How to Add Power to Your Base in Subnautica 2 (Oxygen Production Offline Fix)

TL;DR

• Oxygen Production Offline means your base has no power, or your power demand is higher than your supply.
• Fix it by building a power source. Solar Panels are the fastest early option and require no scanning.
• Watch the blue and red bars in the top-left corner of your screen. Blue must stay above red.
• Solar Panels give 1–8 Energy/sec but drop at night. Use them early, then upgrade.
• Hydroelectric Turbines give a constant 12 Energy/sec from underwater currents. Best mid-game upgrade.
• Bioreactors run on organic matter and give up to 20 Energy/sec. Good backup power source.
• Thermal Plants use heat vents for up to 16 Energy/sec. Best for late-game lava biome bases.
• Hydroelectric Turbines and Thermal Plants need Power Transmitters to connect to your base.

You build your first base in Subnautica 2, step inside, and see the message: Oxygen Production Offline. The inside is dark. Your air is draining just like it does underwater. What is going on?

The answer is simple: your base needs power to produce oxygen. No power equals no breathable air. This guide covers every power source in the game, how to build each one, and how to read your energy display so you never go dark again.

Why Is Oxygen Production Offline in Subnautica 2?

Power and oxygen are directly linked in Subnautica 2. As long as your base produces more energy than it consumes, the entire structure fills with unlimited breathable air. The moment your power supply falls below your power demand, oxygen production shuts off and all your interior machines go dark.

This happens for two reasons:

• Your base has no power source at all. A freshly built base generates zero power by default. You need to add at least one generator.
• Your power demand exceeds your supply. Every module you add to your base draws energy. If you add too many rooms, fabricators, or lights without adding more generators, the base will lose power even if you had it before.

To monitor your energy situation, look at the top-left corner of your screen whenever you are near your base. The blue bar shows your total energy production. The red bar shows your total power demand. Keep the blue bar above the red bar at all times and your base stays oxygenated.

How to Unlock Base Building First

Before you can add any power source, you need the Habitat Builder tool. If you have not unlocked it yet, our guide on how to unlock the Habitat Builder and start building a base in Subnautica 2 walks through the full process from scanning to crafting.

Once you have the Habitat Builder in hand, all power sources are built through it under the Exterior Facilities – Power or Interior Facilities categories, depending on the generator type.

How to Add Power to Your Base in Subnautica 2

There are four power sources in the game right now. Each one suits a different stage of your playthrough. Here is every option, in the order you will unlock them.

1. Solar Panel (Early Game)

The Solar Panel is the first and fastest way to get your base powered. It is unlocked by default the moment you get the Habitat Builder. No scanning required. You will find it under Exterior Facilities – Power in your Builder menu.

Crafting cost: 1x Titanium, 2x Quartz

Place Solar Panels on the roof of any base corridor or room. They are external fixtures, so they need open space on your structure’s surface to attach.

How much power do Solar Panels give?

• During the day at the surface: up to 8 Energy/sec.
• At night: as low as 1 Energy/sec.
• Near the surface at night: a minimum of 2 Energy/sec.
• In deep water: output drops significantly due to reduced sunlight.

There is no cap on how many Solar Panels you can place as long as you have roof space. Stacking five or more early on gives you enough power to run your base through the early game. However, Solar Panels are not a long-term solution. They are unreliable at night and useless deeper underwater. Think of them as a bridge until you get a better power source set up.

Need the quartz to build your first panels? Our guide on how to get quartz in Subnautica 2 covers all the locations. And for titanium, see our guide on how to get titanium in Subnautica 2.

2. Hydroelectric Turbine (Mid-Game — Best Consistent Power)

The Hydroelectric Turbine is the best upgrade from Solar Panels and the go-to power source for most of the mid-game. It generates power from natural underwater currents and runs at full output around the clock, day and night, regardless of depth.

Crafting cost: 3x Titanium, 3x Copper, 3x Silver

You need to find and scan two Hydroelectric Turbine fragments before you can build one. Here is where to find them:

• Fragment 1: Approximately 364 meters south-southwest of the Lifepod, near the water current behind Camp One. Look for a large natural current hugging the seafloor.
• Fragment 2: Approximately 390 meters south-southwest of the Lifepod, on a metal platform near the water current tunnel behind Camp One. A Power Transmitter fragment is usually nearby too.

