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Pareto signs SundayOS agreement for solar portfolio

From left: Christian Gjæver Rendall (Pareto Alternative Investments), Fredrik Rudfoss Haugland (Pareto Alternative Investments), Alexander Rydfjord (Sunday Power), Hanna Backer Malm (Sunday Power) and Håkon Trømborg (Sunday Power) at Norway’s largest rooftop solar installation at Ahlsell’s logistics center in Eidsvoll. The solar installation will be operated through SundayOS.
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From left: Christian Gjæver Rendall (Pareto Alternative Investments), Fredrik Rudfoss Haugland (Pareto Alternative Investments), Alexander Rydfjord (Sunday Power), Hanna Backer Malm (Sunday Power) and Håkon Trømborg (Sunday Power) at Norway’s largest rooftop solar installation at Ahlsell’s logistics center in Eidsvoll. The solar installation will be operated through SundayOS.

Pareto signs SundayOS agreement for solar portfolio

Pareto Alternative Investments has selected SundayOS as the operating platform for three solar funds with a combined capacity of 65 MWp. With the agreement, more than one third of all commercial rooftop solar capacity in Norway now runs on the SundayOS platform.

Published
12.05.2026
May 15, 2026

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With the Pareto agreement, Sunday Power takes a new step as a supplier to the solar energy industry. The company will continue to develop and own solar installations through its Solar as a Service model, while now opening SundayOS to professional owners and operators of solar energy portfolios.

– With this agreement, more than one third of all commercial rooftop solar capacity in Norway is now running on SundayOS. We are currently growing at a pace that indicates we could pass 50 percent before the end of the year. That is motivating, and a clear confirmation that we have built a product the market wants, says Håkon Trømborg, CTO at Sunday Power.

Bringing operations, billing and reporting together

SundayOS is developed to give owners, operators and asset managers of solar installations better control over production, deviations and financial performance.

The solar industry has long relied on different systems for different parts of operations. SundayOS is the first platform in the market that combines technical monitoring, deviation detection, billing and financial reporting in one solution. The platform uses digital twins and weather data to calculate expected production, detect anomalies and connect production data directly to billing and financial reporting.

– As solar becomes a larger part of the energy mix, it is no longer enough to know that a system is producing power. You need to know what it should be producing, where deviations occur, how they impact financial performance and what actions need to be taken. That is the complete picture SundayOS is built for, says Alexander Rydfjord, CPO at Sunday Power.

He believes the need for better software will grow as the solar industry matures.

– Solar energy is no longer just about building as many installations as possible. Owners and operators of portfolios need to run them efficiently, respond quickly to deviations and report accurately. That requires systems that work together, says Rydfjord.

Pareto gains better oversight across funds and assets

For Pareto Alternative Investments, it has been important to implement a platform that can manage both technical and financial oversight across a growing solar portfolio.

– For us, it has been important to maintain a professional and scalable platform for managing our solar portfolio. As the portfolio grows, we depend on strong systems for technical monitoring, deviation detection, billing and financial reporting across both assets and funds. SundayOS provides us with a more integrated and holistic solution for this, says Christian Gjæver Rendall, Technical & Investment Manager Energy at Pareto Alternative Investments.

Built from operational experience

Sunday Power developed SundayOS based on its own experience as a developer and operator of solar installations on commercial real estate. The platform is designed to solve practical challenges the company itself has faced in operations, monitoring and reporting.

– We did not build SundayOS from a desk. The platform was developed because we needed better tools ourselves to monitor solar installations accurately and efficiently. We are now seeing that the same need exists among other professional owners and operators, says Trømborg.

He emphasizes that the software initiative is a natural extension of Sunday Power’s core business.

– This is not a side project. It is a natural extension of what we already do. We will continue developing solar installations, but we will also provide the infrastructure needed to operate large solar portfolios more effectively, says Trømborg.

About Sunday Power

Sunday Power makes it easy for commercial real estate owners to adopt solar energy. The company develops, finances, builds and operates solar installations through a Solar as a Service model, enabling building owners to access locally produced renewable energy without major upfront investments. Sunday Power has also developed SundayOS, a software platform for operations, monitoring, billing and financial reporting of solar portfolios.

About Pareto Alternative Investments

Pareto Alternative Investments AS (PAI) is a Nordic alternative investment manager with approximately NOK 27 billion under management on behalf of institutional investors across real estate, renewable energy and credit. Within renewable energy, PAI is among the largest Nordic players in distributed commercial and industrial solar (C&I), with approximately 90 MWp of solar and 20 MW of BESS under development and management through vehicles including Pareto Solar Fund.

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