There’s a strange irony in today’s energy transition.
For decades, engineers have admired molten salt nuclear reactors for their elegance: high-temperature operation, thermal storage capability, and the ability to decouple energy generation from electricity production. In theory, they solve intermittency, improve efficiency, and provide dispatchable power.
But what if you could get most of those benefits… without the nuclear part?
That’s exactly what is quietly emerging, retrofitting Coal power plants.
The Simple Intuition
Start from first principles.
A traditional gas plant works like this:
- Buy fuel (natural gas)
- Burn it
- Produce heat
- Run a turbine
- Generate electricity
Every MWh produced requires continuous fuel input.
Now flip the model:
- Take excess wind or solar power (often priced at €0 or even negative)
- Convert it into heat
- Store that heat in molten salt
- Use it later to run the same turbine
You’ve just removed the fuel.
What remains is:
A heat engine powered by previously stored, near-free energy.
This Is Basically a Nuclear Reactor… Without Uranium
A molten salt nuclear reactor is, at its core:
- A high-temperature heat source
- Coupled to a steam cycle
- With thermal storage characteristics
Now replace:
- Nuclear fission → electric heating from wind/solar
- Reactor core → molten salt tanks
- Just retrofit your existing Coal power plants
What you get is:
A thermal power plant with storage, capable of dispatching electricity when needed
No uranium.
No chain reaction.
No uranium.
Low cost of long term storage
Kills Dunkelflaute
Why Efficiency Is the Wrong Question
Critics often jump to:
“But converting electricity to heat and back is inefficient.”
They’re right — thermodynamically.
But they’re wrong economically.
Power systems don’t optimize for efficiency. They optimize for cost.
If your input energy costs ~€0:
- Losing 50–60% of it doesn’t matter much
- Your marginal cost is still near zero
Compare that to gas:
- Every MWh requires fuel
- Fuel prices are volatile and often high
So the real comparison is:
Cheap, “inefficient” stored energy vs. expensive, “efficient” fuel combustion
And in many cases, the former wins.
The Key Advantage: Storage at Scale
Molten salt is not new. It’s been used in concentrated solar plants for years.
What’s different now is how it’s used:
- Not tied to solar towers
- Not dependent on direct irradiation
- Instead: charged by the grid itself
This unlocks something critical:
Very low-cost, long-duration storage
Unlike batteries:
- Storage duration is cheap to scale (just bigger tanks)
- Minimal degradation over time
- Can store energy for days or even weeks
This is exactly what wind-heavy systems need.
The Feedback Loop That Changes Everything
Once you combine:
- Cheap wind
- Cheap thermal storage
You create a powerful loop:
- Build more wind → more surplus energy
- More surplus → lower prices
- Lower prices → storage becomes more profitable
- More storage → less curtailment
- Less curtailment → wind becomes even more valuable
- More building → Learning curve
- More production of wind mills → cost curve continues to plunge
Repeat.
This is not linear. It’s self-reinforcing.
What Happens to Natural Gas?
Natural gas plants rely on:
- Running enough hours
- Capturing high-price periods
But in this new system:
- Surplus energy is absorbed by storage
- Peak demand is served by stored heat
- Price spikes are dampened
Gas loses:
- Volume (fewer operating hours)
- Pricing power (no more scarcity spikes)
It doesn’t disappear overnight — but it becomes:
A low-utilization, backup-only asset
Economically, that’s a massive downgrade.
Why This Looks Like the Endgame
This model effectively creates:
- Decoupled generation and consumption
- Fuel-free dispatchable power
- Grid-scale storage at low cost
And it does so by repurposing existing infrastructure:
- Steam turbines
- Grid connections
- Thermal systems
Instead of building entirely new systems, we are:
Rewiring the logic of the existing one
The Big Shift
The traditional power system is fuel-driven:
Cost = fuel + operations
The emerging system is capital-driven:
Cost = upfront investment, marginal cost ≈ zero
That shift changes everything:
- Pricing dynamics
- Investment incentives
- Role of legacy assets
The Aalborg / PTX_SALT Project
At a former coal site in Denmark (Nordjyllandsværket), Aalborg CSP is involved in a project that does the following:
- Takes electricity from wind turbines
- Stores it in molten salt tanks (~500–565°C)
- Converts it back into:
- steam
- electricity
- or district heating
This is part of the PTX_SALT / HeatCube system, developed with Kyoto Group.
👉 The key idea:
Use molten salt as a thermal battery charged by the grid itself ()
And crucially:
The system can reuse existing plant infrastructure — including turbines — turning it into a dispatchable renewable asset ()
Coal Plants Are Not Being Destroyed — They’re Being Rewired
This is the part most people miss.
A coal plant already has:
- steam turbine
- generator
- grid connection
- cooling system
- high-voltage infrastructure
The only thing it really needs to change is:
the heat source
Instead of:
- burning coal
- A building an expensive Thorium reactor
You:
- install molten salt tanks
- add electric heaters
- replace the boiler with a salt-to-steam system
Aalborg CSP explicitly describes this:
Coal boilers are replaced with molten salt systems that generate steam for the existing turbines — eliminating fossil fuel combustion ()
The “Carnot Battery” Concept
Technically, this is called a Carnot battery:
- Electricity → Heat → Electricity
But unlike lithium batteries:
- storage medium = salt (cheap)
- scaling duration = cheap
- lifespan = decades
You can store energy for:
- hours
- days
- even weeks
Yes, it is economically dangerous for natural gas.
Cost-Effectiveness:
The levelized cost of electricity (LCOE) for such integrated systems is reported to be around $0.106/kWh, with the potential for significant economic benefits due to improved grid flexibility and reduced renewable energy curtailment
https://www.sciencedirect.com/science/article/abs/pii/S1359431124028916
A different energy architecture
What’s emerging is not just “more renewables.”
It’s a different architecture entirely:
A system where cheap, abundant energy is stored as heat and dispatched when needed — without relying on fuel.
There is PLENTY of energy with the right engineers and manufacturing skills.
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