# Karl Ludwig Kley

> Karl Ludwig Kley is a Series A investor at Bilfinger Venture Capital backing Fuel. See 3 investments, check sizes, portfolio and contact details. Updated Aug…

- Type: Angel Investor
- Fund: [Bilfinger Venture Capital](https://shizune.co/investors/profile/bilfinger-venture-capital)
- Location: Mannheim, Germany
- Total investments: 3
- Last investment: Apr 2014
- Lead investor: 0%
- Last updated: Aug 2026

Karl Ludwig Kley is a Series A investor at Bilfinger Venture Capital in Mannheim focused on Fuel and Energy. Dr. Karl Ludwig Kley has been Head of Executive Management at Bilfinger Venture Capital GmbH since April 2012. He has been with the Bilfinger Group since 2004. Following operational positions in Civil in both Germany and abroad as well as with Corporate Development at HSG Zander International, he most recently worked in Corporate Projects /M&A at Bilfinger SE where he accompanies several M&A transactions for Bilfinger SE.Dr. Kley is a civil engineering graduate and holds a doctorate in the same subject from the University of Karlsruhe.

## Contacts

5 contacts available for Karl Ludwig Kley: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/karl-ludwig-kley-2?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Fuel | 1 | 33% |
| Energy | 1 | 33% |
| Manufacturing | 1 | 33% |
| Renewable Energy | 1 | 33% |

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 2 | 67% |
| Series B | 1 | 33% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Klaren International | Klaren International employs a complete team of specialists. They have been involved in the self-cleaning fluidized bed heat exchange technology for more than thirty years.Klaren is a highly innovative technology development company which markets and sells complete heat exchange installations worldwide. These installations can be either new orseverely fouling existing installations revamped into a self-cleaning configuration. If necessary, they co-operate with the large international engineering companies to incorporate the self-cleaning heat exchange technology in all kinds of processing equipment, including complex heat recovery systems, chemical reactors, evaporators, reboilers and crystallizers.Klaren is not interested in the fabrication of the heat exchange installations and prefers to outsource the fabrication to competent manufacturing companies, which should also be acceptable to the actual end user of the equipment. Of course, they provide a full performance guarantee. | $2.7M | Series A | Apr 17, 2014 |  |
| Sunfire | Sunfire develops and manufactures systems for renewable industrial gas and fuel production. These substitutes for mineral oil and natural gas, known as e-Gas, e-Fuel or e-Chemicals, replace fossil fuels in existing infrastructures. The solid oxide cells (SOCs) used for the conversion process are also used as generators to provide electricity andheat.Sunfire’s vision is to make regenerative energy from sources such as wind farms, hydropower plants, and photovoltaic systems available wherever and whenever it is needed — not just when the wind is blowing, the waves are crashing or the sun is shining. | $8.8M | Series B | Feb 25, 2014 |  |
| Sunfire | Sunfire develops and manufactures systems for renewable industrial gas and fuel production. These substitutes for mineral oil and natural gas, known as e-Gas, e-Fuel or e-Chemicals, replace fossil fuels in existing infrastructures. The solid oxide cells (SOCs) used for the conversion process are also used as generators to provide electricity andheat.Sunfire’s vision is to make regenerative energy from sources such as wind farms, hydropower plants, and photovoltaic systems available wherever and whenever it is needed — not just when the wind is blowing, the waves are crashing or the sun is shining. | $6.6M | Series A | Nov 29, 2012 |  |

3 of 3 investments shown.

## Co-investors
- [Electranova Capital](https://shizune.co/investors/profile/electranova-capital) — VC Fund, 2 deals together
- [TotalEnergies Ventures](https://shizune.co/investors/profile/total-energy-ventures-international) — VC Fund, 2 deals together

## About Bilfinger Venture Capital

VC Fund · Mannheim, Germany

As an engineering and services group, Bilfinger develops, builds, maintains and operates plants and buildings for infrastructure, real estate, industry and the energy sector.Bilfinger Venture Capital invests in young and technology-oriented businesses which are related to the strategic and operational interests of the Bilfinger group. ThusBilfinger Venture Capital is part of Bilfinger´s innovation strategy.They encourage innovative ideas that provide answers to the challenges of their future business.They act as a strategic partner and want to make a decisive contribution to the success of the companies in their portfolio. In addition to their financial commitment, they pursue the establishment of a technological cooperation between Bilfinger business units and start-ups.

2 contacts available at Bilfinger Venture Capital.

| Name | Title | Profile |
| --- | --- | --- |
| Karl Ludwig Kley | Managing Director | https://shizune.co/investors/profile/karl-ludwig-kley-2 |
| Benedict Boesel | Investment Manager | https://shizune.co/investors/profile/benedict-boesel |

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## FAQ

### What does Karl Ludwig Kley invest in?

Karl Ludwig Kley invests primarily in Fuel, Energy and Manufacturing startups, most often at Series A and Series B stage. Most of the 3 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact Karl Ludwig Kley?

For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

### When did Karl Ludwig Kley last invest?

The most recent investment recorded for Karl Ludwig Kley closed in Apr 2014. Shizune tracks 3 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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