When the game starts in a Ceres map, The obsidian at core lava biome is cool, and some of it can be even cooler than 300°C, despite molten magma (1409.9+°C) spawns next to it. This cools the magma there quickly. Usually, when a normal player reaches the biome, all magma has already been cooled to igneous rock. This makes geothermal power inefficient in Ceres maps.
Steps to Reproduce
Enable debug or sandbox. Generate a Ceres map (without frozen/lush core), and pause the game instantly when the game starts. Reveal the map, and go to core magma biome, you probably see the cool obsidian spawns adjacent to molten magma. Wait for some time, molten magma probably turn to solid igneous rock.

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