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Yes, because atmospheric density at the surface of Venus is 67 kg/m^3m, about 55 times as dense as sea level atmosphere on Earth: https://en.wikipedia.org/wiki/Atmosphere_of_Venus#Tropospher...

Wikipedia says:

> Savonius turbines are used whenever cost or reliability is much more important than efficiency.

The German article is a bit more detailed and claims that Savonius tubines are effective at speeds as low as 2m/s and produce high torque even then. Maybe the high pressure on Venus increases this effect?

With sufficient gear reduction any wind at all is enough to wind a spring, albeit slowly.