What if we could capture the immense power of the sun, magnify its intensity up to 1,500°C , and reliably store that energy?
It could change how some of the world’s largest and most carbon-intensive industries work, from cement to steel production.
At scale and for the first time, it could commercially replace fossil fuels with carbon-free renewable energy.
It’s happening right now.
And we’re investing in it.


Solar Technology and Thermal Energy Storage

Helena is an investor in Heliogen.

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Heliogen has created the world’s first technology that can commercially replace fossil fuels with carbon-free, ultra-high temperature heat from the sun.

Extreme Heat

The Problem

The modern world relies heavily on fossil fuels to power our daily lives and the industries we depend on. The global fossil fuel industry generates more than $1 trillion each year, yet the consumption of fossil fuels simultaneously accounts for the bulk of greenhouse gas emissions in the United States.

Many heavy industries that require extreme temperatures overwhelmingly get that heat from fossil fuels.

Renewable power presents a potential solution to the negative externalities associated with the supply and consumption of fossil fuels, yet suffers from a lack of consistent, predictable, and reliable power generation. In the status quo, renewable assets such as wind turbines or solar panels only produce power when the wind is blowing or the sun is shining. Put differently, when the wind calms or the sun sets, wind turbines or solar panels stop producing energy. These patterns in renewable energy production do not necessarily match the patterns of demand for consumers, resulting in mismatched supply and demand.

In order to equalize supply and demand and provide a consistent, continuous supply of power, existing solutions include relying on dirty power generation assets (coal, gas, and petroleum powered generators) to make up for gaps in supply.

An Energy Vault gravity storage system from below.

Energy storage solutions are another major need. However, the world lacks a suite of industrially established storage technologies that provides safe, green, cost efficient, long term storage — which is partially why Helena also invested and partnered with storage solution Energy Vault.

This leaves a partial dependence on fossil fuels as the only viable choice today for consistent power supply and means that the world must continue to invest in dirty power generation no matter how much wind and solar is built. Moreover, these problems with renewable power today act as a barrier to the development and commercialization of technologies, both green and futuristic, that require cheap and clean energy to be viable.

A unit from leading carbon-capture company Climeworks. Helena supported the Swiss-based technology company via the non-profit Factory in the Sky Project.

For example, various carbon capture technologies today leverage highly energy intensive processes to capture a pure stream of CO2 from ambient air. There is existing concern around the cost of running carbon capture systems given energy use; however, there is also near consensus that carbon capture must play a role in our efforts to halt the warming of our planet.

Carbon capture technologies could scale up more quickly given a reliable supply of cheap renewable power. A solution, therefore, will not only directly reduce the carbon emissions associated with dirty power but also spur increased interest in other sustainable activities and leading-edge technologies.

The proliferation of green hydrogen powered vehicles, like this Toyota concept, as a major component of the world's transportation systems requires further advances in electrolysis.

Hydrogen fuel could serve as a green alternative to fossil fuels, depending on how it is produced. Hydrogen has a high energy efficiency and can be stored safely long term, as a gas or liquid. In fact, hydrogen is roughly three to seven times as efficient as fossil fuels (by weight, for gasoline and coal, respectively). However, despite being the most abundant element in the universe, hydrogen rarely exists in nature on its own.

Today, hydrogen is produced using a process called electrolysis. Electrolysis of water leverages the positive and negative charges of electricity to effectively force water molecules to break into constituent elements (hydrogen and oxygen). Unfortunately, the bulk of hydrogen is produced using electrolyzers powered by fossil fuels, meaning the hydrogen is not green. As the key inputs to electrolysis are water and electricity, if we can transition away from fossil fuels and power electrolysis of water with cheap renewable energy, then the hydrogen produced could be green (and cost efficient), providing society with an entirely clean alternative fuel. However, green hydrogen requires cheap renewable energy that can be delivered consistently and predictably – something we lack today.

The Solution


Heliogen seeks to leverage the sun’s power to solve many of the issues associated with renewable energy today. To do so, Heliogen develops and builds plants that generate energy from the sun and couples generation with long term thermal storage to provide a continuous supply of cheap renewable energy.

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Heliogen's first system in Lancaster, California

Heliogen’s plants concentrate the sun’s energy to capture solar heat to be used as power, producing extremely low cost energy. Because the plants not only generate industrial heat and power from the sun but also provide thermal storage (storing energy by heating up air and rocks), Heliogen’s sunlight refineries have a higher capacity factor than a standard solar power plant – able to rely on storage during bad weather or at night.


The result is a technology that can provide significantly cost-effective renewable energy more consistently than existing solutions, and the cheap energy produced allows the running of industrial processes that would otherwise be economically inefficient – for example creating the real possibility of replacing fossil fuels with green hydrogen fuel or scaling up cost efficient carbon capture technologies.

Heliogen’s core technology is their Sunlight Refinery™ plant, which uses mirrors and computer-vision to hyper-accurately concentrate sunlight. An automated, AI-driven system positions mirrors, called heliostats, to track and direct the sun’s energy toward a single focal point.


The Refinery allows the concentrated energy to heat up air and rock for thermal storage. The Refinery can then leverage the thermal storage to offer a number of renewable solutions to customers: HelioHeat, the delivery of heat for industrial processes; HelioPower, the delivery of electricity, generated by running HelioHeat through a power block; and HelioFuel, the delivery of hydrogen fuel, generated by running a large water electrolyzer using HelioPower.


