What strength is Borra Moretti? Great question – this lager is 4.6%, making it 3.4 units of alcohol by UK standards. Where is Birra Moretti brewed? Nowadays, this beer is brewed in various plants around Italy by the company Heineken. The recipe for Birra Moretti was created by Luigi Moretti in 1859 in his beer and ice factory located in Udine, north east Italy. Heineken bought the company in 1996.