EDN is trading at 2.45% up now at $25.07 after a volatile two-day pullback and rebound. The clearest recent catalyst is the June 29 S&P Global Ratings upgrade to raAA- from raA+, which helped trigger a prior rally before profit-taking set in on July 1.
No new company-specific announcement is evident in the available news, so the move appears to be a continuation of post-upgrade trading rather than a fresh event.