Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 08, 2019
OmniMetrix acquistion [Member]
Entity Registrant Name	ACORN ENERGY, INC.
Entity Central Index Key	0000880984
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business Flag	true
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		29,555,786
Trading Symbol	ACFN
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019