HAVANA - Raul Castro turned over Cuba's presidency Thursday to a 57-year-old successor he said would hold power until 2031, a plan that would place the state the Castro brothers founded and ruled for 60 years in the hands of a Communist Party official little known to most.

Castro's 90-minute valedictory speech offered his first clear vision for the nation's future power structure under new President Miguel Mario Diaz-Canel Bermudez. Castro said he foresees the white-haired electronics engineer serving two five-year terms as leader of the Cuban government, and taking the helm of the Communist Party, the country's ultimate authority, when Castro leaves the powerful position in 2021.

"From that point on, I will be just another soldier defending this revolution," Castro said. The 86-year-old general broke frequently from his prepared remarks to joke with officials on the dais in the National Assembly.

In his own half-hour speech to the nation, Diaz-Canel pledged to preserve Cuba's communist system while gradually reforming the economy and making the government more responsive.

"There's no space here for a transition that ignores or destroys the legacy of so many years of struggle," Diaz-Canel said. "For us, it's totally clear that only the Communist Party of Cuba, the guiding force of society and the state, guarantees the unity of the nation."

Diaz-Canel said he would work to implement a long-term plan laid out by the National Assembly and Communist Party that would continue allowing the limited growth of private enterprises like restaurants and taxis, while leaving the economy's most important sectors such as energy, mining, telecommunications, medical services and rum- and cigar-production in the hands of the state.

"The people have given this assembly the mandate to provide continuity to the Cuban Revolution during a crucial, historic moment that will be defined by all that we achieve in the advance of the modernization of our social and economic model," Diaz-Canel said.

Reuters