For perspective on how much black liquor is produced, one third of all pulping mills in the United States produce 6 million lbs/day of black liquor each. The black liquor is typically 15-20% solids by weight and these so-called "black liquor solids" contain about half the energy of the original woodchips. The older method to recover this energy involved concentrating the solution to about 75-80% solids by weight and then burning in a recovery boiler to generate steam. A gasification system, however, can feed the liquor into a high-pressure gasifier to produce electricity, steam, or potentially any other gasification product. This solves many of the difficulties associated with feeding other biomass feedstocks.