If your Subnautica thermal plants suddenly stop spinning, show heat values like “12,” or refuse to power your base, you’re not alone. A lot of players run into this frustrating Subnautica power bug after expanding their base or adding new generators.
The confusing part is that everything can look correct — the turbines are connected, the heat source is active, and the power transmitters seem fine — but your base still gets no energy.
Fortunately, this is usually a known Subnautica thermal plant bug rather than a permanent issue with your save. Here’s what causes turbines not spinning in Subnautica and the fixes that players say work most often.
Quick Fix for Subnautica Turbines Not Spinning
If you want the fastest solution first, try these steps in order:
- Rebuild the power transmitter closest to your base
- Save and fully restart the game
- Deconstruct and rebuild the broken thermal plants
- Disconnect other power sources temporarily
- Check the heat zone placement
For most players, rebuilding the nearest power transmitter immediately fixes the Subnautica thermal plant not working bug.
Why Your Subnautica Thermal Plants Aren’t Working
The most common cause is a power grid desync issue.
Basically, Subnautica detects the thermal plant’s heat source but fails to update the power network correctly. When this happens, you’ll often notice:
- turbines not spinning
- thermal plants showing heat but no power
- bases not receiving electricity
- connected power transmitters doing nothing
- new turbines failing while old ones still work
This bug has been reported for years across Reddit, Steam forums, and community discussions, especially after:
- expanding a base
- building additional generators
- moving power transmitters
- loading older saves
- mixing multiple power systems together
Fix 1: Rebuild the Power Transmitter Closest to Your Base
This is the most reliable fix according to community reports.
If your Subnautica base is not receiving power even though your thermal plants are connected, try rebuilding the final power transmitter in the chain.
How to do it
- Find the power transmitter nearest your base
- Deconstruct it completely
- Rebuild it in the same spot
- Wait a few seconds for the power grid to refresh
Many players say their turbines immediately start spinning again after doing this.
Subnautica’s power routing system can sometimes bug out, and rebuilding the last connection forces the game to recalculate the entire energy network.
Fix 2: Rebuild the Bugged Thermal Plants
If rebuilding transmitters doesn’t work, the thermal plants themselves may be stuck in a bugged state.
This is especially common when:
- adding new turbines near existing ones
- moving generators repeatedly
- loading older worlds
Steps to fix bugged turbines
- Deconstruct only the non-working thermal plants
- Save the game
- Fully restart Subnautica
- Rebuild the turbines from scratch
Simply moving the plant usually doesn’t fix the issue. Players report that a full rebuild works much more consistently.
Fix 3: Disconnect Other Power Sources
Subnautica’s power priority system can behave strangely when multiple generator types are connected together.
If your base uses:
- Solar Panels
- Bioreactors
- Nuclear Reactors
- Thermal Plants
…the game may prioritize older power sources while ignoring newly placed thermal plants.
This can make it seem like your turbines are broken even though the issue is actually a power routing conflict.
What to try
- Disconnect solar panels temporarily
- Remove unused bioreactors
- Test thermal plants by themselves
- Reconnect other generators afterward
A lot of players discover their thermal plants start working normally once the grid is simplified.
Fix 4: Check the Thermal Plant Placement
Sometimes the issue really is the heat source.
Even if the thermal plant displays a temperature number, the area may not produce enough heat for stable energy generation.
Best locations for thermal plants
Thermal Plants work best near:
- lava vents
- geysers
- volcanic zones
- deep thermal areas
If your first few turbines work perfectly in the same spot while newer ones fail, though, placement probably isn’t the main problem.
Fix 5: Restart the Game Completely
It sounds simple, but this fix works surprisingly often.
Long play sessions can cause Subnautica’s power systems to stop updating properly. Saving your game, fully closing Subnautica, and reloading your save can refresh the power grid.
Some players report the turbines start spinning again immediately after restarting.
Why New Thermal Plants Stop Working While Old Ones Still Work
This is one of the biggest clues that you’re dealing with the Subnautica thermal reactor bug rather than incorrect placement.
If:
- old turbines work normally
- new turbines show heat values
- transmitters are connected
- moving turbines changes nothing
…then the issue is almost always tied to the game’s power network desync system.
In most cases, rebuilding the nearest transmitter and refreshing the grid fixes the problem.
Best Overall Fix for the Subnautica Power Bug
Based on community testing, this combination has the highest success rate:
- Remove the nearest power transmitter
- Rebuild it
- Save and restart the game
- Rebuild broken thermal plants if needed
That usually restores power generation without needing to rebuild your entire base.
FAQ
Why are my Subnautica turbines not spinning?
The most common reason is a power-grid desync bug where the game recognizes the heat source but fails to update the connected power network.
Why is my thermal plant showing heat but no power?
This usually means the thermal plant detects a valid heat source, but the power transmitter network has bugged out.
Why is my Subnautica base not receiving power?
Broken transmitters, power routing conflicts, or bugged thermal plants are the most common causes.
Do thermal plants need power transmitters in Subnautica?
Yes. Unless the thermal plant is placed very close to your base, you’ll need power transmitters to carry energy back to the habitat.
Can Subnautica thermal plants bug out?
Yes. It’s a long-running issue reported by many players, especially after base expansion or adding multiple generators.
How do you fix the Subnautica thermal plant bug?
The most effective fix is rebuilding the power transmitter closest to your base, then saving and restarting the game.