QBotix is selling its systems in 300-kilowatt units that include a robot, a back-up robot, steel track and tracking stands for the solar panels.

FORBES: Can Solar Robots Cut The Cost of Renewable Energy?

Acting as a lens, the rig's large water-filled orb concentrates diffused daylight or moonlight onto a solar cell with the help of optical tracking to harvest electricity.

ENGADGET: Spherical glass lens concentrates sunlight by up to 10,000 times, boosts solar cell efficiency

Sunengy has developed a liquid solar concentrated solar array that will float on the reservoir, tracking the sun to maximize energy input while using the water to keep its silicon cool.

FORBES: Napa Winery Pioneers Solar Floatovoltaics

We've been tracking the sun-powered plane known as Solar Impulse for years as it roved hither and yon.

ENGADGET

But one of the biggest breakthroughs in clean energy was actually in solar power, as designers at Rawlemon created a spherical, sun-tracking glass globe that's able to concentrate sunlight (and moonlight) up to 10, 000 times.

ENGADGET: Inhabitat's Week in Green: go-kart made of Lego bricks, TOTO toilet bike and the launch of 'Willow Glass'

Pernick and Wilder chart this migration over the past half decade or so by tracking several trends, including public and private sector investment, installed solar and wind capacity and similar signs of scale.

FORBES: Clean Tech Nation: The Scramble for Clean Tech Supremacy

The Index is a rules-based, modified global-capitalization-weighted, float-adjusted index intended to give investors a means of tracking the overall performance of a global universe of listed companies engaged in the solar energy industry.

FORBES: Obama Shines On Solar, ETFs Will Benefit

Solar power plants can have up to hundreds or thousands of arrays, each with its own tracking motor and other mechanical parts prone to failure.

FORBES: How Robots Are Making Solar Power Cheaper

His family's Pittie Enterprises group has tied up with two U.S. firms, SunPower Corp. to make and market cells, and American Sunco to develop tracking systems which ensure maximum sunlight for the U.S. partner's solar thermal and photovoltaic modules.

CNN: Recasting the Mind