In October of 2023, American Electric Power (AEP 1.36%), also known as AEP, increased its quarterly dividend by $0.05 a share, taking it from $0.83 to $0.88. That's a roughly 6% hike. What's important about that dividend move is that it lives up to a key management promise to dividend investors.Here's what you need to know.AEP is an attractive yield storyAlthough a 4.1% dividend yield may not stack up against a virtual no-risk certificate of deposit (CD) offering as much as 5%, that doesn't mean investors s ...