Burning grass, wood, garbage, is not a new concept at all. Most fossil burning facilities can accomodate a pretty wide variety of biomass fuels in addition to their primaries (coal, oil, natural gas).
What's odd about this is that the grass is actually being made the primary fuel, to which I can only say: "Wow! That's a whole lot of grass!". Biomass has a lower energy content than fossil fuels, and a typical coal plant burns in the hundreds of tonnes of coal per hour. You'd need equivalent mass of grass to get any useful energy out of that plant, and that's a HUGE amount of grass. Where do you grow it all? What a great way to exhaust the local soil.
Biomass is a great additional fuel, especially when trying to clear an area while powering the equipment that does so. My unexpert opinion would be that Iowans would do better with windmill farms.
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