Once tidal power plant is built its’ electricity is free.
It does not emit greenhouse gasses, carbon emission gasses which pollute environment.
It does not have any dependency of any fossil fuel including furnace oil, gasses, etc; it needs no oil what so ever to produce electricity.
Tidal power technology is renewable energy, which uses tidal and waves of same water for producing electricity over and over again.
Tidal power technology like all renewable energy is clean energy and does not leave much impact on environment.
Tidal power plants does not require much maintenance, therefore it is maintenance cost free.
Tidal energy stations have about 80 % efficiency ratio, where as fossil fuel have approximately 30 % for efficiency levels.
Tides in oceans are very predictable, its easy to judge when strong tides are going to show up from water consider weather and other conditions.
The better tides and wave strengths of the oceans is, improved the efficiency of the station is.
Electricity does not fluctuate on large scale using tidal energy as it happens in solar power technology.