Hooking up smart thermostat.

I need a C wire as everyone knows. In the wall at my thermostat, there is a coiled blue wire. At the unit in the attic, the coiled blue wire is combined with the red wire from outside ac and a wire that goes to ground. Does that mean that the blue coiled wire at my thermostat has power I could use as my C wire? Side note, there is no C on my control board. Thanks!