Green Steel Meets the Limits of Cheap Electricity

Steelmaking accounts for roughly seven to nine percent of direct global greenhouse gas emissions. Traditional blast furnaces burn coking coal to strip oxygen from iron ore. The primary low-carbon alternative swaps coal for green hydrogen, followed by melting in electric arc furnaces.

The chemical process works well in pilot plants. The economic model, however, relies on assumptions about cheap electricity that look less solid than they did five years ago. Producing hydrogen by electrolysis demands vast amounts of steady, low-cost power.

The hydrogen arithmetic

To make a single tonne of crude steel using hydrogen direct reduction requires several megawatt-hours of clean electricity. Most of that energy goes into split-water electrolysers. If electricity prices rise by even a few euros per megawatt-hour, production costs increase immediately.

Fossil-fuelled steelmakers face carbon taxes in parts of Europe, but coal remains cheap and energy-dense. Early green steel business models assumed renewable generation would expand fast enough to depress wholesale power prices indefinitely. That expansion has encountered regulatory delays, supply bottlenecks, and higher capital costs.

Grid constraints and regional competition

Physical transmission capacity is becoming as critical as generation. Industrial hubs must connect to high-voltage lines that are already congested by data centres, domestic heating, and battery factories. Upgrading these networks takes a decade or more.

In northern regions with strong hydro and wind assets, local governments initially welcomed industrial electrification. Now, competition for that limited clean baseload is sharpening. When one industrial plant requires the equivalent output of several nuclear reactors, other local consumers face higher tariffs and restricted access.

Market premiums versus commodity reality

Carmakers and premium manufacturers have signed early offtake agreements for low-emission steel at a premium. These deals demonstrate intent, but they represent a small fraction of total demand. Construction, infrastructure, and standard manufacturing operate on thin margins and remain price-sensitive.

Without sustained subsidies or heavy carbon border adjustments, green steel cannot undercut traditional mills in an era of elevated power tariffs. Capital is cautious. Developers must decide whether to build their own dedicated wind farms or wait for state-backed grid upgrades that may arrive too late.