Final answer:
Petroleum is generally more expensive compared to other power sources, while natural gas, hydropower, and coal are considered less expensive.
Step-by-step explanation:
Petroleum
Petroleum is the source of power that is generally more expensive compared to other power sources. It requires complex extraction methods and refining processes, leading to higher costs. Additionally, the fluctuating global oil prices affect the cost of petroleum-based energy.
Natural gas
Natural gas tends to be less expensive than petroleum as a power source. It is abundant and easier to extract and transport. The availability of natural gas also contributes to its lower cost compared to petroleum.
Hydropower
Hydropower is generally considered to be less expensive than the other power sources mentioned. Once the infrastructure is established, the cost of generating electricity from hydropower is relatively stable. However, the initial costs of building dams and hydroelectric power plants can be significant.
Coal
Coal is also known for being less expensive than petroleum as a power source. It is abundantly available in many regions, making it a cost-effective option for generating electricity. However, coal can have negative environmental impacts and relatively high carbon emissions.
Learn more about Cost comparison of different power sources