Crowley microgrid reflects LNG’s expanding role

Pittsburgh International Airport is one such example. The airport has deployed a microgrid that combines five natural gas generators with a 3 MW solar array. Gas is sourced from on-site wells and the system provides 100% of the airport’s electrical demand. In this case, the microgrid is not only an energy resilience asset, but also a commercial decision, as it shields the facility from market energy price volatility.

Elsewhere, the Bahamas has become a proving ground for LNG-influenced microgrid innovation. Bahamas Power and Light (BPL) announced that it intends to implement microgrids in the islands of Abaco and Eleuthera. These areas have been hit hard by hurricanes in recent years, prompting a reassessment of energy supply strategies. While precise technical details have yet to be disclosed, BPL has confirmed that natural gas – including LNG imports – will be part of the energy mix. The goal is to deliver more reliable, decentralised power systems with lower operational emissions.

The island setting is ideal for microgrids. Given the high cost of diesel imports and the vulnerability of transmission networks to storm damage, modular LNG-fuelled generation offers a compelling alternative. Encorp, a distributed energy provider, has been assisting with several projects in the Bahamas that aim to use microgrids to serve communities and critical infrastructure where diesel generators were previously the default.

In Southeast Asia, there are signs that the model is also being applied to more technologically demanding environments. ST Telemedia Global Data Centres (STT GDC) has announced plans for a microgrid-supporting facility in Bangkok, Thailand. The system will draw on regasified LNG for district cooling, converting the cold energy released during the regasification process into a cooling medium for servers. The Bangkok 3 data centre, scheduled to be operational by the end of 2023, is part of a collaboration between STT GDC and PTT Digital Solutions, a subsidiary of Thailand’s national energy company.

The approach is different from Crowley’s but equally rooted in LNG’s physical properties. Instead of relying on combustion, the Bangkok project exploits LNG’s cryogenic potential to reduce power consumption by limiting the load on traditional electrical chillers. It is a concept gaining traction in the data centre industry, which is under growing pressure to improve energy efficiency.

“LNG-fuelled engines are generally quieter and more fuel-efficient than equivalent diesel units”

The case for LNG in microgrids is often framed around the fuel’s lower emissions profile relative to diesel. While methane slip and lifecycle emissions remain valid concerns, in controlled environments LNG offers reduced particulate matter and nitrogen oxide emissions, alongside the possibility of integrating renewable gas blends in future.

Moreover, LNG-fuelled engines are generally quieter and more fuel-efficient than equivalent diesel units in steady-state operations, especially when linked with smart controls and battery buffering. For coastal or remote locations without pipeline access, LNG can be delivered by small-scale carriers or ISO tank containers, giving it a logistical advantage in geographies where grid extension or diesel resupply is problematic.

Nonetheless, challenges remain. Capital expenditure for LNG infrastructure – including storage tanks, regasification units, and safety systems – is high, and may only be justifiable when security of supply or emissions regulations necessitate a longer-term solution. Operational complexity also increases, particularly when hybridised with solar and battery systems, as synchronisation, control logic, and safety procedures must be meticulously engineered.

Still, the trend is clear. As Crowley’s Puerto Rico project demonstrates, companies are increasingly looking to LNG microgrids not just as emergency backups, but as core infrastructure for daily operations. The ability to combine LNG with solar and battery storage provides operational flexibility that traditional grid connections often cannot match.

While LNG is unlikely to be the final answer to decentralised clean energy, it is proving to be a useful transitional component. It enables microgrids to scale beyond what battery and solar alone can provide, particularly for industrial and critical infrastructure. It also opens the door to future adoption of bio-LNG or synthetic methane, should supply chains mature.

For now, LNG-fuelled microgrids occupy a pragmatic space between ambition and feasibility. Crowley’s system in San Juan is one of the clearest illustrations of what this approach can offer: grid independence, reliability in adverse conditions, and lower emissions in day-to-day operations. Others are following with adaptations tailored to their environments, whether that be oilfields, airports, islands, or urban data centres.

As more stakeholders examine the interplay between energy resilience, decarbonisation, and cost, LNG-powered microgrids will likely become a fixture in energy planning discussions. Not as a final solution, but as a functional response to the evolving demands of reliable, lower-carbon power.