Solar power, with no initial investment
With an on-site PPA (Power Purchase Agreement), you can secure fixed, predictable electricity costs for a period of 10 to 20 years.
By directly using the solar power generated on-site, you save on grid fees, benefit from tax advantages, and permanently reduce your energy costs below the level of traditional grid power. At the same time, you make a measurable contribution to reducing CO₂ emissions and strengthen your ESG performance.
Take advantage of solar power without tying up capital, and keep your budget free for your core business.
Customized electricity supply contracts guarantee you stable long-term prices for the PV electricity you use yourself.
By using solar power directly on-site, grid fees as well as grid-related surcharges and levies are eliminated.
A full-service solution for equipment financing, installation, operation, maintenance, and insurance.
Partners who already trust us:






Funding & implementation
While our specialized PPA partners handle matters such as financing and plant operations, we are responsible for the entire project implementation. All work is carried out in accordance with the highest safety standards: A detailed preliminary assessment of the roof’s structural integrity and professional PV installation are integral parts of the project implementation.
Customized electricity supply contract
At the heart of the On-Site PPA is a customized electricity supply agreement. You purchase the solar power generated on-site directly from our partners at fixed rates. This makes your energy costs predictable in the long term and reduces your operating expenses from day one.
Operating time & plant operation
Throughout the entire term of the On-Site PPA – typically 10 to 20 years – the system remains the property of the PPA partner. You do not need to worry about the technical maintenance of the PV system during this period. We provide the infrastructure so that you can focus fully on your core business.
“Let’s find out together how we can best support you with your PV project.”
Optimizing the ESG performance
With a customized On-Site PPA, you can purchase verifiably green electricity directly from your own roof. This allows you to reduce your Scope 2 emissions, improve your carbon footprint, and maximize your ESG performance in a sustainable and efficient manner.
Contract expiration & asset transfer
You get the best of both worlds: With an On-Site PPA, you often have the option to take ownership of the fully operational solar power system at the end of the contract term. A service-based solar solution thus becomes a long-term asset – usually for a nominal residual value.
“Wir schätzen Sonnis als einen unserer Premiumpartner. In über 20 gemeinsam realisierten Projekten hat sich die Zusammenarbeit auf einem herausragenden Qualitätsniveau bewährt. Besonders überzeugt uns der direkte und enge Kontakt zum gesamten Team, der unsere Zusammenarbeit zuverlässig, effizient und angenehm gestaltet.”
“Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa”
“Ein On-Site PPA ist die effizienteste Methode für Unternehmen, die Energiewende am eigenen Standort ohne wirtschaftliches Risiko umzusetzen. Wir schaffen die Infrastruktur, damit unsere Kunden sich voll auf ihr Kerngeschäft konzentrieren können”
“Ein On-Site PPA ist die effizienteste Methode für Unternehmen, die Energiewende am eigenen Standort ohne wirtschaftliches Risiko umzusetzen. Wir schaffen die Infrastruktur, damit unsere Kunden sich voll auf ihr Kerngeschäft konzentrieren können”
An On-Site PPA (Power Purchase Agreement) is a long-term electricity supply contract between a company and a system operator. In this model, the photovoltaic system is installed directly on the company’s premises or rooftop (on-site). The company purchases the generated electricity at a pre-agreed fixed price, while the partner takes full responsibility for the investment, construction, and operation of the system.
The primary advantages are cost savings and planning security. Since the electricity is consumed directly on-site, grid fees, electricity taxes, and other levy-based components are largely eliminated. Furthermore, companies secure a fixed electricity price for 10 to 20 years, making them independent of price fluctuations in the energy market.
In the On-Site PPA model, the PPA provider (operator) generally bears all costs. This includes planning, financing, and installation, as well as ongoing maintenance, insurance, and any necessary repairs. As a result, the participating company incurs no financial risk and no personnel effort.
By using solar power generated directly on-site, so-called Scope 2 emissions (indirect emissions from purchased energy) are significantly reduced. Since it is a new installation, the project also fulfills the criterion of ‘additionality,’ which is particularly valuable for sustainability reports according to ESG criteria.
Electricity volumes that the company does not currently require are typically fed into the public grid by the plant operator or temporarily stored in optional battery storage systems for later use (e.g., at night or for peak loads). The details regarding remuneration or the utilization of surplus power are governed by the individual On-Site PPA (Power Purchase Agreement).
At the end of the contract term (usually after 10, 15, or 20 years), there are typically three options: