SAO PAULO, March 20 (Reuters) - Brazil secured 501.3

megawatts of electricity on Friday from thermal stations run

through diesel, fuel oil and biodiesel, the deal's results

showed.

* Among the winners, there were two diesel projects from

state-run oil firm Petrobras.

* The contracts have different periods, beginning as soon as

2026 and expiring as far as 2040.

* It was the second auction this week held by the government

to secure back-up power capacity for periods of high demand or

scarce supply.

* On Wednesday, the government held a larger similar auction

focused on hydro power stations, as well as gas and coal thermal

units.

* The government secured 19 gigawatts in the Wednesday

auction, representing the biggest ever power deal of its kind in

Brazil.