# vacuum expectation value and Casimir effect

Is it correct to say that the VEV of the SM Higgs is 246 GeV? If so, is the VEV a reflection, or measure, of the Casimir Effect?

Depending slightly on your conventions then yes, this is correct. If you use the other convention it is $v/\sqrt{2}\approx 174\ \mathrm{GeV}$. Note that the vev is the value of the Higgs field in the vacuum, not the energy! The Higgs field itself has units of energy, but its value is not the same as its energy. To connect the two you need to know the Higgs potential.