Factories, Coal Plants, Solar Plants, Hydro Plants

[mrmichaeln]

Do Solar Plants neutralize the effect of Coal Plants, meaning are they redundant?

What about Hydro Plants? Is there any point in creating a Solar Plant if you already have a Hydro Plant?

With the Hoover Dam Great Wonder, do you need to have a factory in your city before you get its benefits?

Thanks for all your help!

[Kloreep]

All Power Plants are redundant. You can have more than one in a city if you want, but only one will have an effect.

Hydro Plants are basically inexpensive Solar Plants, so no, don't bother with a Solar Plant if you have a Hydro Plant.

Yes, you do need a factory to get the benefits of any power plant, including free Hydro Plants from the Hoover Dam.

[Gramphos]

They replace each other. Yuo can't have more than one. Building a new will cause an old to be sold, unless given by a woner in which case you also may build another that overides the one given by the wonder.