Running out of power in Subnautica 2 is not a gentle inconvenience. When your base goes offline, oxygen replenishment stops, machines shut down, and everything you built to survive the depths of Proteus becomes a very expensive paperweight. Unknown Worlds Entertainment launched the game into Early Access on the Epic Games Store, and players are quickly learning that base power management is one of the first systems that demands real attention.
The good news: there are five distinct power sources in the game, each suited to different stages of your playthrough and different biomes. The less good news: picking the wrong one early can leave you scrambling for materials you don't have yet.
Solar panel on base exterior
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Why power is the first thing that breaks your base
The power threshold is visible in the upper-left corner of the screen. Keep enough power flowing and your base fully replenishes oxygen while you're inside. Let it dip into deficit and the whole facility goes dark. That means no crafting, no oxygen recovery, and no respawn point if you're running a Biobed.
Here's the thing: new players often build a base before they have access to the better power options, which means they lean on Solar Panels longer than they should. Solar Panels generate between 1 and 8 energy per second, which sounds fine until you stack a Fabricator, a Processor, and a Scanner Station in the same hab. At night, or at any depth where sunlight doesn't reach, Solar Panels produce nothing.
The five power sources and what they actually cost
Every power source in Subnautica 2 has a different material cost, energy output, and placement requirement. Here's the full breakdown:
The Power Transmitter is worth calling out separately. It doesn't generate energy on its own. Instead, you chain multiple transmitters from a cluster of generators back to your base exterior, which is useful when your best power sources are too far from your hab to connect directly.
Which power source fits which stage of the game
Solar Panels make sense as a stopgap. They're cheap (1x Titanium, 2x Quartz) and require no rare materials, so you can get something running while you scout for better options. The moment you have access to Silver or Gold, though, it's worth transitioning.
The Thermal Plant is the standout option in the Zezuran Desert biome, where geysers and hydrothermal vents are common. At up to 16 energy per second, it outpaces the Hydroelectric Turbine in the right environment. The catch is that you need Gold, which takes longer to source than Silver.
The Bioreactor tops out at 20 energy per second and sits inside your base, meaning it's protected from the environment. The trade-off is that it runs on organic materials, so you need a steady supply of fauna or flora to keep it fed. For players who spend a lot of time exploring and collecting, this is a natural fit.
Bioreactor inside base interior
Getting the base right before you worry about power
Power decisions don't happen in a vacuum. Where you build your base determines which power sources are even available to you. A base in a shallow, sunlit zone can lean on Solar Panels temporarily. A base near a current can go straight to Hydroelectric Turbines. A base in the Zezuran Desert should prioritize the Thermal Plant.
What most players miss is that base location and power strategy are the same decision, not two separate ones. Scouting your build site for nearby currents or thermal vents before you lay down your first corridor saves a lot of backtracking.
For players still getting their footing with the construction system itself, the Subnautica 2 base building and habitat builder guide covers how to unlock and craft the Habitat Builder, which is the tool you need before any of this is even possible. If you want a full rundown of oxygen management alongside power, the Subnautica 2 oxygen and power guide is worth bookmarking before your next dive.
