Repurposing Abandoned Oil Rigs

By Felicity Bradstock
Originally published June 10, 2024
Updated by Kym Bolado on December 22, 2025

As oil operations wind down in several depleted oilfields, energy companies are looking for ways to repurpose old infrastructure to cut costs and support environmental efforts. It is extremely expensive to disassemble and transport old oil rigs, meaning that many companies have sought out alternative uses for the structures in recent years. Further, governments and environmentalists have been putting increasing pressure on oil and gas firms to reduce their impact on the environment. This has led energy companies in the U.S. to invest in transforming their old infrastructure into offshore wind farms, coral reefs, and mobile defense systems, to name a few transformations. 

The Situation

There are around 12,000 offshore oil and gas platforms worldwide and many of them are reaching the end of their lives. While decommissioning rigs safely and sustainably is complicated, it is vital. There are four conventional ways to decommission a platform; they can be partially or completely removed; rigs can be moved elsewhere; they can be abandoned in the deep sea, or they can be toppled and left on the sea floor.

Many companies now choose to dismantle and transport their rigs to a site where they can assess the materials for recycling and reuse. Over 90% of some structures can be reused or recycled in some cases. However, this option is costly and logistically complicated. For that reason, many companies are seeking alternative methods of disposal.

Transformation

Companies are exploring innovative ways to transform their old oil and gas infrastructure, rather than paying for it to be taken apart and disposed of. This can help energy firms to both cut costs and reduce waste.

Offshore Wind

There are several benefits to repurposing oil and gas infrastructure, such as the potential to use existing cables, communications infrastructure, and other technologies without the need to build a new structure from scratch. This has led many oil and gas companies to enter joint partnerships with wind energy firms to support the development of offshore wind farms located around out-of-use platforms.

One analysis reported, “It is estimated that approximately one-third of the total life costs (operation, maintenance, and service costs) of an offshore wind project can be favorably impacted upon by significant synergies with the O&G supply chain, by making it possible to electrify O&G offshore operations by installing wind farms nearby or by means of floating turbines, thus reducing the need to operate diesel or gas generators on the platform, reducing GHG emissions and air pollutants, and facilitating the energy transition, with platforms providing bases for wind farms.”

Coral Reefs

One idea that is winning the favor of environmentalists is the conversion of old platforms into coral reefs. While oil and gas companies don’t make a profit from this approach, they can significantly reduce the costs associated with dismantling and transporting the infrastructure for decommissioning.

The Rigs-to-Reefs program forms part of the Bureau of Safety and Environmental Enforcement’s (BSEE) Environmental Compliance Program. BSEE works to transform decommissioned rigs into artificial reefs. Platforms that have been situated in the sea for several decades eventually become habitats for marine life, and removing the structures can disrupt these habitats, which demonstrates the value of keeping these rigs safely in place.

Of course, the concept isn’t without controversy. Critics point out that the extraction and burning of fossil fuels from offshore rigs are major contributors to climate change, with oil and gas accounting for a significant portion of global CO₂ emissions. There’s also concern that cost savings for oil companies under rigs-to-reefs initiatives could unintentionally encourage further expansion of offshore drilling operations. However, supporters of the program emphasize that its purpose is not to reward polluters or bolster the oil industry, but rather to protect valuable marine ecosystems by providing an alternative to complete platform removal.

Research and public discussion continue over the best strategies for decommissioning, but the rigs-to-reefs approach stands out as a practical solution that helps conserve established marine habitats—balancing environmental, economic, and ecological considerations.

Concerns Over Rigs-to-Reefs Initiatives

While the transformation of old rigs into artificial reefs has environmental advantages, it isn’t without controversy. Critics argue that such programs could unintentionally soften the reputational or financial blow for oil and gas companies, potentially reducing their incentive to scale back offshore drilling. By offering a cost-effective alternative to full decommissioning, these programs might be seen as enabling operators to sidestep stricter regulatory measures or more expensive dismantling processes.

