Garmin Pilot, which I fly with, does that for both obstacles and terrain, but not power lines. If you are exploiting your 1/2 mile vis./clear of clouds, U.S. class G privileges at an appropriate speed, terrain warnings have to be off because you are generally so low terrain warnings are continuous, and obstacles, i.e. radio towers, are rarely a surprise. Power lines, on the other hand, continue to be a near invisible and serious threat.
However, the modern Garmin GTN series panel navigators can be equipped with HTAWS that includes a substantial U.S. power line obstacle database. It's been available for years. I've not had the opportunity to fly with that technology, unfortunately, so can't speak to it personally.