The biodiesel tax credit will expire in December if not renewed. Senator Charles Grassley (R-IA) has proposed legislation, co-sponsored by 13 other senators, that will shift how it is applied. In Brazil, the tax exemption for ethanol sales also expires in December, and a change could occur there as well.Discussion of tax extenders, especially for renewable energy, and work on what might go into a bill has already begun as Congress has basically scheduled a great deal of time out of Washington. It will return for the month of September and adjourn by 1 October for the 2016 election. There will then likely be a lame-duck session in December to finish appropriations and consider a tax extender bill. During that month last year, there were five...