Some environmental groups highlight a worry that the prospect of cheaper and simpler end-of-life options might encourage prolonged or expanded operations, rather than hastening the industry’s transition away from fossil fuels. In short, while turning platforms into reefs can benefit marine ecosystems, there is ongoing debate about what long-term impact this approach has on the broader shift toward sustainable energy practices.

Fish Attachment to Platforms

But how do we know these artificial reefs genuinely become home for marine life and not just a convenient rest stop? Decades of research offer compelling evidence: fish aren’t simply passing through—they’re demonstrating real preference for these old platforms.

For example, marine biologists have tracked fish that had lived near oil platforms, relocated them to nearby natural reefs (sometimes as far as 18 kilometers away), and watched what happened next. A significant portion of these fish actually made the journey back to their original platform homes, some within a short time frame and others during specific seasons. This strong homing instinct, observed across multiple species, shows that platforms serve as more than just underwater structures—they become preferred habitats.

Fish often treat these towering skeletons as safe havens, returning to familiar territory even when given the choice of natural reef environments. This affinity illustrates just how effectively platforms can anchor thriving marine communities, which is one reason the Rigs-to-Reefs approach has garnered solid support among scientists and conservationists alike.

By 2021, over 600 platforms had been converted into permanent artificial reefs in the Gulf of Mexico. A typical eight-legged structure can provide a habitat for between 12,000 and 14,000 fish, while a four-legged rig can provide two to three acres of habitat for hundreds of marine species.

These towering steel structures, some stretching hundreds of feet from the ocean floor to well above the surface, act as vertical reefs—rare havens in otherwise open water. Their impressive height allows fish to migrate vertically as they mature, staying within the safety of the habitat rather than venturing into open sea. Over time, the pylons and crossbeams become encrusted with a vibrant mix of mussels, starfish, crabs, and other marine life, creating thriving ecosystems. In regions like California, some platforms are among the largest and deepest in the world, offering critical habitat for a vast array of species. Removing these structures can mean the loss of entire marine communities—one more reason why their conversion into reefs continues to gain support among conservationists and regulators alike.

California’s Approach to Rigs-to-Reefs

While the concept of transforming retired oil platforms into artificial reefs is gaining ground globally, progress in California has been noticeably slow. Despite the state passing legislation in 2010 to allow for platform-to-reef conversions, not a single rig off the California coast has yet been reefed. That said, the landscape may be on the cusp of change: as of today, eight out of California’s 27 platforms are already non-operational, and several more are scheduled for decommissioning in the next few years.

Adoption of the rigs-to-reefs strategy has proven especially challenging along the West Coast. California, after all, is renowned for its ambitious environmental policies and scenic coastline. Local attitudes often reflect a strong preference for the complete removal of oil and gas infrastructure, influenced by the desire to both protect marine ecosystems and maintain unobstructed ocean views.

Nonetheless, ongoing dialogue between environmental groups, policymakers, and marine scientists continues. As more platforms reach the end of their service lives, there is cautious optimism that California could soon embrace reefing as an ecologically and economically sound solution. The coming decade will likely determine whether rigs-to-reefs becomes a new norm for West Coast decommissioning projects.

Environmental and Community Concerns

Despite the ecological benefits of converting old platforms into artificial reefs, this approach is not without its critics. Several environmentalists express concern that leaving decommissioned rigs in place could be seen as letting oil and gas companies off the hook. There’s an underlying fear that the cost savings rigs-to-reefs programs offer might provide a perverse incentive—making continued fossil fuel development seem more attractive or palatable.

Many people, particularly in coastal communities, worry about the visual and environmental impact of these massive structures. Offshore platforms can be enormous—some stretch even deeper than the Eiffel Tower is tall—and for residents who treasure pristine ocean views, the continued presence of industrial infrastructure can be a difficult compromise. For states like California, where public sentiment is strongly against offshore drilling, removing the rigs entirely is often seen as the only way to restore coastal vistas and fully separate from fossil fuel activity.

Additionally, there is still ongoing debate within the scientific and policy communities about the long-term consequences of leaving these artificial habitats in place. While platforms can develop vibrant ecosystems, some critics argue that their continued presence doesn’t erase the environmental harm caused by decades of extraction, nor does it align with broader goals to move away from fossil fuels.

