The Cost of Waiting: Why Regulation and Reputation Decide the Fate of Water-Risked Plants

By Ridhi Aggarwal and Monserrat Magaña Ocaña

Golfech nuclear power station on the Garonne River, France. Thermal power plants rely on large volumes of river water for cooling and may be forced to reduce output when environmental temperature thresholds are reached. Photo credit: Peter Woodman via Flickr/licensed under Creative Commons CC BY-SA 2.0

On a hot afternoon in southern France, the operators of the Golfech nuclear power station began watching the river more carefully than usual. The Garonne flowed quietly past fields and villages, but its temperature had begun creeping upward. Nuclear reactors depend on large volumes of water to dissipate heat, and environmental regulations in France impose strict limits on how warm discharged cooling water can be. When the river temperature approaches a legal threshold, 28 degrees Celsius, the plant must reduce output or shut down entirely to protect aquatic ecosystems.

The turbines were still capable of running. Fuel supplies were stable. Yet as the water warmed, the operators began cutting production. A gigawatt of power disappeared from the grid: not because of a mechanical failure, but because the river itself had become the binding constraint. Across Europe, similar episodes have repeated during heat waves and droughts, forcing utilities to curtail generation even when demand for electricity is soaring. What appears in financial reports as “temporary production curtailment” is, in fact, the direct consequence of water risk.

Events like this are becoming more common, yet corporate risk assessments often misunderstand how they occur. Water risk is frequently framed as a purely physical problem: how much water a facility needs, how much is available, and how infrastructure might buffer fluctuations in supply. That framing, however, misses the mechanism through which water scarcity becomes economically material. Industrial plants rarely shut down simply because a basin becomes drier.

More often, scarcity sets off a chain reaction involving regulators, communities, and investors: actors who ultimately determine whether operations can continue.

In practice, water risk rarely moves directly from hydrology to shutdown. It travels instead through institutions and society. A drought deepens, and regulators tighten abstraction permits. Communities facing shortages protest industrial water use. Local media amplify the conflict, and investors begin asking questions about governance and environmental stewardship. Eventually a permit is suspended, a license renewal is delayed, or a court intervenes. Only then does the plant slow or stop.

This pattern appears across industries and continents. Mining operations in Peru have been halted when communities blocked access to reservoirs supplying industrial water. Semiconductor manufacturers in Taiwan have scrambled to truck water to fabrication plants during drought restrictions. Beverage companies operating in water-stressed regions have faced protests and legal challenges that ultimately forced facilities to close. In each case, the operational outcome—such as shutdown, slowdown, or project cancellation—was triggered not by hydrology alone but by regulatory enforcement or reputational escalation.

And we can find these patterns across the world, especially because it is so often the most vulnerable communities who bear the costs and consequences of climate change. When governments are not effective at solving these long‑standing environmental and social debts, problems escalate to the point where the only short‑term way to appease public discontent is to “show” they are acting—by shutting down a plant, for example. Some politicians even double down on this narrative against industry, framing it as “the good people” (community and government) vs. “the industry and companies” (evil entities stealing our water).

We’ve seen how politicians have piggybacked on this us‑vs‑them strategy, especially for very hard problems where there is no quick fix and no clear leadership on how to solve them. We see this in inequality, migration, trade, and more. A very clear example was the shutdown of Constellation Brands’ project in Mexico.

Understanding this pathway is critical because the financial stakes are enormous. Corporate disclosures analyzed by CDP suggest that companies reporting on water risk face potential financial impacts exceeding $500 billion dollars globally, a figure that places water alongside the most significant operational hazards confronting industry. Moreover, according to the World Economic Forum for more than seven years, water crises have ranked among the world’s top five global risks, ultimately leading to a 2026 UN report that described our situation as an era of “global water bankruptcy.” Yet mitigation investments remain far smaller than the potential losses they aim to avoid.

The gap reflects a deeper problem: many firms still struggle to quantify the economic consequences of delaying water-related investments.

Consider the role of regulatory thresholds. Environmental regulations often translate gradual environmental changes into abrupt operational consequences. Thermal power plants, for instance, must comply with limits on river temperature and discharge levels. A river warming by a few degrees may have limited ecological impact on its own, but once it crosses a regulatory threshold, continued operation becomes illegal. The plant must immediately reduce output or shut down until conditions improve. In effect, regulation converts environmental variability into a binary operational constraint.

Reputational pressure can be just as powerful. When water becomes scarce, industrial users inevitably become visible to surrounding communities. Questions arise about fairness: why should factories continue operating while households ration water? In regions where water supplies are shared between agriculture, cities, and industry, these tensions can escalate rapidly. Media coverage intensifies scrutiny, advocacy groups mobilize campaigns, and political leaders step in to address public concerns. The result is often a sudden tightening of regulatory oversight.

