Brattøra in the Midnight Summer TrondheimBrattra in the Midnight Summer Trondheim. This is a modernized part of Trondheim's city with new designs and modern buildings such as powerhouse. Brattra is an artificial island in the city of Trondheim in Trndelag county, Norway. The 0. 485 square kilometer (120 acre) island is located at the mouth of the river Nidelva just north of the city center (Midtbyen), west of Nyhavn, and south of Trondheimsfjord. There is a canal that divides the mainland