Dispute concerning an electricity purchase and sale contract containing a forum selection clause. Impossibility of applying arbitration clauses set forth in ANEEL regulations, which merely allow for the use of arbitration, or in contracts to which the parties to the lawsuit are not signatories. Dispute involving only the contracting parties, and not ANEEL. Continuation of the action before the judiciary, including because the parties expressly chose the "forum" of Brasília to resolve disputes arising from the contract: