he capital investment cost for a switchgrass-fueled ethanol plant with a capacity of 250000 galoons per year 3 millon dolar. The cost capacity of factor for this particular plant technology is 0.59 for capacities ranging from 200000 gallons per year to 500000 gallons per year. What is the estimated capital investment for a similar ethanol plant with a capacity of 500000 gallons per year?