What is the Y-tunnus number of Terawatt Oy?

Terawatt Oy is registered with PRH / YTJ under Y-tunnus 1912843-4.

What is the revenue of Terawatt Oy?

Terawatt Oy reported revenue of 27,6 t. € in 2024.

Lasse Kalervo Impiö is the CEO of Terawatt Oy, in role since 2022.

Kari Matti Antero Kohvakka chairs the board of Terawatt Oy, in role since 2024.

Terawatt Oy's registered address is Tiilipojanlenkki 9.

OYActive

Y-tunnus 1912843-4Tiilipojanlenkki 9, 01720 VantaaElectrical installation· NACE 4321Est. 2004 · 21 years old— employeeswww.terawatt.fi

Actively employed in the business

Name	Role	Member since
Current (2)
LK Lasse Kalervo Impiö Chief Executive Officer	Chief Executive Officer	2022
HJ Hannes Juhani Kokko Confidential Clerk	Confidential Clerk	2018

Former (5)


OA Osmo Antero Valovirta Audit	Audit	2022 – 2023
ES Erkki Samuli Nissilä Confidential Clerk	Confidential Clerk	2018 – 2022
JT Jussi Tapani Holma Chief Executive Officer	Chief Executive Officer	2018 – 2022

Non-executive oversight

Name	Role	Member since
Current (2)
KM Kari Matti Antero Kohvakka Chairperson	Chairperson	2024
AJ Antti Juhani Heinola Board of Directors	Board of Directors	2024

Former (7)


LK Lasse Kalervo Impiö Board of Directors	Board of Directors	2020 – 2022
JT Jussi Tapani Holma Board of Directors	Board of Directors	2022 – 2022
SK Sari Kristiina Kaikkonen Board of Directors	Board of Directors	2021 – 2023

As of last annual report

Shareholder	Type	Ownership	Votes	Since
We-Group Oy	Company	100%	100%	2023

Beneficial ownership (UBO) data access is restricted in Denmark as of September 2025 per the EU 6th AML Directive. Learn more.