Once built, place the Turbine directly inside an active underwater current. You can spot these by the blue flowing streams you see at various points in the ocean. A Turbine placed in a current generates a steady 12 Energy/sec with no fuel required.

There is no limit on how many Turbines you can place in a single current. Multiple Turbines can also share the same Power Transmitter chain, so you only need to connect a current to your base once and then add more Turbines to boost output as needed.

Connecting the Turbine to your base: The Turbine cannot be placed on your base directly. You need Power Transmitters to carry the energy across the distance. Place the first transmitter next to the Turbine, then chain additional transmitters in a line back toward your base. The final transmitter in the chain must attach to the exterior of your base to complete the connection.

Power Transmitter crafting cost: 1x Titanium, 1x Copper each.

For silver to build your Turbines, check our guide on where to find silver in Subnautica 2. For copper, see our guide on where to find copper in Subnautica 2.

3. Bioreactor (Mid-Game — Reliable Backup Power)

The Bioreactor is an interior power source. It sits inside a room in your base and generates power by consuming organic matter: fish, coral, plant matter, or pretty much anything biological you can harvest or cut with your Survival Multitool.

Crafting cost: 2x Titanium Ingots, 2x Copper Ingots

You need to scan Bioreactor fragments before you can build one. Fragments are found at science outposts and near Blackbox Signals across the map.

How much power does the Bioreactor give?

• Normal mode: 1–20 Energy/sec, depending on how full it is.
• Overcharge mode: doubles output to 20 Energy/sec but burns through organic matter faster. Useful at night when Solar Panels underperform.

The Bioreactor is essentially infinite power as long as you keep feeding it. Stock a locker nearby with fish, coral, and plant matter so you can top it off quickly after long dives. Biofuel Blocks, crafted in the Processor from Fibrous Pulp, Pents, or Crab Feces, are one of the most efficient fuels to keep on hand.

For fibrous pulp to make biofuel, see our guide on how to get fiber and fibrous pulp in Subnautica 2. If you need to build Titanium or Copper Ingots first, our guide on how to build Processors and craft ingots in Subnautica 2 has you covered.

4. Thermal Plant (Late Game — High Output Near Heat Vents)

The Thermal Plant is the most powerful passive generator in the game. It generates energy from heat sources like magma vents and geysers, making it ideal for bases in or near the lava biome and the Zezuran Desert.

Crafting cost: 3x Gold, 3x Titanium Ingots, 3x Copper Ingots

Thermal Plant fragments can be found on a cliff above the Tailing Village, approximately 500 meters from the Lifepod at bearing 110, as well as on the seabed in the same area.

How much power does the Thermal Plant give?

• Near a strong heat source: up to 16 Energy/sec.
• Further from the source: as low as 1 Energy/sec.

Place the Thermal Plant as close to a magma vent or geyser as possible to get full output. Like the Hydroelectric Turbine, it must be built outside your base and connected via a chain of Power Transmitters. The closer the Thermal Plant is to the heat source, the more power it generates, so do not place it at the edge of the hot zone.

Translucent donut jellyfish in the water are a useful visual indicator that a heat vent is nearby. Look for them when scouting Thermal Plant placement spots.

You will need gold to craft this generator. Our guide on how to get gold in Subnautica 2 covers every farming location in detail.

How to Use Power Transmitters in Subnautica 2

Power Transmitters are the cables of your power grid. Any generator that is not physically attached to your base — the Hydroelectric Turbine and Thermal Plant — needs a chain of Power Transmitters to send energy back to your base.

Here is how to set up a transmitter chain correctly:

• Place the first Power Transmitter next to your generator, not next to your base.
• Build additional transmitters in a line from the generator toward your base. Each transmitter extends the range of your power cable.
• The final transmitter in the chain must be attached to the exterior of your base to complete the connection.
• Look for the blue and white connection lines between nodes. If a line is broken or missing, you need to add another transmitter or reposition an existing one.
• Multiple generators can share the same transmitter chain. Link one current to your base and then add more Turbines to the same chain to increase output without rebuilding the cable.

Power Transmitter fragments can be found at science outposts and near Blackbox Signal locations. There is also a fragment next to the second Hydroelectric Turbine fragment location south-southwest of the Lifepod.

