Powering Tomorrow Together

Expert care for solar parks across Europe.

Pure O&M

Independent O&M
For Solar Assets That Perform

We are not an EPC extension.
We are a dedicated Operations & Maintenance partner focused on transparency, availability, and long‑term yield.

WHY HELIOSTOIK

Fast response, backed by our own software

Over 90% of resolution reports delivered the same day, enabled by our internally developed Field Service Software, connecting technicians, engineers, and asset managers in real time.

Active Sungrow Service Partner (NL, DE, HU)

As an Active Sungrow Service Partner in The Netherlands, Germany, and Hungary, Heliostoik delivers OEM‑aligned maintenance, accelerated warranty approvals, and fast spare‑parts availability—resulting in shorter resolution times and improved operational continuity.

In‑house Monitoring Team & Platform

Our internally developed Monitoring Platform provides: Smart alarms Rapid issue classification Direct escalation to field teams This reduces reaction time and boosts yield by up to 3%.

Technical leadership, not sales management

Heliostoik is led by technically proficient professionals who understand plant behavior, not just contract clauses.

In‑house vegetation & cleaning capabilities

We operate our own equipment and trained teams for: Vegetation management Module cleaning

Transparency built into every report

All preventive and corrective activities are documented with: Clear technical descriptions Photo evidence Time‑stamped field reports All generated through our Field Service Software.

With a mission

Our Values

Transparency

Clear reporting, real data, and open communication—especially when issues occur.

Responsibility

We take ownership of performance, safety, and long‑term asset health.

Technical integrity

Decisions driven by engineering insight, not contractual shortcuts.

Long‑term mindset

We optimize for asset lifetime and yield—not short‑term KPIs.

Our Blog

Revamping Our Online Presence: The Heliostoik Group Website

Revamping Our Online Presence: The Heliostoik Group Website

Welcome to Heliostoik GroupThe Heliostoik Group is an esteemed international company specializing in the operations and maintenance of solar photovoltaic parks throughout Europe, with a strong presence in the Netherlands,…
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Strengthening Grid Safety and Compliance – Our New High Voltage Certifications in NL & DE

Strengthening Grid Safety and Compliance – Our New High Voltage Certifications in NL & DE

As the energy transition accelerates across Europe, the safe operation of high‑voltage (HV) electrical infrastructure becomes more critical than ever. Ensuring compliance, minimizing operational risks, and safeguarding personnel and assets…
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Heliostoik extends O&M service contracts for solar parks in Enschede and Voorst

Heliostoik extends O&M service contracts for solar parks in Enschede and Voorst

We are excited to share some great news: after three successful years of operating and maintaining the solar parks in Enschede and Voorst, Heliostoik has extended its O&M service contract directly…
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New Partnership and projects Announcement!

New Partnership and projects Announcement!

We’re excited to share that Heliostoik has officially signed an Operations & Maintenance agreement with EDPR for the Doetinchem and Lochem 3 PV plants in the Netherlands! 🇳🇱🌱 Our team has already kicked off full-scope O&M services, providing fast,…
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Sunny Days Are for Power—and Precision: Why IV Curve Testing Matters

Sunny Days Are for Power—and Precision: Why IV Curve Testing Matters

As the sun shines brighter, solar modules are operating at full capacity—and there’s no better time to assess their true performance. At Heliostoik, we leverage the clear skies for IV Curve measurements,…
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Heliostoik Expands into Romania with a Veteran Local Team

Heliostoik, a specialist in solar operations and maintenance (O&M), is proud to announce its official entry into the Romanian market. As the region experiences rapid growth in renewable energy investments,…
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Night Repairs, Maximum Results – The Heliostoik Way

Night Repairs, Maximum Results – The Heliostoik Way

While most of the world sleeps, Heliostoik Group is hard at work ensuring solar systems run at their best. 🌞➡️🌙 Over the course of several nights, our dedicated maintenance team carried out…
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Preventive Maintenance in Solar Parks: Why It Matters More Than You Think

Preventive Maintenance in Solar Parks: Why It Matters More Than You Think

Preventive Maintenance isn’t just a box to tick—it’s a strategy that saves real kWh and prevents costly surprises. Every time we carry out preventive maintenance, we always find something that could have become a problem:…
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Hot Commissioning Doetinchem finished!

Hot Commissioning Doetinchem finished!

Our Team has successfully performed the Hot Commissioning of the PV plant Doetinchem. All the Transformer Stations, inverters and strings have been energized and measured for optimal performance and safe…
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Our Grass Cutting Service: Enhancing Solar Efficiency, Naturally

Our Grass Cutting Service: Enhancing Solar Efficiency, Naturally

At Heliostoik Group, we are excited to announce an important upgrade to our Solar O&M offering in Hungary: professional grass cutting services. As solar parks continue to expand across the…
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Exciting News – Partnership with Sungrow!

Exciting News – Partnership with Sungrow!

We are thrilled to announce that we have officially signed Service Partner Agreements with Sungrow Europe to provide services in the Netherlands, Germany, and Hungary! This strategic partnership marks a…
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Our Team in Hungary is Growing and getting More Specialized

Our Team in Hungary is Growing and getting More Specialized

We are very proud to announce that another 2 of our technicians have successfully completed a High Voltage Switching course and Exam with practical training completed at a live substation…
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Repairs at full power

Repairs at full power

The Heliostoik Team in the Netherlands has been very busy for the last year and a half by taken care of a broader aspect of Maintenance: Big repairs Due to…
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We had a busy 2023 year

We had a busy 2023 year

Dear wandering reader,  Did not hear or see anything from us? No worries, we are still alive! In fact, we are more alive than ever. The main reason that we…
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