There are two other State Parks near the Dells - Mirror Lake and Rocky Arbor. Access the Wisconsin DNR site:
Wisconsin Explorer Program - WDNR
Triguy is right; it may be difficult to get an electric site at a state park in Wisconsin, especially on a weekend. We have this goofy state law restricting the number of electric sites allowed at state parks. It's antiquated, and was pushed through by the private campground lobbyists so state parks don't compete with private campgrounds. Just my opinion, but I'd rather stay at a state park. Less kids, more trees and more natural settings. There are a ton of private campgrounds in the Dells area, but I don't consider a picnic table in the middle of a field an ideal camp site! Kohler Andrae (Sheboygan; on Lake Michigan) state park recently added about 30 sites and six (6!) of them are electric sites. I think it's a law that needs to be changed, but when going up against a powerful lobbyist group, what can you do? It is what it is.....good luck!!