relationship between device structure stability and total energy

[J.g_johnson]

I have calculate a series of data about distance between electrode and molecule vs. total energy. The total energy value is minus (e.g. -36027.50038
and -36025.88371). Can I deduce that the smaller this value, the more stable of the device structure? For example, -36027.50038 is smaller than  -36025.88371, So we can say device at former structure is more stable.

[Umberto Martinez]

Yes, you can do that.
given also that the set of calculations have the same set up (k-points, mesh cut-off, ...)