for example the equipment cost for a 10 kw wind turbine costs roughly $ 40000 while a 100 kw turbine can cost more than $ 350000 according to bergey com the average wind turbine can cost $ 48000 to $ 65000 to install
The boats can typically travel at speeds over 80 knots (150 km/h) in calm waters, over 50 knots (90 km/h) in choppy waters, and maintain 25 knots (47 km/h) in the average five to seven foot (1.5 to 2 m) Caribbean seas. They are heavy enough to cut through higher waves, although at a slower pace.
Your question mentioned the 'average' sailing boat of about 30 ft LOA. Well if you think in terms of distance sailed in 24 hours, it will give you a good idea of average speeds that are sustainable. Any run of less than 100 miles in 24 hours is depressing (less than ave 4.1 knots) but not unusual in light airs.