Since 2016, we have been building our Operations and Maintenance (O&M) team to operate and maintain all of our owned and operated IPP portfolios in China, Europe and the United States. We utilize customized software to monitor the performance and security of our solar power projects on a real-time basis. We maintain our solar power projects to maximize the utilization rate, rate of power generation and system life of our solar power projects.
In addition to the O&M services provided by our in-house O&M team, we also engaged third party contractors to operate and maintain substantially all of our solar power projects overseas. We are generally responsible for the maintenance of those projects and perform overall maintenance obligations. We subcontract certain specific O&M tasks such as security and repair to third party contractors who are on-call to deliver such services on demand. We generally require warranties for defects in materials or components and warranties for module capacity under normal testing conditions.