A US Senate subcommittee will conduct a hearing in September on Google’s search/business practices.

The hearing, titled “The Power of Google: Serving Consumers or Threatening Competition?,” will take place on September 21, 2011, at 2:00 pm ET. It appears that a webcast will be available via the Senate Judiciary Committee’s website.

The witness list hasn’t been posted there yet, but this is presumably the hearing at which Eric Schmidt has agreed to testify.

Senator Herb Kohl, chairman of the Subcommittee on Antitrust, Competition Policy and Consumer Rights, will preside over the hearing.