0 . 6 5   kg ▁Ca O ▁= ▁ 6 . 1 1   ×   1 0 8   kg ▁c ement / year ▁ ▁Net ▁electric ity ▁generation ▁in ▁US : ▁ ▁( 4 1 5 ▁+ ▁ 3 1 8 ▁+ ▁ 5 1 ) ▁G W ▁= ▁ 7 8 4 ▁G W ▁= ▁ 7 . 8 4   ×   1 0 1 1 ▁W ▁ ▁Number ▁of ▁ 5 0 0 ▁M W ▁power ▁plants : ▁ 7 . 8 4   ×   1 0 1 1 ▁W ▁/ ▁ 5 . 0 0   ×   1 0 8 ▁W ▁= ▁ 1 5 6 8 ▁power ▁plants ▁ ▁Am ount ▁of ▁c ement ▁that ▁can ▁be ▁produced ▁from ▁Ca - loop ing ▁waste : ▁ 1 5 6 8   ×   6 . 1 1   ×   1 0 8   kg ▁c ement / ▁year ▁= ▁ 9 . 5 8   ×   1 0 1 1   kg ▁c ement / year ▁ ▁Production ▁from ▁Ca - loop ing ▁waste ▁as ▁percent ▁of ▁total ▁annual ▁c ement ▁consumption ▁= ▁[( 9 . 5 8   ×   1 0 1 1   kg )/ ▁( 1 . 1 0 4 7 0   ×   1 0 1 1   kg )]   ×   1 0 0 ▁= ▁ 8 7 0 % ▁ ▁Therefore , ▁amount ▁of ▁c ement ▁production ▁from ▁Ca - loop ing