CNG vs. LPG Price Comparison: Which Should Use?

27/05/2026

1. How Are CNG and LPG Different?

Before comparing prices, it is important to understand the fundamental nature of each gas — because differences in physical properties directly affect transportation, storage, and operating costs.

2. Pure Fuel Price Comparison

The industrial CNG market in Vietnam is currently priced in mmBTU (million British Thermal Units) — an international unit that accurately reflects the actual heat energy delivered, independent of the physical weight or volume of the gas.

To make a fair comparison with LPG, both must be converted to the same unit of heat energy:

Gas Type	Reference Price	Heat Value Conversion	Cost per mmBTU
Industrial LPG	~29,000 VND/kg (~29M VND/ton)	1 ton LPG ≈ 43.6 mmBTU	~665,000 VND/mmBTU
Industrial CNG	~540,000 VND/mmBTU	—	~540,000 VND/mmBTU

Reference based on average prices from early 2026. See the latest gas price table here.

Note: Actual prices fluctuate with supply conditions, global oil prices, transport distance, contract volume, and other factors.

Preliminary conclusion: Based on equivalent heat energy, CNG is approximately 15–25% cheaper than LPG on pure fuel cost.

3. Infrastructure Investment — The Key Difference

This is the part many businesses overlook when comparing. CNG systems require equipment rated for very high pressure (200–250 bar), more complex engineering standards, and a greater number of investment items compared to LPG. Specifically:

Investment Item	LPG	CNG
Storage vessel	Standard horizontal low-pressure tank	Specialized high-pressure trailer/module (200–250 bar). Larger site area required for the full station.
Pressure reduction unit	Simpler equipment and valves	Complex PRU station, expensive components, high technical requirements
Safety & inspection certification	Standard fire safety certification	Fire safety + pressure vessel inspection — more complex
Operations	Fully automated	Requires on-site technical staff 24/7
Estimated total infrastructure	800M – 1.5B VND	2.5B – 5.5B VND

CNG infrastructure typically costs 2–3 times more than LPG for the same consumption level. This figure must be factored into the payback calculation before deciding to switch.

Worked Example 1 — Factory consuming 30 tons of LPG per month

(Medium-small scale — food processing, garment, light manufacturing)

Item	LPG	CNG
Consumption	30 tons/month	—
Heat value conversion	30 tons × 43.6 mmBTU/ton	= 1,308 mmBTU/month
Unit price	29,000,000 VND/ton	665,000 VND/mmBTU
Monthly fuel cost	870M VND	~869M VND
Infrastructure investment	~2B VND	~3.5B VND

Worked Example 2 — Factory consuming 150 tons of LPG per month

(Large scale — electronics, chemicals, high-capacity food processing)

Item	LPG	CNG
Consumption	150 tons/month	—
Heat value conversion	150 tons × 43.6 mmBTU/ton	= 6,540 mmBTU/month
Unit price	29,000,000 VND/ton	665,000 VND/mmBTU (large volume)
Monthly fuel cost	4.35B VND	~4.3B VND
Infrastructure investment	~4B VND	~5.5B VND

→ Conclusion: For large consumption volumes, CNG is clearly the more effective long-term option.

4. When Should You Choose CNG?

There is no universally superior option. The right decision depends on actual consumption volume, geographic location, and each business's long-term plans.

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