The Cinergy Children’s Museum is all new. It has a new home, new exhibits and new ideas. It opens Saturday at Cincinnati Museum Center at Union Terminal.

It grows out of the success of the Children’s Museum of Cincinnati that opened in Longworth Hall on Pete Rose Way, Nov. 4, 1994. Interactive exhibits, including ‘‘Sounds Around,’’ ‘‘Shapes Relate’’ and ‘‘The Works’’ involved children in learning experiences with more than 200 hands-on activities.

The museum attracted 150,000 visitors in its first year and, by the time the museum was closed by the Ohio River flood of March 1997, 250,000 visitors had passed through its doors. Cinergy Children’s Museum, which cost $7.5 million to build, is expected to attract at least 200,000 visitors a year.

Six months before the flood, the Children’s Museum announced its merger with Cincinnati Museum Center, joining the Museum of Natural History & Science, the Cincinnati History Museum and the Robert D. Lindner Family Omnimax Theater.

The new museum would occupy 30,000 square feet of space under the terminal, which was intended for a parking garage when the railroad station was built in 1933. It is below the U-shaped driveway, steps and fountain in front of the building.

A temporary Children’s Museum, using exhibits rescued from the flooded museum, opened at Museum Center June 24, 1997. Groundbreaking for the new Children’s Museum under Union Terminal occurred the same day.

The Longworth Hall museum occupied 33,000 square feet on three floors, half of it devoted to exhibitions. With 27,000 square feet devoted to exhibitions, the new museum is almost twice the size of its predecessor.

It is designed for children up to age 10. All exhibits and restrooms are wheelchair accessible.