It has emerged that in the case of projects contracted through to 2011, BNDES is prepared to offer finance to developers using equipment from Vestas, Suzlon, Acciona and other major overseas producers currently deemed ineligible by the bank on suspicion of not meeting its 60% minimum national-content level.

But the finance would be at a higher interest rate that could make some projects unviable given the tight margins developers are working on.

The