On March 22, Senate Energy and Natural Resources Chairman Ron Wyden (D-OR) sent a letter to the Environmental Protection Agency (EPA) requesting data to explain volatility in the market for renewable identification numbers (RINs). He asked the EPA to provide data on market volatility, irregular trading, deficits and surpluses in RINs carried over from the previous year, as well as production and consumption of biofuels in the U.S.