3. The three sources of energy ENERGY SOURCE HOW DOES IT WORK?ADVANTAGESDISAVANTAGESPOWER GENERATED HYDRO- ENERGY It works because of the water which spins some rotors from a turbine. 1. continuous 2. clean 3. produces enough energy for a village 1.can not be built so far from the consumers 2. needs to be on rivers 3.the costs are high 6169MW were produced in1995 by big and small hydro- plants BIOMASS Two pipes are placed in the ground: one with cold water and the other is with hot water. By uniting these pipes is produced steam and the steam is running the turbine, and producing energy. 1. clean 2. cheap to build 1. it can not be built everywhere because the rocks must be heating rocks 1MW were produced in1995 Burning of residues It’s almost like the thermal plants but instead of burning oil or coal residues are burnt 1. economic 2. it can be made anywhere 1. it’s a practically new source of energy so that not anybody can build it 445MW were produced in1995

4. The Council of Cluj-Napoca Dear Sirs, After considering the types of alternative energy available, environmentally friendly, suitable for our area and safe, I thought that it would be wise to produce energy from the renewable sources because these are not polluting sources. I think that you can solve our energy problem if you will work after the following plan: First of all you have to build a hydro-plant on river Somes You have to build a burning residues centre You have to build solar panels on the roofs of the blocks You have to build two wind plants and wind mills near the mountains And last but not the least, you have to examine the soil to see if there are sectors with heating rocks to build biomass plants Sincerely yours, Balea Dragos