Final answer:
Wind turbines, hydroelectric, and geothermal plants are renewable energy sources producing electricity with limitations such as intermittency, geographical dependence, and challenges in replacing all energy demand sectors.
Step-by-step explanation:
Wind turbines, hydroelectric power stations, and geothermal power plants are all innovative means of generating electricity without burning fossil fuels. These technologies harness natural forces—kinetic energy from the wind, gravitational potential energy from the flow of water, and thermal energy from the Earth's core—to drive turbines and generators that produce electricity. While they represent a significant step toward sustainable energy, it is important to recognize their limitations. Wind and hydroelectric power are subject to the intermittent nature of their energy sources and geographical constraints, while geothermal energy is largely dependent on location-specific geological conditions. Additionally, transforming such renewable energy sources to meet all aspects of our energy demand, particularly in sectors like transportation and industrial processes which are not primarily electricity-based, presents further challenges.