If idealism played a role in starting 1366 Technologies, the business plan is all about cold, hard numbers. The 20-person start-up has an ambitious economic target: to make solar cheaper than coal in three years. That means producing silicon solar cells at less than $1 per watt, cutting the current costs by about half. more

Blogger Eric Wesoff has revisited his list of 150 Solar Startups and updated the count to 200. In his six-part blog piece he grouped them into
Wafered Silicon, Installers, Financiers, Balance of Systems
CPV
Next-Gen PV
Thin Film
Solar AC and CHP
CSP

read all about it here.