SAN FRANCISCO (MarketWatch) -- Natural gas prices held to losses Thursday after the Energy Information Administration reported a supply increase in line with expectations. Natural gas for October delivery traded at $3.76 per million British thermal units, down a penny. The EIA report showed natural gas in storage increased 54 billion cubic feet for the week ended Aug. 27. Analysts surveyed by Platts had expected an increase between 53 to 57 billion cubic feet.