Make the sentence fluent: Also since a wind turbine or solar panel are more unlikely to be in a terrorist's hit list than a nuclear plant, cost of maintaining security of them are relative less.
The cost of maintaining security of a nuclear plant is less than the cost of maintaining security of a wind turbine.

• I think this is a good answer. I'm not sure if it's a good answer, but I'm not sure if it's a good answer. – user123456789 Sep 11 '14 at 16:38
• @user123456789: I think the answer
The wind turbine is more likely to be in a terrorist's hit list than a nuclear plant.
The wind turbine is more likely to be in a terrorist's hit list than a nuclear plant.
The wind turbine is more likely to be in a terrorist's hit list than a nuclear plant.
The wind turbine is more likely to be in a terrorist's hit list than a nuclear plant.
The wind turbine is more likely to be in a terrorist's hit list than a nuclear plant.