Recently, there is another big news in the new energy industry: Buffett is investing more in the upstream key material of the new energy vehicle industry chain - lithium. On Tuesday Eastern Time, Western Oil Company, in which Buffett holds a significant stake, announced the establishment of a joint venture with Berkshire Hathaway Energy (BHE), a subsidiary of Buffett, to jointly test and deploy technology for extracting lithium from geothermal brine.