Energy has important meaning in social and economics achievement to continously development and support to national economics activities. Energy consumption in Indonesia increases rapidly parallel with economics engagement and people growth. To supply energy requirement, renewable energy source should be developed. Renewable energy potency like solar energy hasn't been used for big scale although Indonesia has big energy potency.Indonesia be included on tropical area which is exposed sun radiance almost year. It means solar energy has good prospects to be developed in Indonesia. Solar energy is one kind of energy which is gotten by converting sun calor energy to another type of energy. Solar energy can be used in form solar cell for electrical power plant. The utilization of solar cell can help people who lives on isolated area which is far from electrical network to use electrical energy.Keyword : Solar cell, energy consumption, power plant ENERGI SURYAEnergi surya adalah energi yang didapat dengan mengubah energi panas surya (matahari) melalui peralatan tertentu menjadi sumber daya dalam bentuk lain. Energi surya menjadi salah satu sumber pembangkit daya selain air, uap,angin, biogas, batu bara, dan minyak bumi.Teknik pemanfaatan energi surya mulai muncul pada tahun 1839, ditemukan oleh A.C. Becquerel. Ia menggunakan kristal silikon untuk mengkonversi radiasi matahari, namun sampai tahun 1955 metode itu belum banyak dikembangkan. Selama kurun waktu lebih dari satu abad itu, sumber energi yang banyak digunakan adalah minyak bumi dan batu bara.Upaya pengembangan kembali cara memanfaatkan energi surya baru muncul lagi pada tahun 1958. Sel silikon yang dipergunakan untuk mengubah energi surya menjadi sumber daya mulai diperhitungkan sebagai metode baru, karena dapat digunakan sebagai sumber daya bagi satelit angkasa luar.Energi surya telah banyak diterapkan dalam kehidupan sehari-hari. Beberapa aplikasi energi surya adalah:1. Pencahayaan bertenaga surya, 2. Pemanasan bertenaga surya, untuk memanaskan air, memanaskan dan mendinginkan ruangan, 3. Desalinisasi dan desinfektifikasi, 4. Untuk memasak, dengan menggunakan kompor tenaga surya.Energi surya merupakan salah satu energi yang sedang giat dikembangkan saat ini oleh Pemerintah Indonesia karena sebagai negara tropis, Indonesia memiliki potensi energi surya yang besar.

The coal combustion processes which require high temperature will produce waste heat energy. The energy   can be used as generator propulsion to produce electrical energy.  Thus, Semen Padang Corporation has successfully got  funding from the Japan government, New Energy Technology Development Organization (NEDO) to build the installation Waste Heat Recovery Power Generation (WHRPG) located in the production area of Semen Padang Corporation, Indarung V. Furthermore, heat energy process can not be operated manually, so control system is needed to control this WHPRG performance. The operational of WHPRG can produce electricity power 196.15 MW  as to reduce the electric power that must be supplied by Indonesian Electricity Corporation. Besides that, the outcome of Semen Padang Corporation can be saved 33 billion Rupiah per year and CO2 emission can be declined 33,000 tons per year. 

This paper explains the research results of leakage current, hydrophobicity and flashover voltage comparison on ceramics and epoxy resin 20 kV outdoor insulator in a chamber at tropical climate conditions. The waveform of leakage current (LC) was measured using a digital oscilloscope. The digital data was transferred to a personal computer using a RS-232 cable. The digital data was analyzed using Fast Fourier Transform. The result showed that LC was affected by various environment conditions like temperature, humidity and pollution. LC of ceramics insulator was higher than epoxy resin insulator in low temperature, high humidity and high pollution condition.

Two parallel converters DC/AC with isolated control can be applied by a high frequency transformer with a switching pattern. However, the switching pattern and control technique of the converter needs more research so the process of electrical energy distribution on the parallel output side can produce the optimum value. Furthermore, in this research, parallelization method is applied by utilizing two converters in high frequency transformer with multi input-single output capability controlled by Matlab/Simulink. The input side of transformer consists of two full bridge converters while secondary side represents the parallelization of output side. Two converters DC/AC is simulated by phase shifted full bridge (PSFB) of switching pattern and voltage mode control (VMC) technique. The distribution condition of optimum energy is investigated by observation of influences of ON condition duration of each switching period cycle on input converter to ON condition duration of secondary transformer terminal. The ON condition duration of each converter with switching PSFB is the condition depends on shifted/delay phase of signal on gate control. According to this simulation, optimum ON condition occurs when shifted/delay phase of each gate control signal converter is 135° (α1=α2=135°) and this condition is more efficient than phase of gate control signal is 45° (α1=α2=45°). The simulation results show that larger α of converters give the optimum distribution.