21. The generation of electricity from the bay's tidal currents was ultimately accomplished in September 2012. 22. Because the sound is long, and in places narrow, the tidal currents are fairly strong. 23. However, tidal currents occur in narrow passages in the western parts of the Baltic Sea. 24. Studies suggested that tidal currents around and between the lagoons would become extremely fierce and damaging. 25. The northern entrance, has strong tidal currents , which are affected by strong northerly or southerly winds. 26. The strait is characterized by strong tidal currents , that established a migration of many bird species. 27. Tidal currents vary from one to two knots.28. Cook Strait's nautical chart offers tidal current information. 29. The incoming tidal currents carry more sediment into the estuary than the ebb tides carry out. 30. The strait is subject to strong tidal currents which reverse direction approximately four times a day.