Energi baru terbarukan merupakan energi yang ramah lingkungan karena memanfaatkan sumber energi rendah emisi seperti matahari, air, dan bayu. energi baru terbarukan yang bersumber dari air dapat diubah menjadi energi listrik dengan menggunakan sistem pembangkit daya turbin air seperti turbin pelton. penelitian ini bertujuan untuk merancang bangun dan menguji sistem pembangkit daya listrik turbin pelton skala laboratorium. metode yang digunakan adalah metode analitis untuk merancang sistem pembangkit daya dan metode eksperimen pengujian beban untuk mengetahui efisiensi dari sistem pembangkit daya tersebut. sistem pembangkit daya turbin pelton yang telah dirancang bangun memiliki dimensi panjang rangka sekitar 1200 mm, lebar 800 mm, tinggi 900 mm, dan sudu dengan jumlah 18 buah. poros turbin berdiameter sekitar 20 mm dengan panjang sekitar 700 mm, dan ukuran runner turbin sekitar 300 mm. hasil pengujian turbin pelton dengan beban lampu 5 watt menunjukkan besar tegangan konsumsi beban sekitar 14,77 volt besar arus sekitar 0,02126 ampere. sementara putaran yang dihasilkan oleh turbin dan generator sekitar 1838,1 dan 1617,5 rpm, masing-masing. efisiensi sistem pembangkit daya turbin pelton mencapai 10,29%. kata kunci: efisiensi, rancang bangun ,pembangkit listrik ,turbin pelton

New renewable energy is environmentally friendly energy due to its reliance on low-emission energy sources, such as sun, water, and wind. new renewable energy sourced from water can be converted into electrical energy using water turbine power generation systems such as pelton turbines. the purpose of the research was to design and test a laboratory-scale pelton turbine power generation system. the research method used was an analytical method to design the power generation system and an experimental method to determine the efficiency of the power generation system. the pelton turbine power generation system has been designed with dimensions of approximately 1200 mm in length, 800 mm in width, 900 mm in height, and 18 blades. the turbine shaft, measuring approximately 20 mm in diameter and 700 mm in length, is complemented by a turbine runner measuring approximately 300 mm. the test results of the pelton turbine with a 5-watt lamp load showed that the load consumption voltage registered at approximately 14.77 volts, while the current was approximately 0.02126 amperes. the rotational speeds of the turbine and generator were found to be approximately 1838.1 and 1617.5 rpm respectively. the efficiency of the pelton turbine power generation system reached 10.29%. keywords: efficiency, design, power generation, pelton turbine