Yes, tidal turbine steam generators are a good idea, because they produce a lot of energy with little environmental costs. There are few environmental costs involved with tidal energy. There are far fewer risks with tidal energy than there is with harvesting fossil fuels, or even with nuclear energy. It should be encouraged and developed as a technology with a lot of potential.
Yes, tidal turbine steam generators are a good idea, because they produce energy that is clean. There is very little impact on the environment. Really, the steam engines just harvest the energy and graviational pull that is already there. Tidal turbines are a good way to generate clean energy at a reasonable cost, and should be encouraged.