As above, current version is way overpowered compared to everything else. If coding variable wind power is too hard for you, I suggest these stats:
Tier 1:
51 kW output (effectivity = 0.1)
Recipe: 1 Engine
5 Electronic Circuit
5 Iron Gear
10 Steel
Total Raw Resources: 74 Iron, 7.5 Copper
Tier 2:
408 kW output (effectivity = 0.8)
Recipe: 1 Wind Turbine (previous tier)
5 Advanced Circuit
10 Iron Gear
10 Steel
Total Raw Resources: 154 Iron, 32.5 Copper, 10 Plastic
Tier 3:
2 MW output (effectivity = 4)
Recipe: 1 Wind Turbine 2 (previous tier)
5 Processing Unit
10 Iron Gear
10 Steel
Total Raw Resources: 385 Iron, 232.5 Copper, 30 Plastic
This way tier 1 turbine is more expensive than solar panels, but provides constant power,
and upgrading to higher tiers is cheaper than building more of lower tiers, with reasonable power output.