"the two chandeliers that hang over the table still ran on gas"

 Electric lighting was introduced as carbon arc lighting for industrial use in 1801, and by the Victorian era had developed into electric filament lighting for industrial use.

By 1930 the newly formed Central Electricity Board had introduced an assisted wiring scheme to enable those in less wealthy homes to take advantage of the new power supply and to convert their gas lighting.

Gas Chandelier Converted to Electricity
Creative Commons AttributionGas Chandelier Converted to Electricity - Credit: Yearingermany