Only into its third day of sale, Apple recognized the "Korean Power Grid Info" app and put it right on top of the Business category of the Korean App Store, listing it under "New & Noteworthy" section. It's doing okay on the popularity as well (peaked at #15 on the free apps in the category, and doing #16 as of this writing), so I hope a lot more people will notice and download the app for some time to come.
Meanwhile, the app is chugging along slightly below top 100 in the Business category in the US App Store. I'm guessing a few Koreans are downloading from there, which in turn keeps the rank up. An app review and listing site called PodGate is listing the app as one of the top 100 most popular. Rank floats around #92 to #98 so far.