Superior performance of Mukherjee's state-specific multi-reference coupled-cluster theory at the singles and doubles truncation scheme with localized active orbitals

► Mukherjee's state-specific multi-reference coupled-cluster theory is studied. ► Superior performance if localized active orbitals are used. ► Significant improvement both in terms of absolute and non-parallelity errors. ► Using localized orbitals it is an accurate theory for potential energy surfaces.