What SUSI Partners does

SUSI Partners is a Swiss asset manager specializing exclusively in mid-market energy transition infrastructure investments for institutional investors. Founded in 2009/2014, the firm operates three distinct strategies: Equity (core+ and value-add investments in operating renewable energy assets and platforms), Credit (senior-secured financing solutions for energy efficiency and infrastructure-as-a-service business models), and Asia (Southeast Asian emerging market energy transition infrastructure). The firm invests up to EUR 150 million per opportunity across solar PV, onshore wind, battery storage, energy efficiency, and EV charging technologies. SUSI also operates and develops a portfolio of platform companies including Plico (Australian residential solar/battery), Elaway (Nordic EV charging), Genera (Italian energy efficiency), Encore (US brownfield solar), and ACCV (Vietnam C&I renewables), often taking majority stakes with active operational involvement. Following its January 2026 acquisition by UK-based Gresham House, SUSI operates as part of a EUR 3.1 billion combined energy transition platform, ranking among Europe's top 10 energy transition asset managers. Revenue is generated primarily through recurring management fees on committed/invested capital across multiple fund vintages (cumulative commitments exceeding EUR 2 billion across all strategies) plus performance-based carried interest upon exits. The firm serves pension funds, insurance companies, sovereign wealth funds, development finance institutions, and other professional investors globally, with offices in Zug, Zurich, Frankfurt, Singapore, and Triesen.

Name

SUSI Partners

Legal name

Gresham House Europe AG

Website

https://susi-partners.com

Company type

Private

Founded year

2014

Operating status

Acquired

Headcount range

51–100 employees

Short description

SUSI Partners is a Swiss asset manager specializing exclusively in mid-market energy transition infrastructure investments (solar, wind, storage, energy efficiency, EV charging) for institutional investors across Europe, OECD markets, and Southeast Asia.

Ownership category

akta.pro rank

Product category

Sustainable Infrastructure Fund Management

NAICS

Portfolio Management and Investment Advice (523940), Funds, Trusts, and Other Financial Vehicles (525)

SIC

Investment Advice (6282)

akta.pro primary industry

Renewable Energy Infrastructure (FSAAAKAG)

akta.pro secondary industries

Renewables & Energy Transition Funds (Solar, Wind, Hydrogen, CCUS) (FSANAEAD), Renewable Energy & Energy Transition Funds (FSANAJAB), Renewable Energy Asset Management (Solar/Wind/Hydro/Geothermal) (EUAEAMAB)

Keywords

• Sustainable energy infrastructure
• Renewable energy investments
• Energy transition funds
• Institutional asset management
• Green infrastructure investing

Headquarters

HQ city

Zug

HQ country

Switzerland

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Asset Management Fees: SUSI Partners generates revenue through management fees charged on assets under management across its fund products including SUSI Energy Transition Fund OECD, SUSI Energy Storage Fund, SUSI Renewable Energy Fund II, credit funds (SEEF I, SEEF II, SEETCF, EEEF), and SUSI Asia Energy Transition Fund. Fees are typically calculated as a percentage of committed capital or invested capital.
2. Performance Fees / Carried Interest: As a private markets investment manager, SUSI earns performance-based fees upon successful exits and meeting return targets for institutional investors. The company completed the full fund lifecycle for SUSI Renewable Energy Fund II (launched 2014) with final exit of Danish wind portfolio in January 2026.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels7 records

Core offering

SUSI Partners is a Swiss asset manager that invests in mid-market energy transition infrastructure on behalf of institutional investors through dedicated equity, credit, and Asia fund strategies. It manages vehicles such as the SUSI Energy Transition Fund (OECD), Energy Storage Fund, Energy Efficiency credit funds, and the SUSI Asia Energy Transition Fund, alongside controlling or co-controlling operating platforms in solar PV, onshore wind, battery storage, EV charging, and energy efficiency. Revenue is generated primarily through asset management fees on committed/invested capital and performance-based carried interest.

