Grids broken v1.2.11. Was working fine. Loaded the save and found most connections on the grid were gone. As in the solar panels, wells, and battery arrays are sitting on the grid without the connectors being hooked up, which makes them unusable by the grid. The only weather since building the grid has been lightning storms, but all disconnected structures show 100% health. With no way to fix the somehow disappeared connectors, the only way to fix the problem is to tear down and rebuild everything resulting in both significant time and resource (stored electricity and water) loss. Reading forums seems to imply everything can simply break again for no known reason. Steel Grids are now unusable in stable game play.
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