Decarbonization as a Strategic Imperative: Why Tax Policy Matters

For years, decarbonization was often presented as a matter of purpose: a commitment to future generations and to the legacy we wish to leave behind. That remains compelling. But the argument has become more immediate. The way we produce and consume energy now shapes national security, economic resilience and the freedom of governments and businesses to make their own decisions.

The dependence of energy importers on fossil fuels creates a recurring geopolitical vulnerability. Oil and gas must be purchased continuously, and disruptions to their supply can spread rapidly through prices, public budgets and industrial costs. When a significant supplier is an authoritarian state, that dependence can also constrain diplomatic choices. Reducing fossil fuel demand is therefore one way to reduce exposure to political coercion.

Europe's experience after Russia's invasion of Ukraine made this risk impossible to ignore. The European Union responded by diversifying supply, cutting demand and accelerating its clean energy transition. According to the European Commission, EU imports of Russian gas fell from 152 billion cubic metres in 2021 to 36 billion in 2025, while Russian crude dropped from 20% of the bloc's oil imports in 2022 to 2% in 2025. A supply contract may look commercially efficient until a geopolitical crisis reveals the true cost of dependence.

The war in the Middle East that began in February 2026 has exposed the same vulnerability on a global scale. Fighting between Iran's authoritarian government and a US–Israeli coalition brought tanker traffic through the Strait of Hormuz, which carried around 20 million barrels of oil per day before the conflict, close to a standstill. The International Energy Agency has described it as the largest supply disruption in the history of the global oil market, surpassing the 1973 shock that led to the agency's creation. IEA members responded with the largest emergency stock release in the agency's history, 400 million barrels, yet oil prices still recorded their largest-ever monthly gain in March. The shock also reached gas markets, since around a fifth of the world's LNG passed through the Strait in 2025.

For energy importers, the lesson is that exposure depends not only on who sells the fuel, but also on the routes it must travel and the political stability of the regions where it is produced. In the Gulf, most major exporters are governed by non-democratic regimes.

For companies, this changes the meaning of a decarbonization plan. Fossil energy is an operating expense that must be bought again and again, at prices set by markets and, sometimes, by governments. Renewable generation has a different structure: most of its cost is paid upfront in equipment and infrastructure, while its primary energy comes from sunlight and wind. Energy efficiency reduces exposure to volatile fuel costs. Electrification and renewable power procurement diversify supply. Investment in cleaner production helps businesses remain competitive as customers, lenders and governments scrutinize emissions across value chains. Climate strategy increasingly belongs in decisions about capital expenditure, procurement and risk, not only in sustainability reporting.

None of this means that clean energy delivers automatic independence. Solar panels, batteries, wind turbines and electricity networks rely on minerals and manufactured components whose supply chains are often highly concentrated. The International Energy Agency reports that the three largest refining countries accounted for an average of 86% of the market for key energy minerals in 2024. Replacing one form of dependence with another would leave an important part of the strategic problem unresolved.

A durable transition therefore requires diversification as well as decarbonization. Countries need to consider where technologies are manufactured, where minerals are processed, how materials can be recycled and whether grids can withstand new demands. Companies need similar visibility into their supply chains. The objective is not complete self-sufficiency, which few economies can achieve, but greater flexibility when a supplier, trade route or technology becomes unavailable.

Tax policy has a central role in making that transition possible, and recent experience offers useful lessons. In the United States, the Inflation Reduction Act made many clean energy credits transferable, allowing developers to sell them to third parties and turning tax incentives into a direct source of project finance. Subsequent legislation in 2025 scaled several of those credits back, a reminder that legal certainty can matter as much as the generosity of an incentive. In the European Union, the Carbon Border Adjustment Mechanism entered its definitive phase in 2026, turning the emissions embedded in certain imports into a cost at the border and extending the reach of EU climate policy to exporters around the world. In Brazil, the Energy Transition Acceleration Program (Paten) allows companies to use credits held against the federal government as collateral for financing energy transition projects.

The design principles that emerge are consistent: incentives should reward measurable outcomes, remain stable long enough to support long-term investment and avoid locking economies into new concentrations of risk. Tax professionals are well placed to help, by connecting climate objectives with investment decisions, modelling the effect of incentives and border measures on business cases, and supporting transparent governance.

Decarbonization should still be judged first by its environmental results. Lower emissions are essential to limiting climate damage, and an energy strategy that ignored that purpose would miss the central challenge. But climate responsibility and strategic resilience now reinforce each other. The question is no longer whether decarbonization reflects our values. It does. The more urgent question is whether governments and businesses can afford to leave their energy future exposed to volatile markets and concentrated political power. Well-designed tax policy, with clear rules and sound governance, can help ensure that the transition delivers lasting economic, strategic and environmental benefits.