Fitch Ratings has given an AAA(twn) national long-term rating on Taiwan Power's NT$11.91 billion senior unsecured bonds, according to a Wednesday release.

The proposed bonds' rating is in line with the power company's national long-term rating, as they serve as the issuer's obligations.

The rating is also the same as Taiwan's issuer default rating, stemming from an extremely strong government support potential, Fitch said.

The company has a leading role in Taiwan's energy security and has a large market share, according to the rating agency.

Changes in Taiwan's rating or the level of government support could lead to future rating actions, Fitch said.