Energy transition

The cost trajectory of renewable energy is the most transformative development of recent decades. Solar photovoltaic costs have fallen roughly 90% since 2010, primarily through scaling in China combined with continuous manufacturing improvements. Wind power costs have fallen similarly. Lithium-ion battery costs have fallen by similar magnitudes, enabling electric vehicles to become cost-competitive with internal combustion and enabling specific grid-scale energy storage that was not economical a decade ago. These cost declines were not predicted by most analysts twenty years ago, and they have reshaped what aggressive decarbonization actually costs. Many analyses now conclude that the cheapest way to decarbonize electricity is cheaper than continuing with fossil fuel generation, even without considering climate benefits.

Deployment of renewables has accelerated substantially. Global solar and wind capacity now exceeds the installed capacity of coal power globally. China has led most categories of clean energy deployment, building more solar, wind, and electric vehicles than any other country. The US has grown less dramatically but still substantially, particularly in Texas wind and Sun Belt solar. Europe has maintained steady growth. India, traditionally a major coal consumer, has begun substantial renewable investment. The specific absolute numbers are impressive the renewable capacity added each year now exceeds the total renewable capacity that existed globally in 2010.

Steel, cement, and chemicals are the main hard-to-abate industrial sectors. Steel production requires extremely high temperatures and uses coal both as a fuel and as a chemical reducing agent; current technology cannot easily replace the coal chemistry even with electric heating. Cement production releases CO2 directly through the chemical transformation of limestone, independent of what fuel is used. Chemicals production uses hydrocarbons as feedstock, not just fuel. Decarbonizing these sectors requires specific technologies green hydrogen for steel, alternative cements, carbon capture for cement and some chemicals that exist at demonstration scale but have not yet been deployed at industrial scale. The specific timelines for full decarbonization are probably 2040s or beyond for these sectors.

Aviation is particularly difficult. Jet fuel's energy density is hard to match. Batteries are too heavy for long-haul. Sustainable aviation fuels can work but are expensive and their carbon benefits depend on production pathway. Hydrogen and ammonia have been proposed but face technical challenges. The airline industry has set 2050 net-zero goals but faces skepticism about whether the technology scales. Behavioral changes less flying, more teleconferencing may be unavoidable regardless of fuel developments.

The fundamental political challenge is that transition costs are concentrated in specific industries and regions while benefits are diffuse and delayed. Coal miners, oil workers, and communities dependent on these industries face specific losses. Regions like West Virginia coal country have organized political opposition. The 'just transition' framework has tried to address these concerns through retraining and economic diversification, but actual investments have been modest relative to the scale of disruption.

International coordination is essential and difficult. Individual countries have incentives to delay their own transitions if other countries are moving faster, because they will get the benefits of global decarbonization without bearing their share of costs. The Paris Agreement's nationally determined contributions framework has produced commitments that are collectively insufficient to meet stated temperature targets. Border adjustment mechanisms (specifically the EU's Carbon Border Adjustment Mechanism) are emerging attempts to harmonize carbon policies across jurisdictions, but they face specific political resistance from affected countries.

The energy transition is proceeding at a pace that is historically unprecedented but slower than what climate science argues is necessary. Costs of key technologies have fallen dramatically, deployment is accelerating, and the specific technologies to address most sectors either exist or are in advanced development. The transition is no longer technically uncertain; what remains uncertain is whether the political economy can accelerate adoption fast enough to limit warming to levels that avoid the worst climate outcomes. The specific gap between current trajectory and the pace needed is substantial but not inconceivably large, which is why the coming decade is particularly consequential.