Shore Power, High Electricity Prices, and the Bonkers Economics of Decarbonisation

A recent BBC article highlighted a situation that perfectly captures the contradictions in our energy system.

Ports are investing in shore power — allowing ships to plug into the grid and switch off their onboard engines while docked.

But:

• Grid capacity isn’t always ready.
• Connection upgrades can take years.
• And in some cases, it’s cheaper for ships to burn marine fuel oil than use grid electricity.

If that doesn’t signal a structural problem, what does?

What Shore Power Is Supposed to Achieve

The benefits are clear:

• Improved local air quality (NOx, SOx, particulates)
• Reduced noise
• Lower CO₂ emissions (depending on grid intensity)
• Health benefits for surrounding communities

Technically, this is not revolutionary engineering. Ports across Europe and parts of Asia have already implemented it successfully.

So why are we struggling?

The Infrastructure Gap: Grid vs Port

There are two visible pressure points.

The Port Authority

Ports are being encouraged — politically and socially — to decarbonise. Installing high-voltage shore connection systems is capital-intensive. But even after investing millions, ports may find:

• The grid connection capacity is insufficient.
• Reinforcement requires upstream upgrades.
• Delivery times stretch into multiple years.

That creates commercial risk. No port wants to invest in infrastructure that cannot be fully utilised.

The Grid Operator

Grid operators face:

• Large, intermittent demand spikes from ships.
• Significant reinforcement requirements for high-voltage supply.
• Long planning and regulatory cycles.

Electrified ports represent concentrated industrial demand. They require anticipatory planning — not reactive reinforcement.

And that’s where timing becomes critical.

The Real Issue: Electricity Is Expensive

But the infrastructure delay is only half the story.

The bigger structural issue is this:

In some cases, it is cheaper for ships to burn marine fuel oil in port than to connect to grid electricity.

That’s not an engineering problem.

It’s an economic signal problem.

In the UK (and many other countries), electricity prices carry:

• Network charges
• Policy levies
• Renewable obligation costs
• Capacity market costs
• Carbon pricing pass-through

Meanwhile, marine fuels often benefit from significantly lower taxation, especially in international shipping contexts.

So we end up with a distorted hierarchy:

Clean electricity → more expensive
Polluting fuel → cheaper

And then we wonder why operators don’t switch.

Regulation vs Price Signals

One solution is regulation: ban the running of engines in port.

That would force adoption.

But if we are serious about system design, we should ask:

Why does the clean option require compulsion to compete?

If the energy system were correctly aligned, shore power would be commercially attractive — not something that requires enforcement to make it viable.

This Is Not Just a Port Issue

This situation mirrors wider UK electrification challenges:

• Heat pumps vs gas boilers
• Electric furnaces vs gas-fired industrial heat
• Electric vehicles vs diesel fleets

In each case, electricity carries policy costs while fossil fuels often remain relatively protected.

We are trying to decarbonise by electrification — but pricing electricity as a premium product.

That is a structural contradiction.

Who Owns the Problem?

Is it:

• The port, for investing ahead of grid upgrades?
• The grid operator, for being slow to reinforce?
• The ship operator, for choosing the cheaper fuel?

In reality, none of them are behaving irrationally.

The misalignment sits at policy and pricing level.

If decarbonisation is the goal, then:

• Grid reinforcement must anticipate electrification.
• Electricity pricing must be rebalanced.
• Fossil fuel tax treatment must reflect environmental cost.
• Connection timelines must accelerate.

Without this, we will continue to see projects that look progressive on paper but struggle in practice.

The Bigger Question

We often talk about “the energy transition” as if it’s primarily technological.

It isn’t.

The technologies exist.

What we are really struggling with is aligning infrastructure planning, regulatory frameworks, and price signals.

Until those three move in sync, we will continue to build low-carbon solutions that are technically sound — but commercially upside down.

And that’s when the system starts to look slightly bonkers.