Kebutuhan energi terbarukan di Indonesia sangatlah penting, saat ini sumber energi terbarukan porsinya relatif kecil. BPPT ( Badan Pengkajian dan Penerapan Teknologi) dalam kegiatannya melakukan pembangunan pilot plant Biogas Pome setara 700 kW berkerjasama dengan PTPN V (PT. Perkebunan Nusantara V) dengan sistim tangki berpengaduk secara kontinu yang mana hasil gas tersebut dimanfaatkan sebagai bahan bakar boiler pabrik PMKS di sei pagar. Metode pemilihan pondasi tangki reaktor dengan kapasitas 2000m3, kami melakukan perbandingan perhitungan antara menggunakan free head atau fix head dengan memakai diameter 50cm dan 60cm dengan melihat banyaknya jumlah, diameter pile dan ketebalan mat yang digunakan. Diameter rencana tangki reactor direncanakan berukuran 16.8m dengan ketinggian 9m, dengan beban tangki sekitar 2174.2ton dan berdasarkan data dari soil test didapat nilai N-SPT di kedalaman 10-15m, untuk itu kami merumuskan bahwa fundasi pile yang kita pilih. Perbandingan fix and free head pada pile ukuran 50cm dimana perbedaan fix and free head 44 berbanding 65, dengan ketebalan mat foundation 1.1m berbanding 0.6m sedangkan dengan mengunakan diameter 60cm jumlah pile 32 berbanding 50 dengan ketebalan mat 1.3m berbanding 0.6m. Dari analisa tersebut dengan memperhatikan kekuatan dan keekonomisan maka dipilih pile dengan diameter 50cm dengan mengunakan free head.

Renewable energy development for power generation is in line with the government's program toincrease the share of renewable energy in the national energy mix which is relatively small at themoment. BPPT, collaborating with PTPN 5 in the Insinas Flagship program, built a pilot plant for biogasproduction from Palm Oil Mill Effluent (POME) with a capacity of 700 kW. The reactor used in this pilotproject is a Continuous Stirred Tank Reactor (CSTR) which is the most important operating unit forproducing biogas from POME. Therefore, the selection of the CSTR foundation is crucial since themain process occurs in the reactor. The scope of this activity is to realize the final design into theconstruction of a CSTR pilot plant. Several types of foundations were studied, starting from shallowfoundation type such as tread foundation, deep foundation, until combining shallow foundation typewith deep foundation type. The evaluation of existing data and design review indicates that the use ofMat Foundation is not suitable due to soil condition at a depth of 0–5m which is in the form of sandyloam soil with an NSPT value of less than 20. The selection of Piles is based on the calculations usingtotal vertical load of 3035,37 ton and total horizontal load of 542,57 tons. Considering the availability ofmaterials and time concern, the recommended foundation type is pile with a diameter of 600 mm typeB and a length of 12 m.