While horizontal wind turbines have improved efficiency dramatically in recent years, have come down in price, require less wind for operation and are much quieter, it's the vertical turbines that have really grabbed my interest.

Vertical axis turbines until recently

were as ugly as their horizontal axis counterparts and not as efficient; but that appears to have changed with newer models hitting the market. According to manufacturers, the benefits of a vertical axis wind turbine such as the design above over horizontal axis designs include:

• can be used in suburban settings
• lower profile for use on rooftops more aesthetically pleasing; but I guess this is a matter for personal taste.
• may not be subject to the number of regulations of their horizontal counterparts
• lower noise
• no vibration
• operate effectively with wind coming from any direction
• shorter towers mean less cost and fewer materials
• lower maintenance and repair cost as there are fewer moving parts
• easily visible to wildlife. When spinning or at rest, they appear as a solid object
• self regulating spin speeds in high wind events
• produce energy at lower wind speeds

One possible disadvantage is in relation to the fact they don't require a tall tower as wind speeds can be less at ground level. Simple solution - build the tower you were going to need anyway if you were set on using wind power.

I think I'd much prefer seeing the vertical axis wind turbines dotting the landscape. If you're considering implementing a wind turbine soon, this is perhaps an option well worth looking into. Don't forget to check out renewable energy rebates available to you as these incentives can greatly decrease the cost!