Electricity purchase and sale contracts containing an arbitration clause between energy generators and a mixed-capital company (Copel Distribuição S/A). Citizen's action seeking the annulment of the contracts on the grounds of alleged misappropriation of public funds. Notwithstanding the fact that the kompetenz-kompetenz principle has been adopted in Brazilian law, there is a possibility that the mixed-capital company may appear as plaintiff in the citizen's action because the latter does not seek to challenge the validity of the arbitration clause or to annul the arbitration awards already rendered. Dismissal of the citizen's action on account of the failure to demonstrate irregularities in the contracts and because said contracts had already been terminated by arbitral decisions: