Key highlights

  • Horizon Oil Ltd (ASX:HZN) shares closed at $0.205, up 5.13%, on 19 October 2026.
  • A 9 September 2026 announcement says the Nam Phong booster gas compressor entered service on 4 September 2026.
  • Total field sales are about 10.3 TJ/d gross, up 84% on average sales before start-up.

Horizon Oil Ltd (ASX:HZN) is an Australian-listed oil and gas company with interests in Thailand, Papua New Guinea and other regions. On 19 October 2026, the shares closed at $0.205, up 5.13%. In an ASX announcement dated 9 September 2026, the company reported that the Nam Phong Booster Gas Compressor (BGC) project in Thailand had been commissioned and started up.

The compressor project

The BGC entered service on 4 September 2026. It was designed to cut system backpressure, improve well deliverability and raise gas recovery from the mature Nam Phong field, using a leased gas engine-driven booster compressor. The project was sanctioned in January 2026, following Horizon’s Acquisition of the Nam Phong asset in August 2025. The company says the compressor was delivered safely, on time and below budget.

Initial operating results show total field sales of about 10.3 TJ/d on a gross basis, an increase of 84% compared with average sales before start-up. Horizon holds an effective 60% interest in the field, and it says the higher rates take Thailand’s contribution to group production from about 2,000 barrels of oil equivalent per day to about 2,500.

Contract and ownership structure

Gas from Nam Phong is sold under a long-term oil-linked gas sales contract, so the announcement says higher volumes are expected to lift Revenue and Cash Flow for the joint venture given recent oil prices. The Block E5 participants are MH Energy Thailand, the operator, at 80%, and PTTEP at 20%. MH Energy Thailand is 75% owned by Horizon and 25% by Matahio Energy, which manages operations on its behalf. The company thanked PTTEP and Thailand’s Department of Mineral Fuels for their support through approval, construction and commissioning.

A booster compressor lowers the pressure on the production side of a gas system, which lets wells flow more freely as reservoir pressure declines. The announcement describes the project as designed to reduce system backpressure, improve well deliverability and raise recovery from a mature field, and notes it uses a leased, gas engine-driven unit. It was sanctioned in January 2026, about five months after the Nam Phong acquisition completed in August 2025, and entered service on 4 September 2026.

The announcement does not give the cost of the compressor, the Lease terms, the Volume of additional reserves expected or the contract gas price. It states that the higher rate lifts Thailand’s contribution to group production by about 500 barrels of oil equivalent per day, from about 2,000 to about 2,500, on Horizon’s effective 60% interest. Shareholders wanting those details would need to look to later quarterly reports.

Sector backdrop

The benchmark index finished the session higher. The S&P/ASX 200 (ASX: XJO) stood at 8,845.70 at 4:25 pm (GMT+11) on 19 October 2026, up 0.44%, or 39.00 points, for the day. On the sector map, Energy rose 2.16%, the largest gain among the labelled segments. More broadly, Energy rose 2.16%, Industrials 0.93%, Financials 0.85%, Utilities 0.38% and Consumer Staples 0.25%, while Information Technology fell 1.35%, A-REIT 0.34%, Consumer Discretionary 0.18%, Telecommunication Services 0.16% and Health Care 0.13%.

Risks shareholders should weigh

The 84% increase is based on initial operating results, so performance over a longer period is not yet known. Nam Phong is described as a mature field, and the benefit of the compressor depends on reservoir response and equipment reliability. The compressor is leased, so there are ongoing lease costs that the announcement does not quantify.

Revenue is linked to oil prices through the sales contract, which means a fall in oil prices would reduce the benefit as well as a rise increasing it. The announcement states the company’s effective interest is 60%, so a share of the revenue flows to joint venture partners. Further detail on cash flow impact has not been provided.

What’s next

The announcement does not outline further steps beyond the start-up. Shareholders may look to subsequent ASX releases and quarterly reports for sustained production rates from Nam Phong and its effect on group production.