# Tarja Takki-Halttunen

> Tarja Takki-Halttunen is a funding round investor at Halton Ventures backing Smart Building. See 2 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Halton Ventures](https://shizune.co/investors/profile/halton-ventures)
- Total investments: 2
- Last investment: May 2023
- Lead investor: 50%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/tarjatakki

Tarja Takki-Halttunen is a funding round investor at Halton Ventures focused on Smart Building and Energy. Tarja Takki-Halttunen

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Smart Building | 2 | 100% |
| Energy | 1 | 50% |
| GreenTech | 1 | 50% |
| Smart Cities | 1 | 50% |
| Manufacturing | 1 | 50% |

12 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Funding Round | 1 | 50% |
| Venture - Series Unknown | 1 | 50% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Soletair Power | Soletair Power is a Finnish startup founded in 2016, operating in the field of Direct Air Capture technology. The company captures CO2 from the air by retrofitting buildings' ventilation systems with carbon capture technology, resulting in low building emissions. Captured carbon dioxide can be mineralized, stored, transported, and used as rawmaterials to produce synthetic products. In 2020, Wärtsilä, together with Soletair Power and Q-Power, created the world's first Power-to-X unit that can produce fuel out of thin air at the Finland pavilion in Expo 2020 Dubai. Since then, the company has successfully delivered several carbon capture units and signed deals in Germany, Denmark, Hungary, Finland and UAE. | $789.5K |  | May 09, 2023 |  |
| Smart Heating | Smart Heating focus on hybrid heating systems for real estates. Smart Heating implements energy-efficient heating solutions for more than 100 buildings. |  | Venture - Series Unknown | Mar 11, 2022 |  |

2 of 2 investments shown.

## Co-investors
- [Soren Jensen Radgivende Ingeniorfirma](https://shizune.co/investors/profile/soren-jensen-radgivende-ingeniorfirma) — VC Fund, 1 deal together

## About Halton Ventures

VC Fund · Helsinki, Finland

Halton Ventures operates as a venture capital firm.

1 contacts available at Halton Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Tarja Takki-Halttunen | Chairwoman | https://shizune.co/investors/profile/tarja-takki-halttunen-9e7b |

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### Similar stage
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## FAQ

### What does Tarja Takki-Halttunen invest in?

Tarja Takki-Halttunen invests primarily in Smart Building, Energy and GreenTech startups, most often at Funding Round and Venture - Series Unknown stage. Most of the 2 investments tracked by Shizune back companies in Finland. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Tarja Takki-Halttunen last invest?

The most recent investment recorded for Tarja Takki-Halttunen closed in May 2023. Shizune tracks 2 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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