# Fabian Heilemann

> Fabian Heilemann is a seed investor at Leaders for Climate Action backing Renewable Energy. See 16 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Leaders for Climate Action](https://shizune.co/investors/profile/leaders-for-climate-action)
- Total investments: 16
- Last investment: May 2026
- Lead investor: 38%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/dr-fabian-heilemann-a355a9/
- X (Twitter): https://twitter.com/heilemannfabian?lang=en
- Website: http://aenu.com

Fabian Heilemann is a seed investor at Leaders for Climate Action focused on Renewable Energy and Battery. Fabian Heilemann is the Founder & CEO of the impact tech fund AENU. He previously co-founded Forto, DailyDeal as well as Leaders for Climate Action, and was General Partner at Earlybird. Fabian attended Bucerius Law School, Heidelberg University and Stanford GSB.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1.6M–$7.9M |
| Pre-Seed | $2.5M–$3.1M |
| Series A | $8.8M–$18M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Renewable Energy | 4 | 25% |
| Battery | 2 | 13% |
| Energy Storage | 2 | 13% |
| Apps | 1 | 6% |
| Solar | 1 | 6% |

26 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 6 | 38% |
| Pre-Seed | 4 | 25% |
| Series A | 1 | 6% |
| Funding Round | 1 | 6% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Germany | 6 | 38% |
| United Kingdom | 2 | 13% |
| France | 1 | 6% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Regulate | Regulate is a wellness and performance company that provides science-backed breathwork programs and a mobile app designed for professionals and organizations. The company focuses on improving focus, stress regulation, resilience, energy, sleep, and overall workplace wellbeing through guided breathing exercises tailored for the workday. | $1.6M | Seed | May 12, 2026 |  |
| Entrix | Entrix is an optimisation and trading platform for grid-scale battery storage that accelerates the transition towards a clean energy future. Our mission is to enable the most effective use of green energy and to ensure the reliability of the future energy system. We provide state-of-the-art technology and services to both asset owners and potentialinvestors across the globe. | $49.9M | Series B | Mar 25, 2026 |  |
| Reneo | Reneo is the leading end-to-end asset transformation- and decarbonization platform for residential real estate in Germany. Using proprietary software technology to identify and realize the ecological and economic potential of stranded assets. | $46.9M |  | Feb 20, 2025 |  |
| EPYR | EPYR is an energy technology company focused on advancing large-scale industrial decarbonization and sovereignty.EPYR Combine innovation and practicality to simplify electrification through innovative thermal energy storage solutions, empowering industries to seamlessly transition to renewable energy for a sustainable future. | $3.1M | Pre-Seed | Feb 03, 2025 |  |
| Voltfang | We integrate used electric car batteries into a battery storage system and thus build up a decentralized storage network. | $8.8M | Series A | Oct 04, 2024 |  |
| alcemy | Concrete is the most widely used building material on our planet. The only thing mankind uses more of is water. With a wave of urban development coming in the next few decades, concrete is also a rapidly growing trillion-dollar market. However, cement and concrete production is responsible for 8% of the global CO2 emissions, making its growth a bigcause for concern.Low-carbon concrete exists - but until now it has been too sophisticated to be produced reliably and on a large scale. It contains very little burnt limestone - responsible for the strength of concrete and CO2 emissions. This makes low-carbon concrete vulnerable to fluctuations in raw materials and operating conditions and thus difficult to produce with reliable quality. Adding to the challenge: the final quality of concrete can only be measured weeks AFTER it has been processed on the construction site - far too late to be corrected. This is why our world is still built on more robust, high-carbon concrete. Using alcemy's software, cement and concrete producers receive precise quality predictions already during production. Based on these prediction models, our AI identifies which production parameters need to be adjusted to mitigate the impact of fluctuations. Thus, the quality of cement and concrete can be optimized BEFORE delivery – for the first time in history.The result is significantly more consistent product quality, allowing producers to safely replace burnt limestone with less expensive, low-carbon materials found in nature. In this way, they can also avoid payments for CO2 emission certificates in the EU. Saving costs, bringing production processes up to speed for 21st century concrete recipes, and saving half of Europe’s CO2 emissions goes hand in hand at alcemy. Join us on our journey to make low-carbon concrete a reality! | $10M | Venture - Series Unknown | Jul 05, 2024 |  |
| Entrix | Entrix is an optimisation and trading platform for grid-scale battery storage that accelerates the transition towards a clean energy future. Our mission is to enable the most effective use of green energy and to ensure the reliability of the future energy system. We provide state-of-the-art technology and services to both asset owners and potentialinvestors across the globe. | $18.5M | Series A | Feb 01, 2024 |  |
| Metris Energy | Metris Energy is the first AI-powered solar energy platform designed for commercial property owners. Its objective is to convert every commercial building into a power plant. It makes solar adoption a no-brainer for business property owners by making it simple and profitable to install smart, renewable energy devices on their premises. | $2.5M | Pre-Seed | Jan 24, 2024 |  |
| Entrix | Entrix is an optimisation and trading platform for grid-scale battery storage that accelerates the transition towards a clean energy future. Our mission is to enable the most effective use of green energy and to ensure the reliability of the future energy system. We provide state-of-the-art technology and services to both asset owners and potentialinvestors across the globe. | $6.4M | Seed | Sep 06, 2023 |  |
| Voltfang | We integrate used electric car batteries into a battery storage system and thus build up a decentralized storage network. |  | Pre-Seed | Feb 22, 2022 |  |

10 of 16 investments shown.

## Co-investors
- [ABACON](https://shizune.co/investors/profile/abacon-capital) — VC Fund, 3 deals together
- [Arvantis Group](https://shizune.co/investors/profile/arvantis-group) — VC Fund, 3 deals together
- [Enpal](https://shizune.co/investors/profile/enpal) — VC Fund, 3 deals together
- [Saarbruecker 21](https://shizune.co/investors/profile/saarbruecker-21) — VC Fund, 3 deals together
- [Allianz](https://shizune.co/investors/profile/allianz) — VC Fund, 2 deals together
- [Daphni](https://shizune.co/investors/profile/daphni) — VC Fund, 2 deals together

## About Leaders for Climate Action

VC Fund · Berlin, Germany

Leaders for Climate Action is an entrepreneurial community that drives climate action.

5 contacts available at Leaders for Climate Action.

| Name | Title | Profile |
| --- | --- | --- |
| Boris Hageney | Member and European Expansion Supporter | https://shizune.co/investors/profile/boris-hageney |
| Emmanuel Nataf | Member | https://shizune.co/investors/profile/emmanuel-nataf |
| Fabian Heilemann | Co-Founder | https://shizune.co/investors/profile/fabian-heilemann |
| Lawrence Leuschner | Founding Supporter | https://shizune.co/investors/profile/lawrence-leuschner |
| Philippe Singer | Managing Director & Co-Founder | https://shizune.co/investors/profile/philippe-singer |

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## FAQ

### What does Fabian Heilemann invest in?

Fabian Heilemann invests primarily in Renewable Energy, Battery and Energy Storage startups, most often at Seed and Pre-Seed stage. Most of the 16 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Fabian Heilemann's check size?

Fabian Heilemann typically joins rounds of $1.6M–$7.9M at Seed, $2.5M–$3.1M at Pre-Seed and $8.8M–$18M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Fabian Heilemann participates in.

### When did Fabian Heilemann last invest?

The most recent investment recorded for Fabian Heilemann closed in May 2026. Shizune tracks 16 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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