Abstrak—Diversification is an effort to diversify various energy sources through reducing the use of fossil energy sources and substituting them with other energy sources including RE in order to optimize energy supply. Meanwhile, energy conservation is a systematic, planned and integrated effort to conserve existing energy resources and increase the efficiency of their use. Energy has a very significant role in human life in all sectors. Where energy demand in the commercial sector such as offices and services is still largely dominated by electricity around 60% -70%. Where the management is still largely managed by the State Electricity Company (PLN). The electricity consumption of the ITS Surabaya campus in 2019 around 9,586,857.72 kWh / year is still supported by PLN with a total expenditure of more than 9 billion. Considering the Indonesian government's program on the Target of Diversification of RUEN at least 23% in 2025 and 31% in 2050 and one of the 2030 Agenda for Sustainable Development Goals (SDGs) globally namely clean and affordable energy, the ITS Surabaya management effort is to achieve diversification of energy sources 50% renewable as stated in the 2015-2020 RENSTRA Target. The effort to diversify this renewable energy is by building a 16 KWP On Grid Solar Power Plant in the Research Center Building, which has produced around 26,290.92 kWh / year during the 2019 period. Kata Kunci—Dynamic System, Diversification RE, Electricity Needs and Fullfillment, Solar Power Plants, Payback Period, Sustainable Energy. I. INTRODUCTION USTAINABLE energy management is an important part of the overall campus sustainable management consideration. A university as an educational institution and producer of intellectual human resources, is expected to be able to create and encourage the development of innovation projects that support the independence of institutions through a combination of institutional resources and appropriate technology in them. The reduced production of fossil energy, especially petroleum, encourages the Government of Indonesia to make energy efficiency and diversification by increasing the role of New and Renewable Energy (RE) in maintaining national energy security and independence as stipulated in Government Regulation No. 79 of 2014 concerning National Energy Policy (KEN) in stipulate a progressive increase in the Renewable Energy Mix, with the target of the National Energy General Plan (RUEN) in the primary energy mix reaching at least 23% in 2025 and at least 31% in 2050 [1-5]. With the projected supply of RE in the energy mix that produces electricity or direct use in 2025 and 2050 can be seen in Figure 1. Electricity is a necessity and livelihood of many people, is one of the products of fossil energy that is increasingly rare and expensive. Based on 2018 data from the Ministry of Energy and Mineral Resources (KESDM) of Indonesia, the demand for energy in the commercial sector such as offices and services is still largely dominated by electricity, which is around 60% -70%. Where the increase in electricity demand in the commercial sector is predicted to increase about 7 times by 2050, with an average growth rate of electricity demand around 6% - 7% per year during the 2018-2050 period [3]. Indonesia as an archipelago that is crossed by the equator has abundant natural resources that can be utilized maximally as the best alternative energy source, namely the utilization of solar energy as a new and renewable energy source (EBT). Solar energy sources are scattered throughout the territory of Indonesia, so that the potential for PLTS to be developed or utilized by installing solar rooftop panels. According to Solarex (1996), Indonesia as a tropical country has high solar energy potential with an average irradiation of 4.5 kWh/m2/day - 5.0 kWh/m2/day, which means that for 1 Kw photovoltaic (PV) or 1 kWp solar panels have potential to produce 3.4 kWh to 5 kWh of electrical energy in one day [6- 8]. The level of irradiation and the potential of solar energy in territory of Indonesia be explained in Figure 2 and Figure 3. ITS Surabaya Campus is one of the largest campuses in the East Java region which has an area of around 180 hectares with a total building area of around 150,000 m2 [9]. ITS Surabaya has 10 faculties with 38 departments and is Dynamic System Modeling of Renewable Energy Diversification at ITS Surabaya as a Sustainable University Management Effort Ayasophia Arishinta, and Erma Suryani Department of Information System, Institut Teknologi Sepuluh Nopember, Surabaya e-mail: ayasophis.edu@gmail.com S Figure 1. Primary Energy Supply - EBT in 2025 and 2050.