The Supreme Court of Justice of the Nation (SCJN) in Mexico has blocked the nationwide introduction of E10, the blend containing 10% ethanol, until the full impact on the environment is studied.

In a recent ruling, the court says the move by the Energy Regulatory Commission (CRE) to unilaterally modify the rule governing ethanol content in gasoline so as to allow a 10% share is unconstitutional. It further says the economic benefits of such a decision have to be weighed against the potential risks for the environment.

Before CRE’s modification of the fuel rule, the maximum ethanol content in gasoline allowed in Mexico stood at 5.8%. It will return to that level following the court decision, but there will be a 180-day buffer period for companies affected by it.

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