OpenAI is in advanced talks to buy electricity from Sam Altman-backed fusion startup Helion Energy, according to a person familiar with the situation.Why it matters: The move shows OpenAI is serious about tapping fusion energy to help meet massive power demands.Driving the news: OpenAI could secure a guaranteed portion of Helion's production, initially 12.5%, per the source.The talks center on OpenAI receiving the equivalent of 5 gigawatts by 2030, scaling to 50 gigawatts by 2035.Between the lin...