These opposing perspectives make the future of decommissioned rigs a complex issue, balancing ecological value with public perception and the urgent global push for cleaner energy alternatives.

Economic and Conservation Benefits for Local Communities

Repurposing decommissioned platforms as artificial reefs offers a wide range of economic and environmental benefits to nearby communities. For one, this approach can dramatically reduce the financial burden of dismantling and removing entire structures, freeing up significant resources for investment elsewhere. In fact, a portion of these savings is often allocated directly to the state’s artificial reef programs, which supports ongoing marine conservation efforts and public education initiatives.

Additionally, these thriving underwater habitats quickly become gathering points for a variety of fish and marine species. As a result, regions like the Gulf of Mexico have seen their former oil rigs transform into popular destinations for diving, snorkeling, and recreational fishing. This influx of eco-tourism helps local businesses, from tour operators and fishing charters to hotels and restaurants, creating jobs and stimulating sustainable economic growth—all while supporting the preservation of vibrant marine ecosystems.

Comparing Artificial Rigs-to-Reefs and Natural Reefs

Remarkably, these artificial reefs created from old oil and gas platforms often rival, and in some cases outshine, their natural counterparts in supporting marine life. Decades of research—much of it conducted off the coast of California—show that the towering underwater legs of decommissioned rigs offer a network of vertical surfaces ideal for larvae to attach, grow, and find protection from predators.

Unlike some natural reefs, which may be less expansive or located in areas with sparse marine populations, the substantial height and complexity of these platforms give rise to thriving aquatic communities. Certain species, such as rockfish—particularly the once-critical bocaccio rockfish—appear to benefit greatly. Scientists have recorded far higher densities of juvenile rockfish around platforms than at nearby natural reefs, occasionally numbering in the hundreds of thousands at just a handful of sites. These dense populations signal that, for some fish, the artificial reefs serve as a vital nursery and safe haven that can play a meaningful role in rebuilding depleted stocks.

Overall, transforming rigs into reefs provides a win-win: not only do they become crucial habitats for marine biodiversity, but their presence can also help restore overfished populations far more effectively than removal alone.

Supporting Endangered Species

Old oil platforms have unexpectedly provided vital support to endangered marine life, especially along the U.S. West Coast. For example, species like the bocaccio rockfish—once critically endangered due to overfishing—have found refuge among these structures. Research has shown that these platforms create densely populated habitats for juvenile bocaccio, offering protection and resources not as easily found on natural reefs.

In some cases, the sheer number of young bocaccio thriving near decommissioned rigs has meaningfully contributed to replenishing adult populations. Estimates suggest that juvenile survival rates around these platforms are significant enough to boost the overall numbers of the bocaccio rockfish population along the Pacific Coast, creating a measurable positive impact on species recovery efforts.

Mobile Defense Systems

Another use that is growing in popularity for old oil and gas platforms is mobile defense systems. The U.S. Navy unveiled a new initiative at the Sea Air Space 2024 expo – the Mobile Defense/Depot Platform (MODEP). The scheme aims to address security challenges in the Pacific Ocean by transforming old oil platforms into mobile missile defense and resupply bases.

The idea was developed by the engineering company Gibbs & Cox. Disused rigs could become large, self-sufficient island bases that can be strategically positioned and operated for up to 12 months at a time. Alternatively, they can be used as Afloat Forward Staging Bases, which provide logistical support for U.S. Navy surface combatants and nuclear submarines. These innovative bases are expected to help reduce the risks and costs associated with land-based defense systems. Transforming old rigs is also much cheaper than developing new Ballistic Missile Defense (BMD) systems, reducing costs by around 90%.

Finding ways to repurpose disused oil rigs can help oil and gas companies cut costs by huge amounts, as well as support the development of infrastructure for other industries. The transformation of platforms can help wind energy companies to produce clean energy offshore power, provide habitats to thousands of marine species and boost national security, thanks to the development of several innovative projects. Other companies have used old platforms to create adventure parks and diving centers, as well as for many other alternative uses.

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