TRESUN

What TRESUN does

TRESUN S.r.l. is an Italian private limited company founded in 2014 by CEO Massimo Alfredo Lauria, headquartered in Belpasso, Sicily (operational HQ at Via Luigi Pirandello, Piano Tavola; registered office also referenced at Santa Maria di Licodia). The company provides integrated utility-scale photovoltaic services organized across four core pillars: O&M (preventive and corrective maintenance, 24/7 monitoring, surveillance, panel cleaning, vegetation management), EPC (turnkey plant construction), Revamping and Repowering (modernization of aging assets with 2–3 year stated ROI), and component-level electronic and inverter repair (marketed under the "Chasing the Sun" sub-brand), the latter including certified repair as an official Sungrow partner. Its 24/7 Control Room operates 27 workstations monitoring over 2 GW of installed capacity, while direct O&M contracts cover 160+ plants totaling more than 387 MWp across Italy.

Underlying technology combines proprietary surveillance solutions and an interactive diagnostic system developed in-house with thermography and structured telemetry ingestion from inverters, string boxes and meters. The company holds SOA attestation and a comprehensive certification stack (ISO 9001, 14001, 45001, 37001, SA 8000, UNI PDR 125, ISO 14064-1), qualifying it to operate on restricted sites including airports and military installations. The fleet comprises 54 vehicles supporting nationwide field service delivery.

The business model mixes recurring managed-services revenue from long-term O&M contracts with institutional investors and multi-utilities, project-based EPC delivery for new builds, professional-services revenue from revamping/repowering interventions, and transactional component repair. Go-to-market is direct enterprise sales with a dedicated commercial team targeting investment funds, multi-utilities and developer clients; named customers include A2A, Obton Group, Samag and GRValue. Ancillary distribution runs through an e-commerce storefront (tresun.store). Geographic operations are Italy-only as of October 2024, with a Milan executive office opened July 2025 signaling intent toward European expansion. Revenue is described qualitatively by Forbes as "several million euros"; headcount is approximately 192–198 employees; no external funding rounds have been disclosed.

Name

TRESUN

Legal name

Tresun S.r.l.

Website

https://tresun.it

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

51–100 employees

Short description

TRESUN is an Italian renewable-energy services firm providing integrated O&M, EPC, revamping and component-level inverter/electronics repair for utility-scale photovoltaic plants, serving institutional investors, multi-utilities and large asset owners across Italy.

Ownership category

akta.pro rank

Product category

Solar O&M and EPC Services

NAICS

Solar Electric Power Generation (221114), Electronic and Precision Equipment Repair and Maintenance (81121)

SIC

Switchgear & Switchboard Apparatus (3613), Measuring & Controlling Devices, Nec (3829)

akta.pro primary industry

Utility-Scale Renewable O&M (Solar, Wind, Hydro, Geothermal) (EUAMAGAA)

akta.pro secondary industries

Major Component Service & Overhauls (Gearboxes, Blades, Generators, Inverters, Turbines) (EUAMAGAF), Repowering, Retrofit & Life-Extension (Inverter Replacements, Tracker Upgrades, Controls) (EUACAGAJ), Spare Parts, Inventory & Supply Chain Management (Warehousing, Logistics, Obsolescence) (EUAMAGAM), Electrical Systems O&M (Substations, Transformers, Switchgear, Protection & Controls) (EUAMAGAH)

Keywords

• Solar O&M services
• Photovoltaic EPC contracting
• Utility-scale solar maintenance
• Solar plant revamping
• Inverter repair services

Headquarters

HQ city

Belpasso

HQ country

Italy

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. O&M (Operations & Maintenance) Contracts: Recurring maintenance contracts for utility-scale photovoltaic plants covering preventive and corrective maintenance, monitoring, cleaning, vegetation management, and surveillance. Revenue is recurring from long-term client relationships with investment funds, multi-utilities, and company life clients. The company manages 160+ plants totaling over 387 MWp.
2. EPC (Engineering, Procurement & Construction): One-time project-based revenue from designing, procuring materials for, and constructing turnkey utility-scale photovoltaic plants. Covers full lifecycle including post-construction handover and after-sales assistance.
3. Revamping & Repowering: Project-based revenue from modernizing, upgrading, and enhancing existing photovoltaic plants through component replacement, redesign, and optimization. Addresses natural degradation, outdated design choices, and regulatory compliance, with ROI achievable in 2-3 years.
4. Repair & Regeneration Services: Component-level repair services for inverters (string and centralized), UPS, electronic boards, and electromechanical equipment. Includes both in-laboratory and on-site interventions via 24/7 mobile workshop. Revenue is transactional per repair event, with framework agreements with major sector suppliers enabling rapid parts supply.
5. Engineering & Specialist Technical Services: Integrated engineering services covering BT/MT/AT engineering, reverse engineering, CC optimization, structural design, monitoring system design, civil works, and BOS auxiliary engineering. Specialized on-site testing and certification services are also provided.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

TRESUN provides utility-scale photovoltaic Operations & Maintenance (O&M) and Engineering, Procurement & Construction (EPC) services to investment funds, multi-utilities, and large solar asset owners across Italy. Its offering spans 24/7 remote monitoring through a proprietary Control Room, preventive and corrective maintenance, revamping and repowering of aging plants, turnkey EPC construction, and component-level repair of inverters, UPS, electronic boards, and electromechanical equipment. The company manages over 387 MWp across 160+ plants while its Control Room oversees more than 2 GW of installed capacity.

