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A G99 compliance study is a critical analysis performed to ensure the safe and reliable integration of renewable energy systems, such as wind and solar, with the electrical grid. The study evaluates whether renewable energy installations adhere to the requirements set out in Engineering Recommendation G99 (ER G99), which is issued by the Energy Networks Association (ENA) in the UK. The primary goal of the G99 compliance study is to verify that renewable energy systems meet the technical standards and grid code requirements for secure connection to the electrical network.