In general, the open market finds the most efficient use of energy, and in general, that's how I feel about managing energy. If you subsidize the energy consumption of farmers, you might hurt them in trade access or something like that.
However, I would comment that low-input agronomy isn't a place where you can get a lot of industry support for your research program, so I think it is an area where you need some kind of public investment. I would put a plug in there for the Martin Entzes of the world.