How to Read Your Power Display

Keeping an eye on your energy levels is the best habit to build early. Whenever you are near your base, the top-left corner of your screen shows two bars:

• Blue bar: Total energy being generated per second.
• Red bar: Total energy being consumed per second by all base modules.

As long as the blue bar is larger than the red bar, your base is powered and oxygen production is active. The moment red overtakes blue, your systems crash, oxygen shuts off, and everything inside goes dark.

Add power sources before adding new rooms or equipment, not after. Every corridor, fabricator, and light fixture draws energy. Plan ahead so you are never caught in a power deficit after a big build session.

Best Power Strategy for Each Stage of the Game

Here is the recommended progression for keeping your base powered from start to finish:

• Early game: Build 4–6 Solar Panels on your base roof as soon as you have the Habitat Builder. This keeps oxygen production online through the first hours of the game with minimal resource cost.
• Mid-game: Scan and build Hydroelectric Turbines near a natural underwater current. Connect them to your base with Power Transmitters. This gives you constant, reliable power that does not depend on sunlight or fuel. This is your primary power source for most of the game.
• Mid-game backup: Build a Bioreactor inside your base as a secondary source. Stock it with organic matter and use Overcharge mode at night or during high-demand periods when Solar Panels underperform.
• Late game: Add Thermal Plants near magma vents for the highest passive output. Connect them to your grid with Power Transmitters. Combine with Hydroelectric Turbines for a fully redundant power system that never needs attention.

Add Power Storage modules to your base walls too. These store any excess energy generated during peak production times and release it when demand spikes, acting as a buffer. This is especially useful if your base relies heavily on Solar Panels during the day.

Tips to Avoid Losing Base Power

• Never add new base modules without checking your power balance first. One large room added on top of an already tight energy setup can push you into a deficit. Add a generator before adding rooms, not after.
• Build near a natural current when choosing your base location. This makes Hydroelectric Turbine placement easy and gives you the best long-term power setup with the least effort.
• Layer your power sources. Solar Panels for the day, Turbines for constant output, and a Bioreactor as a buffer. One system covers the gaps of another.
• Keep the Bioreactor stocked at all times. An empty Bioreactor gives zero power. Keep a locker nearby with fish and plant matter so refilling it takes seconds, not minutes.
• Recharge your tools before leaving base. A powered base also lets you recharge your equipment. Take advantage of it before every dive. Our guide on how to recharge tools and batteries in Subnautica 2 covers the full process.

Frequently Asked Questions About Base Power in Subnautica 2

Why Does My Base Say Oxygen Production Offline?

Your base has no power, or your power consumption is higher than your production. Build a power source or add more generators until the blue energy bar exceeds the red demand bar in the top-left corner of your screen.

What Is the Easiest Way to Power a Base in Subnautica 2?

Solar Panels. They are unlocked by default with the Habitat Builder and cost only 1 Titanium and 2 Quartz each. Place 4–6 on your roof and you have immediate power with no scanning required.

What Is the Best Power Source in Subnautica 2?

For consistent all-day output without fuel requirements, the Hydroelectric Turbine is the best mid-game option at 12 Energy/sec per unit. For late-game players in hot biomes, the Thermal Plant edges it out at up to 16 Energy/sec. Combining both with a Bioreactor backup gives you the most stable grid overall.

Do I Need Power Transmitters for Solar Panels?

No. Solar Panels attach directly to the exterior of your base and feed power into it automatically. Power Transmitters are only needed for external generators like the Hydroelectric Turbine and Thermal Plant, which cannot be placed on the base itself.

Can I Stack Multiple Hydroelectric Turbines in One Current?

Yes. Multiple Turbines can be placed in the same water current and they will all generate power independently. They can also share the same Power Transmitter chain, so you do not need to build a separate cable for each one.

Final Thoughts

Oxygen Production Offline is one of the first roadblocks new players hit in Subnautica 2, but it is one of the easiest to fix once you understand how power works. Start with Solar Panels to get oxygen flowing immediately. Then upgrade to Hydroelectric Turbines as soon as you scan the fragments. Add a Bioreactor for backup and a Thermal Plant later when you are exploring the heat biomes.

If you are still getting your base set up, our guide on what to build in your base first in Subnautica 2 covers the priority order for every early base module. And if you want to make the most of your base right from the start, the Subnautica 2 beginner tips and tricks guide has everything else you need to survive the early game.

Subnautica 2 is available now in early access on Steam and Xbox Game Preview.