintenance costs are efficiently managed at US$0.02 per kilowatt-hour, complemented by fixed costs of US$200.61 per kilowatt. The prudent management of fuel costs further highlights the operational and maintenance efficiency of geothermal plants when compared to coal and natural gas alternatives.

The net first cost associated with implementing the adoption scenario as outlined in the assumptions is projected at US$109.64 billion from 2020 to 2050, underpinned by a compelling US$1.03 trillion in net operational savings over the lifetime of the technologies. This trajectory further empowers geothermal technologies for electricity generation to stave off 6.15 gigatons of carbon dioxide equivalent greenhouse gas emissions from 2020 to 2050.

The geothermal energy sector boasts vast and untapped technical potential. Its initial development could unfold in regions endowed with high-temperature hydrothermal resources, yet to be fully explored. Areas such as Indonesia, the Philippines, Central and South America, and East Africa hold immense promise. Geothermal power assumes a pivotal role in augmenting the grid integration of other renewable electricity sources, further reducing emissions.

The expansion of geothermal electricity, however, faces formidable barriers, primarily associated with high upfront costs and the inherent risk of investment. The drilling rig rates and related costs, often constituting the largest cost component, are fraught with exploration uncertainties and a high likelihood of exploratory failures.

Governments are poised to set targets for the development of high-temperature hydrothermal resources. Supportive measures include renewable portfolio standards, carbon pricing, guaranteed power purchase agreements, or feed-in tariffs. The creation of a publicly accessible and regularly updated geothermal resource database holds the potential to streamline exploration efforts and diminish production costs. Moreover, there exists an urgent need for sustained investment in technology research, development, and demonstration to unlock the full potential of geothermal energy.

Geothermal power stands as an exemplar in our crusade for carbon neutrality. This sustainable energy source, with its exceptional reliability and efficiency, offers the world a golden opportunity to reduce carbon emissions and accelerate the transition to cleaner, renewable energy.

References.

IRENA and IGA (2023), Global geothermal market and technology assessment, International Renewable Energy Agency, Abu Dhabi; International Geothermal Association, The Hague.

Fridleifsson, Ingvar B.; Bertani, Ruggero; Huenges, Ernst; Lund, John W.; Ragnarsson, Arni; Rybach, Ladislaus (11 February 2008). O. Hohmeyer and T. Trittin (ed.). The possible role and contribution of geothermal energy to the mitigation of climate change (PDF). IPCC Scoping Meeting on Renewable Energy Sources. Luebeck, Germany. pp. 59–80.

Craig, William; Gavin, Kenneth (2018). Geothermal Energy, Heat Exchange Systems and Energy Piles. London: ICE Publishing. pp. 41–42. ISBN 9780727763983. Archived from the original on 21 August 2018.