  We present new superalgebra for $\mathcal{N}=2$ $D=3,4$ supergravity theory
endowed with the $U(1)$ generator. The superalgebra is rooted in the so-called
Soroka-Soroka algebra and spanned by the Lorentz $J_{ab}$ and Lorentz-like
$Z_{ab}$, translation $P_a$ and $T$ generators, as well as two supercharges
$Q^I_\alpha$. It is the only possible realization for a given generator
content. We construct a corresponding 3D Chern-Simons supergravity realization
of the superalgebra and discuss its relevance.

High Energy Physics - Theory;General Relativity and Quantum Cosmology