ESS provides a substitute pool for more than 750 school districts including Anderson, Greene, Kingsport, Blount and Monroe.
The COVID-19 pandemic has made this role even more important for schools, said ESS Area Manager Denise Houdeschell.
"You might have a cluster of teachers who might have to quarantine and that could be a group of five teachers out of school so it's not really a shortage, there's just a greater need," Houdeschell said.
ESS provides training led by teachers for potential substitutes. Each person will learn the protocols of the district and what to expect when entering a classroom.
The training covers areas from how to follow lesson plans to classroom management.
Houdeschell said becoming a substitute is a way to get involved in your community and to help keep kids informed and connected.
Applicants must have at least a high school diploma and must pass a background check. Districts may also require a drug test.
For more information on how to become a substitute, click here for more resources.