A striking example occurred in Peru in 2022, when a dispute between a mining company and nearby communities escalated into a blockade that cut off access to the reservoir supplying the mine. Rail lines were blocked, pipelines were closed, and operations were suspended. Nothing had changed about the hydrology of the basin; rainfall patterns were unchanged, and groundwater levels were stable. What had changed was the social legitimacy of industrial water use. Once that legitimacy collapsed, the mine’s operations became untenable.

This phenomenon, sometimes described as a “social license shock”, is increasingly common in water-stressed regions. Communities perceive inequality in water allocation, particularly when industries draw from the same sources that supply drinking water or irrigation. Political leaders may intervene to prioritize domestic use during drought emergencies, and regulators may revise permits or impose temporary restrictions. In effect, water scarcity becomes a political resource, and industrial access to that resource becomes contingent on public acceptance.

For companies operating water-intensive assets, the economic consequences of such conflicts can be severe. Short-term disruptions— such as emergency water procurement, regulatory fines, or temporary production cuts— may cost millions of dollars. More prolonged interruptions, including project delays or extended shutdowns, can escalate into tens or hundreds of millions. At the extreme end of the spectrum lie catastrophic events: environmental disasters, litigation settlements, or long-term project suspensions costing billions. The financial distribution of water-related losses resembles catastrophe risk more than routine operational variance.

The challenge for companies is therefore probabilistic rather than purely technical. Water risk must be understood as the interaction of three forces: physical scarcity, regulatory enforcement, and reputational pressure.

Each of these forces evolves over time and can amplify the others. When they converge, the probability of operational disruption increases sharply.

At Celeste, this insight forms the basis of our cost-of-inaction methodology. Instead of treating water risk as a static measure of scarcity, we model it as a dynamic system of pressures acting on an industrial facility. Physical pressure reflects the hydrological conditions of the basin: drought frequency, groundwater decline, and seasonal variability. Regulatory pressure captures the institutional environment governing water use: permit structures, enforcement history, and the likelihood of regulatory intervention. Reputational pressure reflects the social context in which a company operates: community relationships, media attention, and investor scrutiny.

Each pressure influences the probability that a facility will experience operational disruption. A plant operating in a physically stressed basin may function normally for years if regulatory oversight is stable and community relations are strong. Conversely, even moderate water scarcity can trigger significant disruption when political or social tensions escalate. By modeling these interactions over time, the cost-of-inaction framework estimates the expected financial consequences of waiting to invest in water resilience.

This perspective also reframes the nature of water strategy. If water risk were purely a physical engineering problem, the solutions would focus on treatment technologies, storage capacity, or desalination infrastructure. While such investments are sometimes necessary, they are not always sufficient. Because regulatory and reputational dynamics often determine whether a plant continues operating, effective risk mitigation frequently involves broader interventions.

Companies increasingly invest in watershed restoration projects to stabilize basin hydrology, co-finance municipal water infrastructure, or implement community water access programs designed to reduce local tensions. These initiatives are sometimes described as sustainability programs, but their underlying function is economic.

By reducing the probability that water scarcity will escalate into regulatory enforcement or social conflict, they lower the expected cost of operational disruption.

Water risk is often described as the next frontier of climate-related financial risk. Yet the emerging evidence suggests something more complex. Scarcity alone rarely determines whether industrial operations continue. What matters is how societies respond to scarcity: how regulators enforce environmental thresholds, how communities defend access to shared resources, and how investors interpret corporate governance practices.

For companies operating in water-stressed regions, the strategic question is therefore not simply how much water is available. It is whether the institutions surrounding that water—laws, communities, and markets—are stable enough to sustain industrial activity.

The operators at Golfech understood this dynamic intuitively as they watched the Garonne warm. Long before a turbine stopped spinning, the decision about whether the plant could continue running had already been made; written into environmental regulations, shaped by public expectations, and ultimately dictated by the temperature of the river itself.

By the time the water reaches 28 degrees, the cost of waiting has already begun.

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Authors:

Ridhi Aggarwal is the Investments Lead at Celeste, where she leads the development of analytical frameworks that translate water-related risks into financial decision-making tools. Her work focuses on establishing investment-ready internal business cases for companies to justify watershed projects.

Monserrat Magaña Ocaña is a Policy Advisor at Celeste, specializing in water governance and institutional frameworks for sustainable resource management. Her work focuses on aligning public policy, institutions, and private sectors stakeholders to advance long‑term water security and inclusive economic prosperity.