In Hades Bloom notes that the carriage is nearing a "Gasworks"  plant, and many later chapters glance at its product. Cities in Britain, America, and Europe had been building these coal gasification facilities for nearly a hundred years, and they remained important well into the 20th century, until electricity and "natural" gas from drilled wells put them out of business. More than 3,000 Dublin streetlights were fueled by coal gas, and most middle-class homes had at least one room lit by it.

John Hunt 2023

Detail of 1900 Bartholomew's map with added arrows showing locations of gasworks along Ringsend Road and Great Brunswick Street.
Source: Pierce, James Joyce's Ireland.

1985 photograph of two cylindrical gasometers on a site next to Sir John Rogerson's Quay, built later than the facility mentioned in Ulysses.
Source: Wikimedia Commons.

The Alliance Building on South Lotts Street, originally an 1885 gasometer.

Photograph of a Dublin Corporation lamplighter, date unknown.