Use windmill.

src/smg_server.cpp

@@ -146,6 +146,7 @@ private:
         auto wind = m_wind / 8.3;
         auto renewable = (sun + wind) / 2;
         m_modell.set_solar_plant(sun);
+        m_modell.update_windmill_speed(wind);
         m_modell.set_windmill_net(wind);
         m_modell.set_renewable_net(renewable);
         if (m_production.conventional > 0)