Código PHP:
$objeto = PHPExcel_IOFactory::createReader('Excel2007');
$this->excel = $objeto->load('../plantillas/plantilla.xlsx');//plantilla
$this->excel->setActiveSheetIndexByName('TOTALES');//hoja de excel
$result = $this->departamento->ConsultarDepartamentos();//Consulta
$this->excel->getActiveSheet()->setCellValue('A8',$result[0]['DESCRIPCION_CORTA']);//Info de celdas
$this->excel->getActiveSheet()->setCellValue('A10',$result[1]['DESCRIPCION_CORTA']);
$this->excel->getActiveSheet()->setCellValue('A12',$result[2]['DESCRIPCION_CORTA']);
$this->excel->getActiveSheet()->setCellValue('A14',$result[3]['DESCRIPCION_CORTA']);
$this->excel->getActiveSheet()->setCellValue('A16',$result[4]['DESCRIPCION_CORTA']);
$objetoWrite = PHPExcel_IOFactory::createWriter($this->excel,'Excel2007');
$objetoWrite->save(reportes/'.$nombre.'.xlsx);//Guarda documento generado
https://www.dropbox.com/s/f7gvyej4b9...plantilla.xlsx