A group of U.S. investors is in talks with the Bulgarian government to acquire a minority stake in the Chiren underground gas storage facility, the country’s only such site and a key regional hub for balancing and reverse flows across southeastern Europe, Reuters reported exclusively on Monday. The group reportedly includes financier Stephen P. Lynch, infrastructure specialist Fei Wang, and former Trump campaign official Brad Parscale. Bulgarian state energy officials confirmed the exploratory discussions, though no transaction terms have…