Product overview

SUSI Partners operates as a multi-product energy transition investment manager offering three distinct fund strategies differentiated by risk-return profile and geographic focus. The Equity strategy includes flagship products like the SUSI Energy Transition Fund (OECD) and SUSI Energy Storage Fund, as well as the now-exited SUSI Renewable Energy Fund II. The Credit strategy comprises a series of energy efficiency credit funds including The European Energy Efficiency Fund and multiple SUSI Energy Efficiency Funds. The Asia strategy centers on the SUSI Asia Energy Transition Fund targeting Southeast Asian markets. Across all strategies, SUSI manages platform investments in portfolio companies including residential solar/storage (Plico), EV charging (Elaway), and various renewable energy developers. Following the January 2026 acquisition by Gresham House, the combined entity manages approximately €2.7 billion across these strategies and platforms, ranking among Europe's top 10 energy transition investors.

Differentiator

Problem solved

Functional benefit

Brands

• Plico: Consumer brand for residential solar PV and battery systems operated by Starling Energy Group in Australia
• OASIS
• SARA
• SESP
• Stable Energy Solutions

Products and services

• SUSI Energy Transition Fund (OECD) Flagship equity fund with evergreen structure investing in the development, construction, acquisition and operation of energy transition projects and assets in Europe and other OECD markets. Available to qualified institutional investors; EUR 555 million committed.
• SUSI Energy Storage Fund First institutional fund worldwide specifically focused on energy storage investments, including battery storage and related infrastructure. Capital commitments of EUR 252 million; launched 2016, hold period to 2028.
• SUSI Renewable Energy Fund II Fund investing in large-scale onshore wind and solar PV plants across Europe. Capital commitments of EUR 383 million; launched 2014, ended 2026 with final exit of Danish onshore wind portfolio to NRGi Renewables.
• The European Energy Efficiency Fund Public-private partnership supported by the European Commission and private investors, financing energy efficiency, renewable energy and sustainable urban transport projects in the public sector. Capital commitments of EUR 226 million; current fund size EUR 167 million.
• SUSI Energy Efficiency & Transition Credit Fund Third credit strategy product providing senior-secured financing solutions for Infrastructure-as-a-Service business models. Capital commitments of EUR 201 million; launched 2022, ending 2038.
• SUSI Energy Efficiency Fund II Second credit strategy product providing senior-secured financing solutions for Infrastructure-as-a-Service business models. Capital commitments of EUR 289 million; launched 2019, ending 2035.
• SUSI Energy Efficiency Fund First credit strategy product providing senior-secured financing solutions for Infrastructure-as-a-Service business models. Capital commitments of EUR 200 million; ending 2027.
• SUSI Asia Energy Transition Fund Fund investing in energy transition infrastructure projects in Southeast Asia, targeting growth markets with positive environmental and social impact. Capital commitments of USD 164 million; launched 2021, maturing 2034.
• Plico (Starling Energy Group) Leading Australian provider of residential solar PV and battery systems under the Plico consumer brand, with a Virtual Power Plant (VPP) that integrates household solar and battery systems to support grid stability. SUSI acquired a 50% stake in 2021.
• Elaway Nordic EV charging infrastructure operator specializing in charging solutions for residential properties in Norway, with growing presence in Sweden and Germany. Operates its charging network as a virtual power plant providing flexibility services to grid operators through smart charging.
• Encore Renewable Energy Vermont-based sustainable energy company specializing in the development of distributed solar PV and battery storage projects on contaminated lands and sites.
• APAL MW French developer of onshore wind and photovoltaic projects.
• Genera Italian energy services company specialized in the implementation, financing and operation of energy efficiency measures for commercial, industrial and public infrastructure.
• ReFeel New Energy Italian development platform for solar PV and battery storage project development, construction and operation. Secured a 15-year capacity market contract for a battery storage project.
• SARA (Sustainable Asia Renewable Assets) Renewable energy platform founded in partnership with co-investors British International Investment and FMO to build a substantial portfolio of greenfield renewable energy projects in selected Southeast Asian markets.
• OASIS Commercial and industrial (C&I) solar PV platform in Southeast Asia formed through consolidation of multiple C&I solar investments; ACCV will form a central part of this platform.
• SESP (Sustainable Energy Solutions Partnership) Energy efficiency platform focusing on circular economy, commercial and industrial biogas, and waste heat recovery projects in Southeast Asia.
• Asia Clean Capital Vietnam (ACCV) Vietnamese on-site renewable energy developer providing rooftop solar and battery energy storage systems to commercial and industrial customers; founded in 2020 and one of the leading C&I renewable energy developers in Vietnam.
• Stable Energy Solutions C&I solar PV platform with its own development and asset management team focusing on development, construction and operation of C&I solar PV projects in Southeast Asia.
• Sustainable Pacific Impact Renewable Energy Joint venture with Pacific Impact Development focusing on greenfield development of large-scale solar PV, wind and hydropower projects, with the capability to also provide financing, construction and operation of developed assets.

