Not as the economics are currently configured. First of all, this is biomethane, which is different from biodiesel, just as a point of clarification. Currently, biomethane is more expensive than conventional natural gas. If, however, we start taking account of the environmental impact and that's priced in, whether through a carbon tax or some other form, then they start getting more cost competitive. But currently it is a premium product and is more expensive.
On February 12th, 2013. See this statement in context.