Three Hydrogen Stocks with Large Revenue Profiles

Estimated reading time: 5 minutes · Last updated: 3 October 2026

Three hydrogen fuel-cell-related stocks to watch are Siemens Energy, Cummins and FuelCell Energy; together they show how established industrial groups and specialist developers give investors exposure to the hydrogen transition. Siemens Energy’s segment reporting indicates about €13.4 billion attributable to Gas Services alongside a broader set of businesses that provide scale; Cummins reports roughly US$12.9 billion from Distribution and related power divisions; FuelCell Energy records about US$154 million from fuel-cell plant production. The revenue breakdowns and company program details are taken from each firm’s public segment reports.

Why these hydrogen fuel cell stocks matter now

Rising government borrowing costs and pressure in fixed income markets are shifting where capital looks for growth; one outcome is more interest in cleaner power technologies such as hydrogen fuel cells. That dynamic matters because it changes the investor audience: larger industrial groups can convert corporate-scale order books into early hydrogen deployments, while small specialists offer direct exposure to on-site fuel cell deployments.

The three companies profiled illustrate that split. Siemens Energy combines turbines, grid equipment and large electrolyzer capacity inside a very large platform. Cummins pairs engines and power systems with fuel cell and fuel-delivery programs that plug into trucks, backup power and industrial uses. FuelCell Energy is a specialist whose carbonate and tri‑gen systems put electricity and zero‑carbon hydrogen on customer sites.

Company snapshots and where the hydrogen exposure sits

Siemens Energy gives investors scale exposure to hydrogen through its industrial franchises. The company’s segment figures include about €13.4b from Gas Services, about €12.9b from Grid Technologies, about €10.4b from Siemens Gamesa and about €5.9b from Transformation of Industry, and its market cap is €122b. That mix means hydrogen-related electrolyzer and grid work sits alongside large legacy businesses, which can stabilise cash flow but also mask project-level execution risk.

Cummins is an engine and power-systems group that reported roughly US$12.9 billion from Distribution, US$11.0 billion from Engine, US$10.2 billion from Components, US$8.1 billion from Power Systems and US$0.5 billion from Accelera, and it has a market capitalization of about US$71.8 billion. Its Power Systems and Accelera units are the clearest channels for deploying fuel cells into trucks, microgrids and industrial backup. Company filings also note an agreement for Cummins to supply about 2 GW of generator sets to Circe Energy for the 2026 to 2030 period.

FuelCell Energy is much smaller by revenue and market value: about $154 million from fuel cell plant production and research, and a market cap of $1.3 billion. Its carbonate and tri‑gen platforms are sited at customer locations to deliver electricity and hydrogen where heavy users need them, so its growth story depends on converting orders into operating plants and service contracts.

Execution risks and the margin swing factors investors should watch

Across the three names the common exposure is execution: large backlogs and new project bookings create the appearance of revenue visibility, but they come with supply‑chain, capacity and working‑capital demands that can compress free cash flow if projects slip. For Siemens Energy those demands are embedded in delivering large electrolyzer and grid contracts while managing wind and gas franchises at scale.

Cummins faces the operational test of scaling fuel cell and electrified platforms inside its existing manufacturing and distribution footprint; the company’s role supplying generator sets tied to data‑center microgrids in West Texas was described in the company coverage and spans deliveries through 2030. For FuelCell Energy the critical variable is ramping the Torrington facility from the current 31 megawatts toward a 100 megawatt target and turning that capacity into repeatable, margin‑positive sales and long‑term service agreements.

Case for and against near‑term hydrogen upside

The bottom line

Investors seeking hydrogen exposure can choose incumbents with scale or smaller specialists with direct product exposure. Siemens Energy and Cummins each tuck hydrogen capabilities into large, diversified franchises that can smooth cash flow but also make hydrogen returns sensitive to large project execution. FuelCell Energy offers direct, site‑level exposure but depends on converting orders into steady utilisation and service revenue. The investment case for each name therefore hinges less on the concept of hydrogen and more on whether order books turn into margin‑positive, repeatable operations.

What to watch

• Watch whether Siemens Energy converts its high backlog into delivered electrolyzer and grid projects; no date has been set for a companywide execution milestone.
• Track Cummins’ scheduled deliveries to Circe Energy through 2030 under the supply agreement described in the coverage.
• Watch progress at FuelCell Energy’s Torrington facility as management seeks to increase utilisation from 31 megawatts toward a 100 megawatt target; no firm target date was provided.

This article is information, not financial advice. Anyone acting on it should do their own checks.