The project foresees the implementation of two interrelated energy-efficient assets aimed at enhancing the resilience and competitiveness of STS Invest Holding AD. The first asset is a local energy storage facility combined with a 30 kW hybrid solar inverter and industrial batteries, managed by an intelligent Battery Management System (BMS). The system will serve the company’s two main server rooms, replacing outdated UPS devices, ensuring uninterrupted power supply, and reducing energy losses. The expected effect is at least a 20% improvement in energy efficiency and annual savings of approximately BGN 5,000, accompanied by a reduction of about 2–3 tons of CO₂ eq./year. The second asset is the construction of a 15 kW photovoltaic power plant (PVPP), to be installed on the rooftop of the building hosting the company’s third additional server room for backup/disaster recovery. It will generate green energy for the self-consumption of the server facilities, with an expected annual output of more than 19,000 kWh. This will reduce electricity costs, increase the share of renewable sources used, and cut around 8–9 tons of CO₂ eq./year. Combined, the two systems will provide intelligent energy management – the batteries will be charged both from the power grid during off-peak tariff periods and from the solar energy generated on site, while discharging during peak demand. This integrated approach will result in significant cost savings, greater energy independence, and higher resilience of the company’s critical IT infrastructure. The combined impact of both assets is expected to save over 11 tons of CO₂ eq./year and approximately 19,000 kWh of energy annually, plus saving of about 10 000 BGN per year in electricity costs.
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