Southern Energy starts 19,000-foot Williamsburg test well

Drilling begins at Williamsburg

Southern Energy Corp. has started drilling the Terrible Creek 21-2 #2 Cotton Valley test well at its Williamsburg Field.

The well was spudded, meaning drilling formally began, on 11 August 2026. It is the first of two farm-out commitment wells scheduled to be drilled this year under the company's agreement with a strategic partner.

This is a meaningful operational milestone, but it is important to keep expectations measured. Southern has started the test rather than announced a discovery, commercial flow rate or production increase.

Investors can read the original company announcement for the full technical and regulatory wording.

Key Williamsburg well figures

Item	Detail
Well	Terrible Creek 21-2 #2
Target formation	Cotton Valley
Field	Williamsburg
Spud date	11 August 2026
Planned total depth	Approximately 19,000 feet
Gross drilling and completion cost	US$3.9 million per well
Southern's working interest	50%
Southern's expected cost share	Roughly 50%
Commitment wells planned this year	Two

Based on the disclosed gross cost, Southern's share is expected to be roughly US$1.95 million per well. If the second commitment well carries the same economics, the combined share for both would be approximately US$3.9 million, although the eventual cost could differ from the estimate.

A working interest is the percentage ownership that determines a company's share of project costs and, if successful, production. Southern is funding about half of the drilling and completion expenditure in exchange for a 50% working interest.

Why the farm-out structure matters

The farm-out enables Southern to test the Cotton Valley opportunity without funding the entire well itself. That reduces its absolute capital exposure compared with retaining a 100% interest, while preserving a meaningful share of any successful outcome.

This balance matters for a smaller exploration and production company. Deep wells can be expensive and operationally complex, so sharing the cost with a partner can make the capital programme more manageable.

The trade-off is straightforward: Southern also shares any potential production and economic benefit. A farm-out limits both the downside exposure and the upside retained by the company.

The strategic partner's identity and the detailed economics beyond the disclosed cost share and working interest were not disclosed in this announcement.

Southern previously set out the Williamsburg joint venture alongside its first-quarter 2026 results. This latest update moves the project from agreement into physical execution.

What success could change

Southern is an established producer with natural gas and light oil assets in Mississippi. Management believes success at Williamsburg could increase the company's weighting towards oil and natural gas liquids.

That would potentially broaden the production mix beyond its existing natural gas base. However, the announcement does not provide an expected flow rate, production target, reserve estimate or forecast financial contribution from the well.

Chief executive Ian Atkinson pointed to recent competitor drilling success near Southern's acreage as a reason for optimism. That is encouraging context from management, but it does not guarantee that Terrible Creek 21-2 #2 will deliver a commercial result.

Geology can vary across relatively short distances. The well still needs to be drilled, completed and tested successfully before investors can judge its productive capacity or economics.

What happens next

Southern plans to drill the well to approximately 19,000 feet. Completion and testing will begin after the drilling rig has moved off site.

The company did not disclose a firm date for reaching total depth, starting completion work or publishing test results. Those stages now form the main near-term operational milestones.

Investors should watch for:

• confirmation that the well reaches its planned depth;
• any change to the estimated US$3.9 million gross cost;
• completion and testing results;
• initial production rates, if the test succeeds;
• details of the second commitment well; and
• evidence that the programme can increase Southern's oil and liquids weighting.

Until those details arrive, the investment case remains exposed to drilling, completion and geological risk. Delays, cost overruns or disappointing test results are all possible.

Market maker appointment is secondary

Southern has also appointed ICP Securities to provide automated market-making services using its proprietary algorithm.

ICP will receive C$7,500 per month plus applicable taxes. The initial term runs for four months from 10 August 2026, implying a base cost of C$30,000 before tax during that period. The agreement then renews monthly unless either side provides the required notice.

There are no performance-related payments, stock options or other compensation connected with the appointment. ICP is an arm's length party and will fund its own purchases and sales of Southern shares.

The stated purpose is to help correct temporary supply and demand imbalances, improve quote quality and support liquidity. In practical terms, market makers seek to make trading smoother by continuously providing prices at which shares can be bought or sold.

This may help trading conditions, particularly where volumes are limited, but it does not alter the value of Southern's assets or guarantee a higher share price. The appointment should therefore be treated as a supporting measure rather than the main investment news.

Williamsburg now becomes the key operational test

The important development is that Southern has moved from planning to drilling at Williamsburg while sharing the cost with a strategic partner.

The 50% structure provides meaningful exposure to the Cotton Valley target without requiring Southern to carry the full US$3.9 million estimated cost of each well. A successful result could also begin shifting the company's production mix towards oil and liquids.

For now, though, this remains a drilling catalyst rather than a proven production gain. The next updates on depth, completion, testing and costs will determine whether the Williamsburg programme starts to create tangible operational value.