Bridges, highways and sewer systems are built by private companies but often paid for through the use of tax-free municipal bonds. Such projects are typically guaranteed by the tax authority given to those municipalities issuing the instruments and therefore assuring the debt holders that they will be paid in full.

"It opens the doors for those consumers who can't bear the burden of the investments. They agree to take the power but not to put up the capital." -- Paul Fenn, Director, Local Power