Group 4 (English 1) Member : Sony Priya Arviana Ghina Rivera Liza Valentina (014201900171) Pan Yacheng (014201900236) Questions: 1. Two sources of energy other than the sun. 2. Are they widely used in Indonesia? Where to use it? What is the function of alternative energy? 3. What are the pros and cons of using alternative energy sources? Answer : 1. There is water and geothermal energy. 2. Common. Mainly used in power generation. Alternative energy can reduce environmental pollution. Indonesia has a huge of geothermal potential in the world since the location of the country is in the ring of fire in volcano line. Most of the geothermal reservoirs are water-dominated. Geothermal energy is a relatively environment friendly energy source that is derived from the earth's inner heat. Water that is pumped into the earth by men or by natural causes (rain) is collected at the earth's surface in the form of steam, which can be used to drive turbines for the production of electricity. Exploration costs as well as the capital cost of the geothermal plant is higher than for plants that run on fossil fuels. However, once in use, production costs are low compared to the fossil fuel-fired plants. With about 40 percent of the world’s geothermal reserves being located below the surface of Indonesia, the country is estimated to contain the world's largest geothermal energy reserves and therefore contains huge potential for this renewable energy. However, this potential remains largely untapped. Today, Indonesia only uses four to five percent of its geothermal capacity. Alternative energy is any energy source that is an alternative to fossil fuel. These alternatives are intended to address concerns about fossil fuels, such as its high carbon dioxide emissions, an important factor in global warming. Marine energy, hydroelectric, wind, geothermal and solar power are all alternative sources of energy. 3. Water energy is a kind of renewable energy, water energy is mainly used for hydropower. Hydropower converts the potential and kinetic energy of water into electricity. A plant that generates electricity from hydropower is called a hydroelectric power plant, or hydropower plant. The advantages of hydropower are low cost, continuous regeneration and no pollution. The disadvantage is that the distribution is limited by natural conditions such as hydrology, climate and geomorphology. Easily affected by terrain, climate and other factor, the temperature and pressure of geothermal steam are not as high as that of thermal power generation, so the low utilization rate of geothermal energy can have pollution problems and may also cause earthquakes. It is worth mentioning that in clean energy, the cost of geothermal power generation is also relatively low. According to the International Geothermal Association, geothermal power generation costs only about half of the cost of wind power.
