There are 'peaks and valleys' [=high and low periods] in electricity usage throughout the year.
He said I talk like a 'Valley girl'. And I said, “Like, whatever!”
the Shenandoah (River) 'Valley'
(..) You are. You just don't know it yet. Do you think people deserve a second chance? Yeah, I do. BARNES: This is it. Skynet's valley of death. We never been this deep before. JOHN: We gotta be sure the signal works in their territory... ...on the bigger machines. JOHN: (..)2009 Terminator Salvation
(..) MARCUS: No, I'm guilty. Just cut me up until there's nothing left. PRIEST: Yea, though I walk through the valley of the shadow of death... ...I will fear no evil, for thou art with me. Thy rod and thy staff, they comfort me. WARDEN: (..)2009 Terminator Salvation