America's Old Oil Wells Could Become Power Plants: Here's How

The U.S. Department of Energy has launched a funding program called Wells of Opportunity (WOO) to turn abandoned oil and gas wells into sources of renewable geothermal energy. Rather than drilling new wells from scratch, the program uses existing infrastructure that is already in the ground.

The approach works in two main ways. The first targets old, abandoned wells and upgrades them to tap into heat deep below the surface. The second works with wells that are still pumping oil or gas: when drillers hit extremely hot water during their operations, that heat can be captured to generate electricity without disrupting the oil and gas work happening above it.

Why This Matters

The United States has between 2 and 3 million disused oil wells scattered across the country. More than 500,000 of those are sitting in locations where the geology would work well for geothermal energy. Oklahoma and Texas alone account for over 800,000 historically drilled wells—most of them long since abandoned.

Rather than leaving these wells as abandoned holes in the ground, the DOE's program offers a way to repurpose them. A pilot project in Blackburn field aims to generate at least 1 megawatt of electricity from existing oil and gas wells. Another research effort at the University of Oklahoma is specifically focused on tapping geothermal heat from the state's sedimentary basins.

How the Technology Works

Geothermal energy comes from heat that naturally exists deep underground. For decades, geothermal power plants only worked in a handful of places where that heat was readily accessible—mostly in the western United States, particularly California, which currently generates two-thirds of America's geothermal power.

The new approach borrows drilling techniques from the oil and gas industry to reach that heat in places where it was not previously practical to tap. The wells operate as closed loops: water circulates down into hot rock formations and back up again, carrying heat that can drive turbines to make electricity or can be used directly to heat and cool buildings.

Because the wells use technology that oil companies have perfected over decades, the work can be done more affordably and quickly than drilling entirely new geothermal wells in untouched ground.

What's Changing at the Government Level

Oklahoma is updating its state laws to make it easier for companies to legally acquire old oil and gas wells specifically for geothermal conversion. One project has already received the first state permit in Oklahoma for this type of well conversion, creating a legal pathway for others to follow.

The federal government has also updated its regulations for geothermal development on public lands. This provides a framework for how well conversions can move forward on lands managed by the federal government.

Why Companies Care

Major oil and gas companies are paying attention. Chevron is developing a geothermal project in Nevada. ExxonMobil has set targets to reduce emissions from its operations by 2050, and geothermal conversion offers a way for these companies to generate clean energy from their existing wells while working toward those goals.

The appeal is straightforward: a well that is already paid for and already exists in the ground becomes a new source of revenue instead of a liability sitting idle. At the same time, it helps energy companies reduce their carbon footprint.

The broader context here matters. When the commercial internet emerged in the 1990s, new networks did not have to be built from nothing. They could use the telephone infrastructure that telephone companies had already laid into the ground. That existing foundation made scaling possible much faster than would have been the case from zero. Old oil wells represent a similar kind of existing foundation for geothermal energy—infrastructure already in place that can be repurposed for a new use.

What the Numbers Suggest

The Department of Energy projects that advanced geothermal technologies could deliver between 90 and 300 gigawatts of power generation capacity in the United States by 2050. This includes both traditional geothermal plants and converted oil wells.

For context, that is roughly equivalent to the total electrical output of 90 to 300 large coal or nuclear power plants. Whether the well conversion approach actually reaches those levels will depend on how quickly the technology scales, how costs decline, and whether state and federal regulatory frameworks keep pace.

Researchers are also studying whether this approach could work internationally—in Canada and the Middle East, for example—suggesting the potential market extends beyond U.S. borders.

The convergence of federal funding, new state regulations, and corporate interest indicates that well conversion is beginning to move from research laboratories into real-world deployment. What happens over the next few years will show whether this becomes a meaningful part of America's shift to clean energy or remains a smaller piece of the overall transition.