It is necessary to strike a balance between these two opposing views. In the following sections of this guide, we will use plain, accessible language to break down hydropower’s working mechanisms, core values, existing shortcomings, and the rationale for its sustainability positioning.
What is hydropower?
Pros of Hydroelectric Energy
1. As a clean energy source widely used across the globe, hydropower has multi-dimensional core competitiveness: it relies on Earth’s water cycle to achieve perpetual use. Unlike gradually depletable fossil fuels such as coal and oil, it is a core option in the long-term energy layouts of many countries.
2. During its operational period, it produces almost no direct air pollution, with emission levels far lower than those of fossil fuel power plants. For this reason, it is included in countries’ climate emission reduction plans and can deliver multiple environmental benefits, such as cutting carbon emissions, improving air quality, reducing reliance on fossil fuels, and supporting the achievement of renewable energy targets.
3. Producing electricity from solar and wind sources is heavily reliant on the prevailing weather conditions. Compared to other sources, output from electricity generation from hydropower is predictable and reliable. Additionally, hydropower plants can manage the flow of water and generate electricity at the time of peak demand, thus balancing the electricity grid.
4. Hydropower plants are very capital-intensive to build, but once they are completed, the water that is used to generate the electricity is free, and the plants do not incur any costs to buy fuel.5. Hydropower stations are very long-lived, and their dams, built many years ago, are still operating to this day, resulting in very low operational costs over many years.
6. Reservoir areas can develop five types of recreational projects, such as fishing and boating, driving growth in the local cultural and tourism economy.
Cons of Hydroelectric Energy
Summary:
In global dialogues on energy issues, hydropower has always occupied a unique dialectical position: it is cleaner than fossil fuels, can stably output massive volumes of electricity over decades, and outperforms most other renewable energy sources in terms of scale and stability. Yet it also reshapes natural landforms, disrupts wildlife survival, and undermines the development of local communities. Moving beyond black-and-white binary judgments, the core priority is how to utilize hydropower responsibly. Drawing on technological iteration and growing environmental awareness to balance power generation and ecological protection, hydropower remains a core renewable energy tool for the world, carrying both notable potential and inherent challenges.
Hydroelectric Energy vs Other Renewable Energy Sources
Here’s how hydropower compares to other renewable energy technologies.
| Energy Source | Reliability | Environmental Impact | Operating Cost | Weather Dependence |
|---|---|---|---|---|
| Hydroelectric | High | Moderate to High | Low | Moderate |
| Solar | Medium | Low | Very Low | High |
| Wind | Medium | Low | Low | High |
| Geothermal | High | Low | Moderate | Low |
| Biomass | Medium | Moderate | Moderate | Low |
