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Jing Zhang, communications officer for the Gates Foundation’s Beijing office, said after the meeting that the office wasn’t answering questions about the event but a press conference was scheduled for Thursday.

Mr. Buffett is also in China to attend a series of events by BYD Co. to highlight the company’s clean energy strategy. Mr. Buffett’s Berkshire Hathaway Inc. owns a 10 percent stake in BYD.

At an event Wednesday in Beijing, BYD announced it would donate 1,000 sets of electricity storage systems for houses in remote areas of Tibet.

“We take for granted having electricity. Many families haven’t had electricity. It can change the world,” Mr. Buffett said.