For the given PDE system how do I find the total energy without having to calculate the complete solution?

I've tried equating $E(0)$ and $E(\infty)$ using the steady-state solution, but to no avail.
For the given PDE system how do I find the total energy without having to calculate the complete solution?

I've tried equating $E(0)$ and $E(\infty)$ using the steady-state solution, but to no avail.
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