RIO DE JANEIRO--(BUSINESS WIRE)--Fitch Ratings has affirmed Transmissora Alianca de Energia Eletrica S.A.'s (Taesa) foreign and local currency Issuer Default Ratings (IDRs) at 'BBB' and long-term national scale rating at 'AAA(bra)'. Fitch has also affirmed at 'AAA(bra)' the national scale rating for Taesa's BRL2,160 million third senior unsecured debenture issuance. The Rating Outlook is Stable. A full list of ratings follows at the end of this release. KEY RATING DRIVERS Taesa's investment gra