Why Warren Buffett made his latest blockbuster deal — a bet on electric vehicles?

Warren Buffett.
Gerald Miller | CNBC

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Warren Buffett is finally putting a chunk of Berkshire Hathaway's record cash pile to work during the market turmoil with its purchase of Dominion Energy's natural gas transmission and storage assets.

Berkshire is spending $4 billion for the deal along with the assumption of $5.7 billion in debt, marking the conglomerate's first transaction since the coronavirus crisis and its biggest purchase in years. 

One energy investor had an interesting theory behind the Oracle of Omaha's long-awaited move, announced Sunday.