New rules passed in a series of Iowa bills provide a use tax credit for the purchase and replacement costs incurred by an electric utility transitioning to soy-based transformer fluid. Soy-based transformer fluid is defined as a non-conductible fluid that is made of at least 98% soy-based products. The charges must be within June 30, 2006 and January 1, 2007. The credit is limited to $2 per gallon, up to 60,000 gallons. Any excess credit is refundable. (S.F. 2402, Laws 2006, Effective November 29, 2006)