I assume Tesla was just trying to be cheap. As soon as the water supplier said Teslas expected demand (372 m³ per hour) wouldn't be possible, the demand suddenly shrank to 243 m³ per hour. So my guess is that Tesla tried to reduce capex by employing more wasteful water usage but now has to work more efficiently. https://www.quarks.de/umwelt/wie-problematisch-ist-der-bau-v...