Motorcycles are by definition efficient machines, but their Prius-like fuel economy often is accompanied by emissions that make a Hummer look clean. As regulators get wise to that fact and go after two-wheelers, the motorcycle industry is embracing alternatives ranging from battery power to hydrogen fuel cells.

Luckily for green motorcycle enthusiasts, there have been huge advancements in battery technology, and this has spurred the creation of a variety of electric motorcycles. Many of these batteries are super durable, and they can last up to 10 years, making them a great alternative to traditional gas-powered motorcycles. So, what are some of the greenest motorcycles both on the market and in concept phase today? Here are three you can buy right now and more coming on the market soon:

Electric and alternative-fuel bikes are the future of individual transportation not because of their fuel efficiency but because they are extremely cool. That's right. Creators of eco-friendly motorcycles are pushing the limits of their designs to make them desirable to a biking community that sees little difference between their (relatively) efficient gas engines and the new-fuel wave of alternatives. Riding bikes is all about the cool factor, so the crazier and more technologically advanced they get, the more people will want to ride them, clean fuel or not.

Jake Loniak, a student of Art Center Pasadena has crammed the combination of motorcycle and tech-skeleton into an awesome looking Yamaha branded Deus Ex Machina. Jake has beyond his wild imagination to design this concept.
The vehicle will be powered by ultra-capacitors and doped nano-phoshpate batteries. Jake believes that this vehicle can achieve a top speed of 75 mph. The recharge time of this vehicle is15 minutes and cycle time is of 1 hour.

The Killacycle is the fastest electric drag bike in the world.
0-to-60 in 0.97 seconds, 400 horsepower, and a top speed of 158 mph. Scotty Pollacheck on the KillaCycle set the overall world record for an electric vehicle in the 1/4 mile, once again, while Eva Hakansson on her ElectroCat set the 48 volt division street-legal electric motorcycle record. What a perfect birthday present for me at Bandimere Speedway.