diff --git a/plugins/MRPT_Utils/EZFIO.cfg b/src/MRPT_Utils/EZFIO.cfg
similarity index 100%
rename from plugins/MRPT_Utils/EZFIO.cfg
rename to src/MRPT_Utils/EZFIO.cfg
diff --git a/plugins/MRPT_Utils/H_apply.irp.f b/src/MRPT_Utils/H_apply.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/H_apply.irp.f
rename to src/MRPT_Utils/H_apply.irp.f
diff --git a/plugins/MRPT_Utils/NEEDED_CHILDREN_MODULES b/src/MRPT_Utils/NEEDED_CHILDREN_MODULES
similarity index 100%
rename from plugins/MRPT_Utils/NEEDED_CHILDREN_MODULES
rename to src/MRPT_Utils/NEEDED_CHILDREN_MODULES
diff --git a/plugins/MRPT_Utils/README.rst b/src/MRPT_Utils/README.rst
similarity index 100%
rename from plugins/MRPT_Utils/README.rst
rename to src/MRPT_Utils/README.rst
diff --git a/plugins/MRPT_Utils/energies_cas.irp.f b/src/MRPT_Utils/energies_cas.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/energies_cas.irp.f
rename to src/MRPT_Utils/energies_cas.irp.f
diff --git a/plugins/MRPT_Utils/excitations_cas.irp.f b/src/MRPT_Utils/excitations_cas.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/excitations_cas.irp.f
rename to src/MRPT_Utils/excitations_cas.irp.f
diff --git a/plugins/MRPT_Utils/fock_like_operators.irp.f b/src/MRPT_Utils/fock_like_operators.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/fock_like_operators.irp.f
rename to src/MRPT_Utils/fock_like_operators.irp.f
diff --git a/plugins/MRPT_Utils/give_2h2p.irp.f b/src/MRPT_Utils/give_2h2p.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/give_2h2p.irp.f
rename to src/MRPT_Utils/give_2h2p.irp.f
diff --git a/plugins/MRPT_Utils/mrpt_dress.irp.f b/src/MRPT_Utils/mrpt_dress.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/mrpt_dress.irp.f
rename to src/MRPT_Utils/mrpt_dress.irp.f
diff --git a/plugins/MRPT_Utils/mrpt_utils.irp.f b/src/MRPT_Utils/mrpt_utils.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/mrpt_utils.irp.f
rename to src/MRPT_Utils/mrpt_utils.irp.f
diff --git a/plugins/MRPT_Utils/new_way.irp.f b/src/MRPT_Utils/new_way.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/new_way.irp.f
rename to src/MRPT_Utils/new_way.irp.f
diff --git a/plugins/MRPT_Utils/new_way_second_order_coef.irp.f b/src/MRPT_Utils/new_way_second_order_coef.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/new_way_second_order_coef.irp.f
rename to src/MRPT_Utils/new_way_second_order_coef.irp.f
diff --git a/plugins/MRPT_Utils/psi_active_prov.irp.f b/src/MRPT_Utils/psi_active_prov.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/psi_active_prov.irp.f
rename to src/MRPT_Utils/psi_active_prov.irp.f
diff --git a/plugins/MRPT_Utils/second_order_new.irp.f b/src/MRPT_Utils/second_order_new.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/second_order_new.irp.f
rename to src/MRPT_Utils/second_order_new.irp.f
diff --git a/plugins/MRPT_Utils/second_order_new_2p.irp.f b/src/MRPT_Utils/second_order_new_2p.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/second_order_new_2p.irp.f
rename to src/MRPT_Utils/second_order_new_2p.irp.f
diff --git a/plugins/MRPT_Utils/utils_bitmask.irp.f b/src/MRPT_Utils/utils_bitmask.irp.f
similarity index 100%
rename from plugins/MRPT_Utils/utils_bitmask.irp.f
rename to src/MRPT_Utils/utils_bitmask.irp.f