Commercial Description In 1959, on the 200th anniversary of Arthur Guinness signing the lease on St. James Gate Brewery, we invented nitrogenated stout. We capture the rich aromas and flavors of dark roasted barley, but also created an eminently approachable and drinkable beer. In 2015, we are doing with IPA what we did with stout 56 years ago. Guinness Nitro IPA. Supremely smooth, unmistakably Guinness. ABV: 5.8%