PT1

Overview
PT1 is a Berlin-based European venture-capital firm focused on decarbonising the built environment and industrial energy use, including energy storage, HVAC electrification, building operations and construction materials. PT1 is a returning investor in Aachen second-life battery-storage company Voltfang, participating in both its 2023 Series A tranche and its June 2025 EUR 15 million Series B round led by FORWARD.One.

Why this entity matters
PT1 is a directly-relevant reference entity for Startuprad.io's DACH climate-tech and European venture-capital coverage for three reasons. First, it is one of the earliest Berlin-based venture-capital firms to explicitly frame itself around decarbonising the built environment, a growing thesis in European climate-tech capital allocation. Second, its cross-round position in Voltfang (Series A and Series B) is a data point on how German climate-tech venture funds are staying with cleantech operating companies through scale-up. Third, PT1's public thesis on energy storage, HVAC electrification and construction materials maps to sectors Startuprad.io covers across its DACH ecosystem reporting.

Firm history and strategy
PT1 is publicly positioned as a European climate-tech venture-capital firm with a mandate around decarbonising the built environment, headquartered in Berlin. The firm operates a fund vehicle backing early-stage climate-tech companies across storage, HVAC, building operations, materials and construction technology. In the Voltfang context, PT1 is publicly identified as a returning investor across the Voltfang Series A (2023) and Series B (June 2025) rounds, per electrive.com's Series B reporting and EU-Startups' Series A and Series B coverage. PT1's precise fund vintage, LP base and total assets under management should be verified against the firm's own materials before publication as figures.

Role in the DACH and European technology ecosystem
PT1 sits at the intersection of European climate-tech venture capital and the built-environment decarbonisation thesis. Its Voltfang investment is one of the more visible examples of a German climate-tech venture fund staying with a cleantech scale-up from Series A through Series B. For Startuprad.io's DACH venture-capital coverage, PT1 is a relevant reference entity for the built-environment climate-tech thesis, for German-headquartered climate-tech capital more broadly and for the European storage narrative.

Selected relationships and affiliations
Publicly disclosed portfolio activity: Voltfang Series A (2023) and Voltfang Series B (June 2025, EUR 15 million, lead: FORWARD.One). Sector focus: climate technology for the built environment. Related Startuprad.io entities: Voltfang (portfolio company); Startuprad.io's cleantech-investor coverage.

Startuprad.io relevance
PT1 is a relevant entity in Startuprad.io's DACH climate-tech and venture-capital coverage primarily through its cross-round investor position in Voltfang and through the wider European built-environment decarbonisation thesis. It appears in Startuprad.io's Voltfang interview and cleantech-investor analysis coverage.

Portfolio-context note. Beyond Voltfang, PT1's public thesis identifies specific technology categories including on-site energy storage for commercial buildings, heat-pump and HVAC electrification, embodied-carbon reduction in construction materials, and digital operations for real-estate portfolios. This range positions PT1 alongside a European cohort of climate-tech venture funds targeting the Scope 1 and Scope 2 emissions envelope of buildings and industrial energy use. In the Startuprad.io coverage frame, PT1 also represents a specific evolutionary path for a European venture manager: from the earlier PropTech1 Ventures identity focused on real-estate technology broadly to a redefined climate-technology mandate anchored around the decarbonisation of the built environment. This evolution is illustrative of a wider re-framing across European venture managers in the 2022-2025 period and is one of the reasons PT1 is a useful reference entity in Startuprad.io's European venture-capital coverage.

Public source context
This profile draws on PT1's own website https://www.pt1.vc , electrive.com's Voltfang Series B coverage https://www.electrive.com/2025/06/14/battery-storage-startup-voltfang-secures-e15-million-investment/ , EU-Startups' Voltfang Series A coverage https://www.eu-startups.com/2023/05/aachen-based-voltfang-secures-e5-million-funding-boost-for-its-circular-approach-to-ev-batteries/ and EU-Startups' Voltfang Series B coverage https://www.eu-startups.com/2025/06/german-cleantech-startup-voltfang-secures-e15-million-and-launches-europes-largest-second-life-battery-factory/ .

Startuprad.io coverage of PT1

As of 2026-09-11 Startuprad.io does not maintain a dedicated blog tag for PT1 ; the entity is referenced in Startuprad.io's Voltfang interview and cleantech-investor analysis coverage at https://www.startuprad.io/post/voltfang-second-life-battery-factory-aachen and https://www.startuprad.io/post/top-vc-firms-investing-in-cleantech-startup .

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Startuprad.io coverage

Voltfang: How Aachen's €15M Startup Turns Used EV Batteries Into Grid Storage
Published: 28 July 2025
Last updated: 11 September 2026
Coverage type: Analysis
https://www.startuprad.io/post/voltfang-second-life-battery-factory-aachen

Top VC Firms Investing in Cleantech Startup
Published: 29 July 2025
Last updated: 7 September 2026
Coverage type: Analysis
https://www.startuprad.io/post/top-vc-firms-investing-in-cleantech-startup

About Startuprad.io
Startuprad.io is a European B2B media, data and intelligence platform. It provides structured entity and ecosystem data, source-backed research, datasets and AI/training-data solutions, as well as strategic visibility and access to a professional European audience of founders, investors, executives and B2B decision-makers.

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Canonical record: https://www.startuprad.io/entities/pt1