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Repowering Solar Plants

Together we will make your PV plant fit for the future and create new financial opportunities.

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Our structured PV repowering process ensures the long-term profitability of your plant

As an independent PV specialist, greentech is your reliable partner when it comes to identifying, assessing and implementing plant optimizations. We follow a structured repowering process, from the very first analysis all the way to detailed planning and control of the investment.
We are supported by our self-developed repowering tool, which generates calculations that provide a reliable basis for investment decisions. We guarantee professional technical implementation and provide an experienced team of engineers who use tried and tested quality management processes.

Repowering by greentech is a profitable investment that extends the life of your plant and actualizes your components, making your plant as efficient as possible.

Repowering inspection of a solar plant with pv modules on a field

There are lots of great reasons to implement repower measures

There are many factors that make repowering a PV plant economically viable.

Achieving improved efficiency

The efficiency of new modules and inverters have significantly increased in recent years, while costs have fallen sharply

Avoiding planning errors

Changes in external factors or errors in the original planning can result in lower yields from the solar power system

Preventing availability losses

Defective components or poor performance on the part of the manufacturer lead to yield losses due to frequent downtime

Minimizing power losses

Degradation of components reduces the performance of the system, and therefore impacts the return on your investment

Our promise for your solar repowering plant

Repowering offers financial potential

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It is better to be preventive than reactive. Here’s why.

You can increase your plant efficiency by 4-6%
Worthwhile after 5-10 yrs of operation
New warranties for new components
Lower costs and less frequent recurrence of repairs
Prepare plants for continued operation after the funding period
Comply with regulatory requirements for continued operation
Helps to extend maintenance intervals
Avoid downtimes and shutdowns


Talk to our specialists at greentech about
your repowering needs.


Financial audit

Supported by our self-developed repowering tool, which provides a reliable basis for the investment decision, we will perform a detailed technical, legal and commercial analysis, to ensure that your PV repowering project is financially viable.

Technical Inspections

We assess and identify the potential of a PV repowering project by means of a technical evaluation and analysis of performance improvement, and coordinate with the grid operator to ensure strict regulatory compliance.

Holistic service: one point of contact, from the planning to the completion of the construction phase

greentech takes over the complete repowering process from planning to implementation: This is ensured on the one hand by an experienced team of engineers, and on the other hand by tried and tested quality management processes. You don’t have to worry about anything and have a personal contact person in case of questions.

Our greentech Repowering tool

Degrading modules, outdated inverters, and planning errors – it is well known that repowering measures during the operating phase might be a worthwhile investment. Doing so, owners of PV power plants get the chance to increase their profits by specific optimization measures. To provide a reliable and honest base for decision making, greentech developed a specialized Repowering tool. It helps providing a reliable profit analysis and assessment about the commercial characteristics of re-investments – before the planning phase has even started. Besides the technical design and implementation, greentech is now able to provide reliable profitability perspectives to the investor.
Repowering solar plant monitored by greentech engineer with greentech repowering tool

Discover our full range of services for your repowering process

Performance and potential analysis

Independent analysis of the actual performance of the plant
Identification of optimization potentials and the profitability thereof
Identification of risks
A comprehensive report and presentation of results

Technical concept

Technical, legal and commercial analysis
Detailed planning of the repowering project
  • Electrical planning, DC and AC
  • Mechanical installation planning
  • If required: Planning of plant communication
Preparation of plans and drawings, e.g. single line diagrams
If required: coordination of regulatory requirements with the grid operator
Comprehensive report and presentation of results
Implementation and quality control
Execution of individual work steps and trades
Quality assurance on site
Preparation of technical documentation
Technical evaluation and analysis of performance improvement

greentech Case Study: Repowering

Replacement of central inverters by string inverters for 2.6 MWp rooftop PV system in Germany

In order to extend the lifetime of an older plant portfolio, beyond the feed-in subsidy period, the customer decided to replace the inverters of a large portion of his photovoltaic plants with new ones. The plants are predominantly rooftop systems, with outputs between 241 kWp and 4.0 MWp. In total, the program consists of 18 revamping projects within the portfolio.
Repowering of a pv power plant in order to create new financial opportunities


How much does a repowering measure cost?
This is largely dependent on the type and scope of the repowering project in question. We consider every repowering project as an individual, independent project, and provide a specific design and costing structure for it. With our experience and our network of partners, we can ensure that you will receive the best quality-price ratio on the market. Many repowering projects have a short payback period, which we will analyze beforehand and monitor after completion.
What is the timeline to get a repowering project implemented?
The design phase usually takes 2-4 weeks. The execution depends on the lead times for the components and the scope of the project. Usually, we complete a repowering project within a couple of weeks, including commissioning and detailed documentation.
When does a repowering measure pay off?
An inverter repowering, for example during the FIT compensation period, is a good opportunity to prepare the system for continued operation thereafter. In many cases, the FIT provides compensation for the costs incurred – this is especially true for older plants that have high tariffs, but only have a short remaining term under the FIT. Projects can therefore pay for themselves after just two or three years. In addition, manufacturer guarantees and warranties are renewed for the new components.
Do you have a repowering checklist for self-assessment as a first step?
Every PV plant and repowering project is unique. The most efficient option is to discuss the viability of a repowering project with our experienced engineers. Please get in touch with us to get started!
The warranty on my components has expired; does investing in repowering make sense?
Yes, for example when there are technical weaknesses that lead to a reduction in the performance of the system, or if repair costs are increasing. But even if the existing components, for example inverters, are still running without issues, a repowering measure can make sense because these components have not only become cheaper in recent years, but also more efficient and capable of generating a yield increase of between 3% and 5% with the same capacity. This may justify an investment, even if the existing components are still running without issues.
Do I need new permits if I change the system components or if my output changes?
That depends on the individual repowering project and country-specific regulations. Plants that are subject to a feed-in tariff are usually highly regulated and require a consultation with the regulatory body when exchanging or repairing the PV modules. In case of inverter repowering, it is always advisable to get in touch with the grid operator at an early stage to discuss the specific requirements. In case of a new design, it might be necessary to review the original building permit. In a greentech repowering project, all these aspects are carefully considered.

Still have questions?

Can’t find the answer you’re looking for? Please get in touch with our team of experts

Why work with greentech?

Years of experience


Professionals in our team

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About greentech

With advice and action at your side - in every phase of your project

greentech is an integrated PV specialist. The range of services includes project development, system design, construction, operation and management of PV power plants in Europe. In the area of operational management, we offer a full-service operational management concept for PV plants of all sizes with an interdisciplinary team of experienced experts, as well as services for planning, quality assurance and yield maximisation. With a comprehensive range of services and a current portfolio of more than 1 GWp in operational management, we are one of the largest independent service providers worldwide. As an integrated PV specialist, greentech also covers the areas of project development and plant construction.

Your greentech specialists for
professional area analysis

Johannes Liebich

Head of Engineering & Technical Advisory

Johannes Liebich is head of the “Engineering & Technical Advisory” team at greentech. He is responsible for the planning and implementation of projects and for the development of new services in technical plant consulting. Johannes Liebich studied Environmental Engineering with a focus on photovoltaics and has been working in the solar industry since 2011. As an experienced Technical Advisor, his main focus is on plant construction and operation.
Steffen Heberlein

Senior Project Manager Sales & Business Development

Steffen Heberlein is responsible for the expansion of the business units Technical Operations Management, Commercial Operations Management and Technical Advisory. His activities for greentech’s customers range from price indications to contract negotiations and project implementation support. As a key account manager, he also looks after more than 250MWp for various customers in greentech’s existing portfolio.

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