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Now Available: 50 Disruptive Companies 2013 See The 2013 List »

The 50 Most Innovative Companies 2011

Energy

Public Companies

A123 Systems

Why: Lithium-ion batteries make electric cars possible at mass-market prices.
Key innovation: Nanostructured electrodes result in lithium batteries more durable and safer than those in cell phones and laptops.

Amyris

Why: Advanced biofuels could help reduce the use of gasoline and diesel.
Key innovation: Its genetically engineered yeast turns sugars into a building block of diesel fuel, which is usable in the existing transportation infrastructure.