Vistra (VST) reported Q1 net loss Wednesday of $268 million, swinging from a net income of $18 million a year earlier.

Operating revenue for the quarter ended March 31 was $3.93 billion, compared with $3.05 billion a year earlier.

Two analysts surveyed by FactSet expected $4.55 billion.

Shares of Vistra were down 1.2% in recent premarket activity Wednesday.