Product overview

Tresun operates as an integrated photovoltaic services company offering utility-scale O&M (Operation & Maintenance) and EPC (Engineering, Procurement & Construction) solutions. The portfolio is organized around four core service pillars: (1) Engineering Services covering design, construction, and specialized testing; (2) O&M Services including 24/7 monitoring, preventive/corrective maintenance, surveillance, panel cleaning, and green maintenance; (3) EPC and Repowering/Revamping for plant construction and modernization; and (4) a dedicated Repair division (Chasing the SUN Electronics) offering component-level repair of inverters, UPS systems, electronic boards, and electromechanical equipment across all brands, available both in-lab and on-site via 24/7 mobile workshop. The company manages over 387 MWp across Italy with a 27-workstation Control Room overseeing more than 2 GW.

Differentiator

Problem solved

Functional benefit

Products and services

• Operations & Maintenance (O&M) Services Recurring managed-service O&M contracts for utility-scale photovoltaic plants covering 24/7 monitoring via the proprietary Control Room, preventive and corrective maintenance, surveillance, mechanical solar panel cleaning, and vegetation management. Targeted at investment funds, multi-utilities, and large solar asset owners across Italy.
• EPC (Engineering, Procurement & Construction) Turnkey EPC contracting for utility-scale photovoltaic plants, covering the full project lifecycle from design and procurement through construction, grid connection, commissioning, and post-sale support. Targeted at solar developers, investment groups, and multi-utilities.
• Revamping Modernization and upgrade of aging photovoltaic plants through partial or full component replacement (modules, inverters), redesign of underperforming areas, and digitization of assets, with ROI typically achieved in 2-3 years. Targeted at owners of aging or underperforming installations.
• Repowering Energy enhancement of existing photovoltaic plants through partial or total upgrade of modules, inverters, and electrical connections to increase nominal power and annual production without occupying additional land. Targeted at owners seeking to expand output from existing sites.
• Engineering Services Integrated engineering services covering low/medium/high voltage engineering, reverse engineering, CC optimization, structural design, monitoring system design, civil works, BOS auxiliary engineering, and procurement consulting. Includes specialized on-site testing and certification services.
• Component-Level Repair Services (Chasing the SUN Electronics) Component-level repair and regeneration services for string and centralized photovoltaic inverters (including Sungrow as an official partner), UPS systems, electronic boards (Main Boards, Control Units, logic devices), and electromechanical equipment. Delivered both in-laboratory and on-site via 24/7 mobile workshop. Available across all brands and supports a circular-economy model by avoiding full replacement.

Quantifiable outcome

• CO2 savings of 139,488+ tonnes
• +4 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature5 records

Partnerships

One partnership is on record.

• SungrowcoreTechnology or IntegrationOfficial partner of Sungrow, one of the world's leading inverter manufacturers. Tresun holds training certificates issued by Sungrow for first, second, and third-level inverter interventions, enabling certified repair and maintenance of Sungrow equipment.

Scale indicators10 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Sonnedix: Global independent power producer focused on solar PV ownership and asset management across Europe and the Americas. Comparable to TRESUN's institutional customer segment (investment funds) and recurring O&M/asset management service profile, but at global scale.
• Enel Green Power: Italy-based global renewable utility operating one of the world's largest PV portfolios and providing O&M, EPC and asset management across multiple technologies. A broad incumbent in the same market as TRESUN but at materially larger scale and geographic breadth.
• EDF Renewables: Broad renewable energy operator with significant European PV operations, O&M and EPC services. Comparable to TRESUN as a multi-technology incumbent operating at scale in Italian and European PV markets.
• BayWa r.e. German-headquartered global developer and service provider offering PV O&M, EPC and asset management across Europe. Comparable to TRESUN on the integrated services model and institutional customer base, though with broader geographic and technology scope.

Direct peers

• Solarig: Spanish-headquartered PV services company covering O&M, EPC and asset management for utility-scale solar. Closely comparable on the integrated O&M + EPC + asset-management model and on serving institutional investors and developers across Southern Europe.
• Greener: Italian PV O&M and maintenance company active on utility-scale and distributed solar assets. Directly comparable to TRESUN on geographic focus (Italy), service profile (O&M for institutional clients) and the recurring managed-services business model.
• Stern Energy: Italian specialist in O&M and revamping for utility-scale photovoltaic plants. Directly comparable to TRESUN on target market (Italian utility-scale PV), service mix (O&M + revamping/repowering) and customer base (institutional asset owners and investment funds).
• Renergetica: Italian PV developer, consultancy and asset manager (Euronext Growth Milan-listed). Comparable to TRESUN on Italian utility-scale PV focus, EPC project development and the offering of operational/asset management services to institutional clients.

Others

• Sungrow: Global inverter manufacturer and TRESUN's official partner for first, second and third-level inverter maintenance. Not a direct competitor but an enabling ecosystem participant whose commercial and technical support underpins TRESUN's component-level inverter repair business.

Regional players

• Akuo Energy: French independent renewable energy developer and asset manager with utility-scale PV operations. Operates an integrated developer + O&M model similar to TRESUN but focused primarily on France and overseas territories, making it a regional rather than direct Italian competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/tresunimpiantifotovoltaici
• LinkedInlinkedin.com/company/tresun-srl-chasing-the-sun

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about TRESUN