SPKLU On-Grid Rooftop Solar Power Plant solar power plant PLTS Energi Surya UMKM Bandeng Presto Mangungharjo Energi Terbarukan Politeknik Negeri Semarang Polines Efisiensi Energi Pengurangan Biaya Peningkatan Produktivitas Produk Hijau Keberlanjutan Pemberdayaan Masyarakat Lokal Indonesia Kuliner Semarang Ikon Kuliner Industri Rumahan Biaya Listrik Inovasi Pengabdian Masyarakat PLTS Atap Transfer Pengetahuan Dampak Lingkungan Solar Energy SMEs Solar Power Plant Renewable Energy Semarang State Polytechnic Energy Efficiency Cost Reduction Increased Productivity Green Product Sustainability Local Empowerment Semarang Culinary Culinary Icon Home Industry Electricity Costs Innovation Community Service Rooftop Solar Knowledge Transfer Environmental Impact