Considering that night-time energy from nuclear plants, as well as peak 12pm noon energy from Solar Power plants, are going wasted right now, 18% round-trip eff

Considering that night-time energy from nuclear plants, as well as peak 12pm noon energy from Solar Power plants, are going wasted right now, 18% round-trip efficiency is better than the 0%-efficient fully wasted energy that we're doing right now.