MONACA, Pa. (AP) — Shell Chemicals officials says the multi-billion-dollar petrochemical, or ethane cracker, plant in Potter Twp. is expected to be completed next year. The company said in a statement Tuesday that the company is now in the early stages of commissioning and start-up activities. Shell CEO Ben Van Beurden said in an earnings call last month that the complex, now more than 70 percent complete, would likely be “fully operational” sometime in 2022. The plant will break down — or crack — ethane molecules to produce pellets that can be used to make various plastics for products ranging from automotive parts to food packaging.