Quantifiable outcome

• 4.5 million tonnes CO2 avoided emissions per year (end 2024); 21.8 million tonnes over technology lifetime
• +3 more outcomes

Named customers9 records

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Four partnerships are on record, tiered major and minor.

• Asia Clean Capital Vietnam (ACCV)majorOthers · 11 March 2026Gresham House (through SUSI Asia Energy Transition Fund's OASIS platform) acquired Asia Clean Capital Vietnam, a Vietnamese commercial and industrial renewable energy developer founded in 2020. ACCV provides distributed clean energy solutions including rooftop solar and battery storage to industrial clients in Vietnam, becoming central to the OASIS C&I renewable energy platform.
• NRGi RenewablesminorOthers · 5 January 2026Danish local utility acquired SUSI's 89 MW Danish onshore wind portfolio (25 turbines, 4 locations, 275 GWh annual production) from SUSI Renewable Energy Fund II, marking the fund's final exit. NRGi becomes one of Denmark's largest renewable energy producers.
• Alerion Clean PowerminorOthers · 10 September 2025Italian renewable energy company acquired 14.4 MW Milestone wind farm in County Tipperary, Ireland from SUSI Renewable Energy Fund II. The sale represented over 80% of SREF II assets successfully divested.
• Pacific Impact DevelopmentmajorStrategic or Co-development PartnerJoint venture partner for Sustainable Pacific Impact Renewable Energy platform, focusing on new development of utility-scale solar PV, wind, and hydropower projects with possibility to also provide financing, construction, and operations.

Scale indicators12 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Quinbrook Infrastructure Partners: Specialist infrastructure manager focused on the energy transition, with funds targeting renewables, storage, and grid infrastructure. Comparable as a specialist mid-market energy transition fund manager serving institutional capital.
• Gresham House: UK-based specialist asset manager that acquired SUSI Partners in January 2026 to form a combined energy transition platform. Directly comparable as a specialist asset manager with energy transition / sustainable infrastructure strategies serving institutional investors. Now the parent of SUSI's strategies.
• NextEnergy Capital: London-based specialist fund manager focused on solar energy infrastructure investments, with multiple fund vintages (e.g., WiseEnergy). Highly comparable mid-market renewable energy infrastructure fund manager targeting institutional investors in Europe and OECD markets.
• Foresight Group: UK-listed specialist fund manager with significant renewable energy infrastructure and energy transition strategies, including solar, wind, and battery storage. Direct competitor in the European mid-market institutional renewable energy infrastructure space.
• Greencoat Capital: UK-based specialist infrastructure manager focused on renewable energy funds (wind, solar, bioenergy) for institutional investors. Operates listed (Greencoat UK Wind) and private fund structures, directly competing with SUSI in European renewable infrastructure mandates.
• Glennmont Partners: European clean energy infrastructure fund manager (acquired by Nuveen/BlackRock alternatives), managing funds focused on solar, wind, and storage across Europe. Directly comparable mid-market renewable energy infrastructure investment manager for institutional investors.
• Climate Fund Managers (CFM): Joint venture between FMO and Sanlam, focused exclusively on climate and energy transition infrastructure in emerging markets including Southeast Asia. Highly comparable to SUSI's Asia strategy and mission-aligned impact investing focus.
• Equitix: European infrastructure investment manager with focus on essential infrastructure including energy transition assets. Comparable as a mid-market European infrastructure fund manager serving institutional investors with similar risk-return profiles.

Broad incumbents

• Macquarie Asset Management (Green Investment Group): Global asset manager with a major dedicated Green Investment Group focused on renewable energy, energy storage, and energy transition infrastructure. Operates at much larger scale than SUSI but competes for the same institutional capital pool and increasingly targets mid-market opportunities.
• Brookfield Renewable Partners: One of the world's largest publicly listed renewable energy platforms with operating, development, and investment capabilities across hydro, wind, solar, and storage. Acquired Alba Renewables from SUSI's Asia fund. A scale incumbent operating across the renewable infrastructure value chain.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/susi-partners-ag

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Subsidiaries15 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments5 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SUSI Partners