Given the potential impact stemming from replacing fossil fuels, Heliogen is most focused on commercializing HelioFuel in order to develop increased interest in green hydrogen production and use. However, as mentioned in the previous section, the supply of cheap, green, consistent power is needed for more than green hydrogen production. Heliogen can help decarbonize industrial production of materials such as steel or iron (which often relies on dirty energy, producing significant emissions) by providing green HelioHeat or HelioPower.

Heliogen_Lancaster_Facility_5 with sign

As such, Helena believes the potential impact of Heliogen’s technology goes far beyond the sale of green hydrogen.

Sunlight Refineries represent a significant development when compared to other solar power generation systems. First, as compared to a standard photovoltaic system, Sunlight Refineries can provide power when solar panels otherwise could not – for example during bad weather or at night. Thus, the cost per unit of energy is lower for Heliogen when considered holistically, given a higher capacity factor (ignoring the cost to build and install).

Second, Sunlight Refineries incorporate advanced technology and design principles that we believe are increasingly necessary in industrial settings. The installation and maintenance of a Sunlight Refinery can be done robotically, and the positioning of heliostats, as mentioned, is optimized using artificial intelligence sensitive to the sun’s movement.


Moreover, Heliogen relies on a modular design with numerous small heliostats, minimizing the environmental impact or local disruption caused by the build and operating of a Sunlight Refinery. Third, and related, Heliogen invested heavily in improving the design, build, and operation of heliostats. As a result, Heliogen’s heliostats are significantly smaller and more cost-efficient to manufacture and operate than any standard heliostats on the market that Heliogen began with.

Heliogen solves many problems associated with renewable energy by providing a consistent supply of cheap solar energy. The technology will motivate the growth of other green technologies that require such a supply of cheap renewable energy, such as hydrogen fuel, while generally supporting the transition away from fossil fuels. Ultimately, Heliogen could play a crucial role in the necessary decarbonization of our daily lives and industries.

The Duck Curve

A helpful way to visualize this issue is known affectionately as the “Duck Curve.”

In the graph above, note the sharp decrease in demand for energy during mid-day, and the sharp increase in demand during the evening. Think about how this connects to your personal energy usage: you’re less likely to use electricity in your home around noon, when there’s an abundance of natural sunlight when and members of your household are at work or school vs. during the evenings, when the sun has set and you’re preparing dinner.

Capacity Factor

Renewable power generation assets generally suffer from a reliance on unpredictable and uncontrollable natural weather and phenomena. One key measure of a power generation asset is its capacity, or the maximum power the asset can produce (assuming running at full capacity). The capacity of the assets helps determine the cost per unit of energy and is determined by the manufacturer of the asset. However, though a wind turbine might have a large capacity, if the wind stops blowing, its capacity fails to illustrate that the turbine will not be producing power 24/7. Relying on the capacity to understand the cost of the power generated, then, would suggest an overly optimistic situation (artificially lowering costs).

A second measure, called capacity factor, is crucial to take into account both the theoretical capacity of an asset and the practical limits of its operation. Put simply, the capacity factor of a power generation asset measures the percentage of time that an asset produces power at its maximum theoretical capacity. Capacity factor therefore also measures the reliability of an asset. If the capacity factor of an asset is low, then that asset only produces power at maximum capacity during a small period of time each day – in other words, low capacity factor systems are highly unreliable. As expected, the capacity factors for renewable power assets are significantly lower than those of dirty power assets: about 57% and 47% for natural gas and coal, respectively, and about 35% and 25% for wind and solar, respectively (natural gas and coal assets are roughly twice as reliable as solar assets).

Since renewable power generation assets operate at capacity less often than dirty power generation assets, dirty power remains more reliable and cost efficient than renewable power. Until renewable power generation assets are built to operate with a high capacity factor, we will remain reliant at least partially on dirty power generation assets. Only once we raise the capacity factor of renewables will we then see the development and scaling up of other technologies that depend on reliable renewable energy (such as running electrolyzers to produce green hydrogen at low cost).

Negative Externalities

Externalities are the secondary and related outputs of activity on uninvolved parties, which in many cases are unintended. For example, the carbon emissions generated at coal power plants are not a desired output but instead a byproduct of generating power. Importantly, externalities have an impact on those not directly involved in the activity.

The pollution from a coal plant harms almost everyone living nearby. Externalities can be negative, as in the case of pollution, or positive, as in the case of education (bettering society, not just the students themselves). In the absence of proper legislation and regulation, no one is directly responsible for externalities.

Negative externalities pose significant problems when actors do not choose to handle their externalities of their own volition. However, clever companies figure out how to profit by taking ownership over negative externalities – for example, businesses selling goods made from pollutants.


Helena’s purpose is to identify solutions to global problems and implement them through projects. Each project is a separate, unique effort.

Sometimes, we believe that the most effective method to implement a project is through for-profit action, including investment and/or the founding and operation of businesses.

These projects are designated as “profit” on their associated project pages on this website. This page is an example of such a project.

To implement efforts through for-profit means, entities(s) including Helena Special Investments, LLC, a privately-owned limited liability company that operates in business activities that have the potential to transformatively address societal problems while targeting attractive returns to investors, are utilized.