  We study the representation theory of a hybrid quantum group at root of unity
$\zeta$ introduced by Gaitsgory. After discussing some basic properties of its
category $\mathcal{O}$, we study deformations of the category $\mathcal{O}$.
For subgeneric deformations, we construct the endomorphism algebra of big
projective object and compute it explicitly. Our main result is an algebra
isomorphism between the center of deformed category $\mathcal{O}$ and the
equivariant cohomology of $\zeta$-fixed locus on the affine Grassmannian
attached to the Langlands dual group.
