Between Hubris, Hype, and Hardship: A.H.T. Syngas, 2G Energy, and SFC Energy in the Cleantech Battle

CLEAN ENERGY: BETWEEN A NEW ERA AND A LACK OF ATTENTION

For years, the German small-cap segment has lagged behind the DAX. Companies that, in theory, should actually be on the winning side are having a particularly hard time: providers of CO₂-free energy. But since the end of the brief hydrogen hype at the start of the decade and the subsequent outbreak of war in Ukraine, the once-maligned defense stocks have overtaken future technologies. A situation that has been further exacerbated by Donald Trump's re-election as US president. Instead of promoting climate protection, the most powerful man in the world is banking on old industries fueled by coal, gas, and oil. In doing so, he is undermining global efforts to reduce greenhouse gases. Although EU policy remains focused on CO₂ reduction, second- and third-tier cleantech companies are fighting a losing battle. The labels "German small-cap" and "sustainability" have become a double liability. The managers of the affected companies are desperately struggling to attract investors' attention.

Gero Ferges knows this all too well. The CEO of A.H.T. Syngas Technology has an exciting story to tell, yet he finds little traction in the hallowed halls of high finance. A.H.T. Syngas stock, occasionally listed as AHT Syngas, is found at best in the portfolios of asset managers specializing in sustainability, such as Murphy & Spitz, who themselves struggle to attract attention. The result has been a years-long decline in share prices. Murphy & Spitz Green Capital plummeted from EUR 4.40 to 1.30 within five years, while A.H.T. Syngas fell from over EUR 20.00 to just over EUR 3.00 in an even shorter period. The market capitalization of both companies is less than EUR 10 million, placing them well below the radar of established institutional investors. In the case of A.H.T. Syngas, there is the additional factor that while its operational business is based in Bonn and Overath, the official company headquarters is located in Eindhoven, Netherlands—at least for now, as the move is scheduled to take place this year. Whether this will increase interest among stock market investors remains to be seen, however.

TURNING WASTE INTO HYDROGEN: THE BUSINESS MODEL OF A.H.T. SYNGAS

At least the website of BNP Paribas Wealth Management features a brief company profile of A.H.T. Syngas, suggesting that the major French bank is not completely ignoring this small-cap stock. However, the BNP description is not particularly up-to-date. According to the description, the company is primarily active in the industrial services sector and is classified under the oil & gas industry. While "gas" is correct, the business model has nothing to do with oil multinationals like Shell or BP. The core business is, or rather was, the design, construction, and sale of plants that convert biomass, wood and fermentation residues, or sewage sludge into gas. In other words, the company makes its money by turning waste into electricity and heat. Unlike conventional biogas plants, the end result of the process is not a mixture of methane and carbon dioxide, but a clean hydrogen-based mix. This is called synthesis gas (hence the company name) and can be used either directly for heat generation or in a combined heat and power plant for decentralized energy production.

A.H.T.'s so-called double-fire or Twin-Fire process is patent-protected, as is the further development for the production of green hydrogen. The recently completed, publicly funded BiDroGen research project certifies that the A.H.T. process has scalable production costs between EUR 4.40 and EUR 7.98/kg of hydrogen, which is cheaper than producing electrolysis-based hydrogen. The company expects additional revenue from the sale of CO₂ credits. The equally interesting second part of the business model is contracting, which A.H.T. is now entering. This means that the plants are no longer just sold but are now operated by A.H.T. Syngas itself. To this end, the company enters into long-term energy supply contracts, for example with medium-sized firms, which ensures recurring revenue and ultimately justifies the "industrial services" classification.

WHAT ANALYSTS EXPECT FOR THE FUTURE

The only analysts who have so far taken a closer look at this largely undiscovered stock are Cosmin Filker and Matthias Greiffenberger from the Augsburg-based investment firm GBC Research. They expect revenue of just over EUR 9 million for 2026, which is projected to double to more than EUR 18 million next year. These estimates, which date from December 2025, do not yet include a recently announced partnership with the Polish project developer Innotec Energy, which is expected to generate orders worth around EUR 10 million as early as this year. Poland is a particularly interesting market, as the country remains heavily dependent on fossil fuels while also possessing vast domestic biomass resources. But whether with or without new business in Poland, according to GBC experts, the break-even point is expected to be sustainably exceeded in 2027 with earnings per share of EUR 0.38. Based on this estimate, the price-to-earnings (P/E) ratio stands at a favorable 8.0.

