TeamCity vSphere integration allows using TeamCity agent cloud features with VMWare vSphere installation. It requires configuring TeamCity with your VMWare vSphere account and then handles automatic creation/starting/stopping/deleting of the virtual machines with TeamCity agents on-demand, based on the queued builds.
Before you can start using vSphere integration, you need to create a Virtual Machine with the TeamCity Build Agent installed and set to start automatically. Also, you need to manually point the agent to an existing TeamCity server with the vSphere plugin installed and start build agent to let the build agent download the plugins.
Install the plugin as described here
TeamCity Versions Compatibility
The current build status is
Detailed CI status page