$20$ points

What value most closely approximates a typical source$-$to$-$site energy conversation ratio for the national U$.$S$.$ electric grid? In other words, for every $1$ unit of useful electricity

delivered to a building as site energy, approximately how many units of primary $($i$.$e$.$ source$)$ energy are required to produce and deliver the electricity through the grid?

$2\mathrm{.}8$

$1\mathrm{.}0$

$0\mathrm{.}8$

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