Adanya ajang internasional di Lombok berdampak terhadap kenaikan kebutuhan bebanlistrik, sehingga diperlukan optimalisasi kinerja generator unit 5 PLTD Ampenan. PadaPLTD Ampenan, terdiri dari 8 unit, dan hanya unit 5 yang dapat dioptimalkan kinerjanya,mengingat ada generator yang tidak dapat bekerja (unit 1) dan yang lain tidak dapat di optimalkan. Metode yang digunakan adalah dengan mengoptimalkan kinerja generatorunit 5, selebihnya dilakukan efisiensi kinerja generator. Untuk mengetahui efisiensi generator akibat perubahan beban, dilakukan penelitian di Pembangkit Listrik TenagaDiesel (PLTD) PT. PLN (Persero) UPK Ampenan Lombok. Perhitungan dilakukandengan mengambil data generator unit 5 PLTD Ampenan, dengan waktu penelitianselama 1 minggu dalam 2 waktu beban puncak. Hasil analisis data, nilai pembebanangenerator berbanding terbalik dengan nilai optimalisasi generator. Ketika optimalisasigenerator berada pada saat nilai tertinggi, sebesar 93,394%, pembebanannya sebesar 2.866,470 kW dan ketika optimalisasi generator berada pada nilai terendah, sebesar 88,886% pembebanan yang ditangguh oleh generator sebesar 3.718,664 kW. Dapat bahwa fluktuasi beban berpengaruh terhadap optimalisasi kinerja generator dan berbanding terbalik, serta penurunan terendah optimalisasi akibat fluktuasi beban sebesar 4,508% untuk waktu beban puncak siang dan 2,714% untuk waktu beban puncak malam (~2-5%), masih dapat dikatakan wajar (perubahan tidak signifikan (<20%)) dan generator masih layak digunakan.

The existence of an international event in Lombok has an impact on the increase in the need for electricity loads, so it is necessary to optimize the performance of the generator unit 5 PLTD Ampenan. The Ampenan PLTD consists of 8 units, and only 5 units can be optimized for performance, considering that there are generators that cannot work (unit 1) and others cannot be optimized. The method used is to optimize the performance of the generator unit 5, the rest is done by the efficiency of the generator's performance. To determine the efficiency of the generator due to changes in load, a study was conducted at the Diesel Power Plant (PLTD) PT. PLN (Persero) UPK Ampenan Lombok. The calculation is done by taking data from the generator unit 5 PLTD Ampenan, with a research time of 1 week in 2 peak load times. The results of data analysis, the generator loading value is inversely proportional to the generator optimization value. When the generator optimization is at the highest value, amounting to 93.394%, the load is 2.866,470 kW and when the generator optimization is at the lowest value, at 88.886% the load suspended by the generator is 3,718.664 kW. It can be concluded that load fluctuations affect the optimization of generator performance and are inversely proportional, and the lowest decrease in optimization due to load fluctuations of 4.508% for peak load times during the day and 2.714% for peak load times at night (~2-5%), can still be said to be reasonable (changes are not significant (<20%)) and the generator is still feasible to use.