This excerpt taken from the PBR 20-F filed Jun 30, 2005.
PETROBRAS ANNUAL BUNKER FUEL PRODUCTION
Fuel oil originates from residual fractions or distillation units at the refinery and from other processes such as deasphalting. Diluents in the form of lighter cutter stocks are mixed into the residue pool to create the desired viscosity for different types of fuel oil.
Major buyers of Petrobras fuel oil include utilities, refineries and traders. Fuel oil is used by industries and utilities to run machinery and generate electricity. Commercial buildings and homes employ fuel oil for heating purposes, and refineries use fuel oil for blending purposes.
Fuel Oil Export Sales
The following table sets forth Petrobras fuel oil export sales for the period from 2000 to 2004: