Massachusetts has suspended a rule that would have required a minimum content of biofuel in heating oil and diesel fuel sold in the state
, according to reports by the Boston Globe.

The Clean Energy Biofuels Act, which was scheduled to take effect last week, requires a minimum percentage of biofuel, starting at 2 percent this year and ramping up to 5 percent by 2013.

The legislation, signed in 2008, gives preferential tax treatment to non-corn-based alternatives to ethanol, and proposes a new fuel standard for the region that will encourage a range of emissions-reducing technologies for cars and trucks.

However, the state suspended the law because officials felt it would impose "unreasonable" costs on consumers and businesses, particularly those smaller companies that would be subject to the regulation, according to reports by the GateHouse News Service.

The state decided instead to make the program voluntary.