The Hilbig Gas Storage Facility is an underground reservoir in Rockne that helps ensure a reliable natural gas supply and greater fuel price stability for LCRA's gas-fired power plants.

Hilbig, originally an ancient volcano that was sealed later by an outer layer of shale, has a working storage capacity of up to 4 billion cubic feet of natural gas.

Throughout its history, the dome-shaped reservoir has been filled with water, oil and gas. The site in Bastrop County is a mature oil field, which was first put into commercial operation in the 1930s. LCRA purchased the field in 1990 to store natural gas.

The Hilbig field helps LCRA lower average gas costs by storing gas purchased at favorable prices while also providing increased reliability and replacing higher cost fuel oil during gas shortages.

To ensure safety, LCRA constantly monitors the pressure of the gas contained in Hilbig and keeps gas stored in the reservoir at safe levels. In the unlikely event of a gas leak, safety valves located strategically throughout the facility would automatically close to prevent accidents.