500 kW Solar Utility Rooftop Project, Sweden

Against the backdrop of accelerated global energy transition, commercial and industrial distributed photovoltaic projects have become an important way for enterprises to achieve sustainable development. PWSOLAR, as a leading global provider of photovoltaic solutions, successfully implemented a 500 kW solar utility rooftop commercial project in Sweden in 2023 with its outstanding technical strength and rich project experience. The project uses 550 watt high-efficiency solar panels, providing an efficient and reliable clean energy solution for the Swedish public sector, becoming a model for green energy development in the Nordic region.

Project Background and Significance

Sweden, as a pioneer in the global development of renewable energy, has set an ambitious goal for 65% of its electricity to come from renewable energy by 2030. In this context, the demand for clean energy in the public sector is increasing day by day. PWSOLAR actively responds to the call of the Swedish government by implementing a 500 kW solar utility rooftop project to provide green electricity to local public utilities, reduce operating costs, and contribute to environmental protection.

This project not only complies with Sweden's national energy policy, but also reflects PWSOLAR's commitment to global sustainable development. By fully utilizing the idle roof resources of public utility buildings, the project has achieved efficient utilization of land resources and avoided the interference of ground power station construction on the ecological environment. In addition, the project adopts an operation mode of "self use and surplus electricity connected to the grid", which maximizes energy utilization efficiency.

Project Technical Proposal

Selection of Photovoltaic Modules

This project adopts 550 watt high-efficiency solar panels, which have the following advantages:

High efficiency: The 550 watt module adopts advanced monocrystalline silicon technology, with a conversion efficiency of up to 21.5%, and can still maintain excellent performance under relatively low lighting conditions in Sweden

High reliability: The solar panels undergo strict quality control to ensure long-term stable operation under cold climate conditions in Sweden

Double sided power generation: Some solar panels adopt a double-sided design, which can utilize the reflected light from the ground to increase the overall power generation

Low attenuation rate: The attenuation rate is less than 1% in the first year, controlled within 0.45% year by year, and can still maintain over 85% of the initial power after 25 years

System Design

This project adopts a modular design concept, and the system configuration is as follows:

Photovoltaic array: Based on the characteristics of the roof structure, a fixed tilt angle installation method is adopted, and the tilt angle is optimized according to the local latitude design

Inverter: Select string inverters to ensure efficient system operation and have intelligent monitoring function

Grid connected system: equipped with smart meters to achieve bidirectional metering and support flexible operation mode of "self use and surplus electricity grid connection"

Monitoring system: equipped with a remote monitoring platform, real-time monitoring of system operation status, timely detection and resolution of problems

Project Implementation Process

Project Evaluation and Planning

Before the project was launched, the professional team of PWSOLAR conducted a comprehensive evaluation of the target building, including roof structure, orientation, and shading conditions. Based on the evaluation results, a detailed project planning scheme has been developed to ensure maximum utilization of available space while ensuring system safety and reliability.

Design and License Application

Based on the project evaluation results, PWSOLAR has designed a detailed system configuration plan and assisted the client in completing all necessary license application work. In Sweden, photovoltaic projects require multiple approvals such as building permits and grid access permits. PWSOLAR has efficiently completed all administrative processes based on its rich local experience.

Equipment procurement and transportation

PWSOLAR has established long-term partnerships with high-quality suppliers worldwide, ensuring timely supply of key equipment such as 550 watt solar panels. Considering Sweden's geographical location, the company has developed an efficient logistics plan to ensure that the equipment arrives at the project site on time.

Construction and installation

The project construction is completed by a professional team from PWSOLAR company, strictly adhering to local building codes and safety standards in Sweden. During the construction process, the team adopted a modular installation method, greatly reducing installation time while minimizing interference with the normal operation of the building.

Grid testing and acceptance

After the system installation was completed, PWSOLAR conducted comprehensive testing to ensure that all solar panels and system functions were functioning properly. Subsequently, we collaborated with the local power grid company to complete the grid connection test, and the system successfully passed the acceptance and was officially put into operation.

Operation and Maintenance Services

PWSOLAR provides comprehensive operation and maintenance services, including regular inspections, cleaning and maintenance, performance monitoring, etc. The company has also established a remote monitoring center to track the real-time operation status of the system and ensure its long-term stable operation.

Economic Benefit Analysis of the Project

The estimated investment cost for the Swedish side for this project is as follows

The total investment of this project is approximately 2.5 million euros, consisting of the following solar panels:

Photovoltaic modules: approximately 1.5 million euros

Inverter and electrical equipment: approximately 400000 euros

Installation project: approximately 300000 euros

Other expenses: approximately 300000 euros

Revenue Analysis

The expected annual power generation of this project is about 450000 kilowatt hours, and the revenue will be calculated according to the following two modes:

Spontaneous self use mode:

Electricity price: 0.12 euros per kilowatt hour (Swedish commercial electricity price)

Annual revenue: 450000 kWh x 0.12 euros/kWh=54000 euros

Investment payback period: approximately 4.63 years

Remaining power grid connection mode:

On grid electricity price: 0.08 euros per kilowatt hour

Annual revenue: 450000 kWh x 0.08 euros/kWh=36000 euros

Investment payback period: approximately 6.94 years

Energy saving and emission reduction benefits

This project saves about 180 tons of standard coal annually, reduces carbon dioxide emissions by about 450 tons, reduces sulfur dioxide emissions by about 13.5 tons, and reduces nitrogen oxide emissions by about 6.75 tons.

Project Advantages

Efficient and energy-saving: Using 550 watt high-efficiency solar panels, the power generation efficiency is high, and it can still maintain excellent performance under Swedish lighting conditions

Fast investment return: The investment can be recovered in 4-7 years, and the following ten years are the pure income period

Significant environmental benefits: reducing carbon emissions and improving environmental quality

Policy support: Enjoy multiple subsidies and tax incentives from the Swedish national and local governments

Enhancing corporate image: Enhancing the green image of public institutions and strengthening their sense of social responsibility

Success Cases

This project has been successfully implemented in multiple public utilities in Sweden. Here are some examples:

A municipal sewage treatment plant with an installed capacity of 300 kilowatts and an annual power generation of approximately 270000 kilowatt hours, saving approximately 32400 euros in electricity bills annually

A certain public hospital: installed capacity of 200 kilowatts, annual power generation of about 180000 kilowatt hours, annual electricity cost savings of about 21600 euros

A comprehensive building of a certain school: with an installed capacity of 150 kilowatts, the annual power generation is about 135000 kilowatt hours, and the annual electricity cost savings are about 16200 euros

Project Outlook

With the continuous advancement of photovoltaic technology and the continuous decrease in costs, distributed photovoltaic projects in the public sector will usher in broader development space. PWSOLAR will continue to optimize project design, improve system efficiency, reduce investment costs, and provide high-quality distributed photovoltaic services for more public utilities.

In the future, PWSOLAR plans to replicate and promote this successful model in Sweden and other Nordic regions, promoting more public utilities to achieve energy transformation and jointly achieve a win-win situation of economic and environmental benefits.

Conclusion

PWSOLAR's 500 kW solar utility rooftop project in Sweden uses 550 watt high-efficiency solar panels, providing an efficient and reliable clean energy solution for the Swedish public sector. The project has the advantages of fast investment return, significant environmental benefits, and policy support, and is an important way for public institutions to achieve sustainable development.

We look forward to collaborating with more public utilities to promote the development of green energy and contribute to building a clean, low-carbon, and sustainable energy future.