The best replacement for mitochondria is chloroplast.

The best alternatives to mitochondria are rated as following:

★★★★★	chloroplast
★★★★★	mitochondrion
★★	chloroplasts
★★	nucleus
★★	ribosomes
★	chloroplast first
★	cytoplasm
★	mitochondria
★	peroxisome
★	chloroplast bigger
★	plastids
	chloroplast came first
	cytosol
	chloroplasts differences
	chloroplast similarities
	nucleus bigger
	chloroplast electron transport
	glycolysis

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Speaking about mitochondria, one probably shouldn't forget about many cristae will be found in which cells.

Other search terms related to mitochondria and their ratings are:

★★★★★	many cristae will be found in which cells
★★★★★	other organelles
★★★★	cellular respiration
★★★	respiration
★	atp
	cell

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Google Trends

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mitochondria

chloroplast

mitochondrion