Sentinel Data Centers wants to build a 160-acre site near Lowell, Indiana.
It is expected to bring jobs and tax revenue, but also raises concerns about water and power use.
A rally is planned for 5 p.m., followed by a town hall at 6 p.m. at Lowell High School.
SEE ALSO: More data centers coming to Illinois as residents complain about noise, electric bills: What to know
Lake County (Ind.) has delayed a rezoning vote until next month.