“Is this price [of around R$110 ($47) per MWh] sustainable? Is it economically interesting for the industry and for investors? Are the rates of return sustainable? These are the questions which all of us ask, and I don’t know the answer,” Fiúza told the Brazil Windpower 2013 conference.

For Fiúza, the real price at the last auction — if you take away the effect of the new P90 rules, which he estimates as increasing the final price by 10% — was R$99.38.

“There