If We Switch to Clean Power, Does the Leverage Go Away?

Is energy security just about how much you produce yourself?

No. Countries with high self-sufficiency still lose power, and countries with very little of it can be extremely stable. The difference is not the ratio but how many options remain when supply is interrupted.

Energy security asks four things at once: can you buy it, can you move it, can you afford it, and can you switch. The first three are intuitive. The fourth is the one most often overlooked, yet it is the only variable you can still change in a crisis: if you cannot buy, can you buy from someone else, burn something else, or route it another way?

It is more accurate to think of energy security as insurance than as inventory: what matters is not how much you stored in normal times but how many routes are still open on the day something breaks.

So which measures should you look at?

Self-sufficiency, source diversity, switching speed, and affordability. They have to be read together, because each one alone can be made to look good.

Self-sufficiency has the most obvious flaw: it counts total energy without asking whether those sources can substitute for one another when supply is disrupted. A country can have ample domestic coal and still ration electricity for want of gas, and the aggregate number will not show it.

Source diversity is often nominal. Buying LNG from five countries looks diversified, but if all five cargoes pass through the same chokepoint, there is really only one route. The question worth asking is where the routes overlap, not how many suppliers are on the list.

Switching speed is the hardest of the four to improve and the least likely to appear in a report. Between deciding to burn something else and the equipment actually burning it lie procurement, retrofitting, and commissioning, which take years.

Does switching to renewables make those dependencies go away?

They do not vanish; they change shape. Dependence on fuel becomes dependence on equipment and materials: turbine gearboxes and bearings, battery cathode material, transformers, high-voltage switchgear and cable, and the critical minerals processing behind all of them.

One difference makes this dependence easy to miss: fuel is bought daily, equipment once a decade. What happens every day gets written into risk reports; what happens every ten years does not, until the year something needs replacing and the lead time turns out to be measured in years.

The new dependence also sits in processing rather than geology. Where oil is depends on what is underground; the critical steps of electrification are mostly wherever someone was willing to invest and to carry the environmental cost. That matters because, in principle, it can be changed. In practice, though, what it takes is not a one-off subsidy but a decade of committed demand.

Why not simply stockpile more?

Because far less of an energy system can actually be stored than people assume. Tank farms can hold months of crude and refined products; gas can be stored, but at high cost and in limited volumes; electricity essentially cannot be stored at all, because a grid must balance supply and demand every second. That is physics, not policy.

Equipment is harder still. Nobody holds a decade’s worth of transformers and high-voltage switchgear: they are expensive, bulky, and specified to a particular grid. Processing capacity is not an inventory question at all: you can stockpile ore, but not the plant that turns ore into material.

In energy, then, supply chain resilience means a good deal more than a strategic reserve. A reserve buys time, and time is only worth something if there is a second route to take. Without an alternative, ninety days of stock simply pushes the same crisis back by ninety days.

What does this mean for Taiwan?

Taiwan imports nearly all its energy and runs an isolated island grid. A European country short of power can import from a neighbour; Taiwan cannot. That makes the fourth question, whether you can switch, unusually important, because there is no outside supply to fill a gap.

Taiwan is also taking on the new dependencies electrification brings: data centres and advanced-node fabs are both heavy electricity users, and the transformers, switchgear, and battery storage behind them all fall into the category that cannot be stockpiled.

For companies, the useful work is not forecasting oil prices but answering two questions precisely. If a critical piece of equipment failed today, what would the lead time be on a replacement? And do the suppliers on the list converge on the same firm three tiers up? Neither is an energy-policy question, yet together they decide where a company stands on the day supply stops.