Logo Design for e-mobility start-up

Contest Brief

Hi Designers,

We need a company logo with identifier and skyline for our start-up e-mobility company.
The company name is "mobility4fun".
The logo should contain a symbol/graphic element which can be used separate as identifier for product labeling, App Icon, Web shop and - site.
A short version "m4f" is also required.
We are offering electric based innovative and high quality mobility solutions.
Mobility driven by green energy (solar, wind, renewables) is our passion and we will impress and convince everybody about the fun factor driving innovative e-vehicles, zero emission.
We provide guided tours with innovative mostly electric driven vehicles (like Segway, Solowheels, E-Bikes,...).
Most of these vehicles are also for rent and or for sale.
To provide most comfort, reliability and innovation, we are developing our own devices (like e-motor controller, LCD-Cockpit to control and monitor the entire e-system) and build e-bikes, e-trikes and other e-vehicles equipped with the best and most advanced components.
Hightech, innovation, reliability meets fun in conjunction of green power. The challenge is to unify this in the logo providing a unique face and character for our label.
Our idea is to get a logo "mobility4fun" and short version "m4f" -> "the innovative way to move" containing mostly the colors green (for green energy, nature), blue (for blue clear clean sky or fresh water) and yellow/orange (for the sun providing clean energy, light and fun).
We did a DIY try on http://www.mobility4fun.de
The logo/layout design should be modern and clear like our product design.

We need the logo in different file formats for print, web and media.
File formats: AI, EPS

Looking forward to participate your ideas, impressions and inspirations.

Edit 19-03-2013: I removed the demand for Cologne-Skyline integration. Pls get rid of that. I don't like to overload the logo design.
Edit 21-03-2013: Upload plug and jack as example for "electricity" association. This example is not from this contest.

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