2G ENERGY: THE SMALL-CAP CLASSIC FROM THE MÜNSTERLAND

Completely different valuations are common when a company reaches the critical size relevant for institutional investors, which for many small-cap funds is a market capitalization of EUR 100 million. 2G Energy, for example, is trading at a P/E ratio of 19; its market capitalization of just over EUR 700 million is well above the estimated revenue of EUR 472.7 million for this year. However, the company is also much further along in its development, as evidenced by its corporate campus in Heek, Münsterland, which is hard to miss from the A31 highway. Construction work on the new administrative building and an additional 880-square-meter production hall for heat pumps is nearing completion. With over 1,000 employees and 15 subsidiaries, the combined heat and power (CHP) specialist operates in more than 50 countries and has a solid customer base that includes industrial companies, hotels, and even municipal utilities. The company has recently recorded strong growth, particularly abroad, and surprisingly, despite Trump, also in the US. A significant and growing portion of the business consists of long-term service and maintenance contracts for installed systems, with a focus on decentralized energy supply. Electricity, heat, and, where applicable, cooling are efficiently generated at the point of consumption. The systems are flexible and can be operated with natural gas, biogas, or 100% hydrogen.

In the 19 years since its IPO, the stock, now listed on the SDAX, has become a true small-cap classic, as the chart also shows. Most recently, the share price jumped to a new all-time high above the EUR 40.00 mark. 2G started in the summer of 2007 at a similarly low price level to that of A.H.T. Syngas today (albeit adjusted for a 4-for-1 stock split in 2022). The success story of 2G Energy is inextricably linked to the name Christian Grotholt, who founded the company in 1995 together with Ludger Gausling and led it for over 30 years. In the summer of 2025, he stepped down to the supervisory board. His successor, Pablo Hofelich, is aiming for annual revenue growth of 10%.

The newly established Data Center Solutions division, which offers fail-safe, efficient, and sustainable power supply for data centers, is expected to contribute to this. Hydrogen also remains a major focus for the executive, who has declared decarbonization, that is, the avoidance of greenhouse gas emissions, to be one of the central themes of his professional career.

SFC ENERGY: BETWEEN THE DEFENSE BOOM AND EARNINGS PRESSURE

In this regard, he is on the same page as Peter Podesser, the CEO of SFC Energy. The Austrian-born executive has been steering the business of the Brunnthal, near Munich-based company—which produces fuel cells for environmentally friendly, decentralized energy supply (SFC stands for "Smart Fuel Cells")—for two decades. Unlike with 2G Energy and A.H.T., the energy is not generated in large plants but virtually directly at the device. Whether at monitoring stations or in recreational vehicles, SFC primarily targets customers in areas where no power grid is available or where high reliability is required. In the meantime, Podesser has even garnered the desired attention from the investment community. With the outbreak of war in Ukraine and increased military budgets worldwide, the defense and security sector in particular has come into focus. Here, fuel cells are used to power soldiers in the field or to monitor critical infrastructure. Through investments, such as in the AI security provider Oneberry Technologies, SFC is increasingly combining its energy sources with digital surveillance technology and artificial intelligence.

These are ideal conditions for growth, yet this has not yet been reflected in the figures. Revenue fell by 1.0% year-over-year in 2025 to EUR 143.3 million, while adjusted earnings before interest and taxes (EBIT) plummeted by 42.6% to EUR 8.9 million. All in all, SFC even slipped into the red with earnings per share of EUR -0.03. In addition to extraordinary expenses and personnel costs, rising raw material prices were among the factors responsible for this. In its financial report, the company explicitly mentions the prices of platinum and ruthenium, which it says led to a significant increase in the cost of materials ratio. Although the Executive Board expects revenue to rise again to between EUR 150 and 160 million as early as this year, the stock's rally is over for now. Since reaching a 52-week high of over EUR 26.00 in the spring of 2025, the share price has nearly halved. SFC thus shares the fate of A.H.T. Syngas: without new positive news, it is likely to be difficult to regain momentum in the share price. The first-quarter figures, expected on May 15, could help—provided they turn out well.

MOMENTUM, VALUATION, AND A MATTER OF CAUTION

SFC's valuation, with an estimated P/E ratio of 19 for 2027, is exactly on par with 2G Energy's, yet its operational performance has recently been weak. Its market capitalization of nearly EUR 250 million is also significantly above expected annual revenue. What remains is the hope that the company will quickly return to a growth trajectory. For momentum investors, 2G Energy is therefore currently the top choice. A.H.T. Syngas is the cheapest of the three cleantech stocks based on a price-to-sales ratio of 1.0, though the company will not reach profitability until next year at the earliest. To reach the scale of the two established players in the decentralized energy supply market, the microcap needs one thing above all else: attention. That means a lot of work for CEO Ferges and his 27-member team.