Water and energy are two of the most pressing challenges of the 21st century, both central to the United Nations Sustainable Development Goals (SDGs). While hydropower is typically classified under SDG 7 (Affordable and Clean Energy), its contribution to SDG 6 (Clean Water and Sanitation) is equally significant. Hydropower is not only the world’s largest source of renewable electricity but also a critical enabler of water storage, irrigation, flood control, and reliable municipal supply. Globally, hydropower accounts for about 16% of electricity generation and 60% of all renewable power (International Energy Agency, 2023). At the same time, the infrastructure it creates—reservoirs, dams, and pumped storage systems—underpins human access to clean water.

This article examines hydropower’s market dynamics and its unique role in advancing SDG 6. Drawing on global data, regional patterns, company strategies, and policy trends, it argues that hydropower represents both a market growth opportunity and a developmental necessity in ensuring universal access to safe water and sanitation.

The Hydropower Market Landscape

As of 2022, global installed hydropower capacity reached 1,400 gigawatts (GW), making it the single largest renewable source of energy (IRENA, 2023). Unlike wind and solar, which are intermittent, hydropower provides reliable baseload power and grid balancing through storage reservoirs and pumped storage facilities. Its dual role as an energy generator and a water manager makes it unique among renewables.

Regional dynamics highlight a differentiated growth story:

• Asia-Pacific dominates, led by China, which has over 390 GW of installed capacity, including the world’s largest dam, the Three Gorges (22.5 GW), and the new Baihetan project (16 GW). India, with 46 GW of hydro, is scaling up through NHPC and private utilities.
• South America is highly dependent on hydropower, with Brazil sourcing about 60% of its electricity from hydro, anchored by the Itaipú and Tucuruí dams.
• Europe is a mature market, with Austria, Norway, and Switzerland relying heavily on hydro for clean energy but now focused on modernization and digital upgrades.
• North America continues to depend on legacy assets such as the Hoover and Grand Coulee Dams, but new investment is flowing into pumped storage projects.

According to BloombergNEF, hydropower investment is projected to reach $300 billion by 2030, with over 60% of this spending directed toward modernization of existing plants rather than new construction.

Hydropower and SDG 6 Interlinkages

Hydropower projects are multi-purpose by design. Beyond electricity generation, dams and reservoirs contribute directly to SDG 6 targets by ensuring clean water availability, sanitation, and resilience.

• Water supply security: Multipurpose reservoirs supply drinking water to major urban centers. For example, the Hoover Dam supports water delivery for 25 million people across Nevada, Arizona, and California.
• Flood and drought management: Dams regulate extreme water events, reducing disaster risks for downstream communities. In India, projects in Himachal Pradesh and Uttarakhand balance irrigation and flood protection.
• Sanitation linkages: By ensuring predictable water flows, hydropower indirectly enables wastewater treatment facilities to operate consistently.
• SDG synergies: Hydropower exemplifies cross-SDG alignment. It supports SDG 6 (water), SDG 7 (energy), and SDG 13 (climate action) by fostering resilience against climate-induced shocks.

At the same time, challenges exist: large dams may displace communities, disrupt ecosystems, and alter sediment flows. Thus, achieving SDG 6 through hydropower requires striking a balance between water access and ecological stewardship.

Competitive Landscape: Publicly Listed Hydropower Companies

The global hydropower market is shaped by both state-owned utilities and publicly listed companies. These firms not only drive technological upgrades but also shape investor interest in sustainable infrastructure.

• Brookfield Renewable Partners (Canada): A global leader with 200+ hydropower plants totalling 16.4 GW, Brookfield integrates hydro with wind, solar, and storage. Its stable long-term contracts make it a favoured choice among ESG investors.
• Verbund AG (Austria): The largest utility in Austria, Verbund generates nearly 90% of its electricity from hydropower. It has pioneered digital hydropower operations in Europe.
• China Yangtze Power (China): Listed on the Shanghai Stock Exchange, it owns the Three Gorges Dam and manages over 71 GW of hydro capacity, making it the world’s largest hydropower producer.
• RusHydro (Russia): With 27.6 GW of installed hydro, it is one of the world’s top five hydropower companies, though geopolitical risks impact its global perception.
• Eletrobras (Brazil): Latin America’s largest power company, operating key assets including the Tucuruí Dam and co-managing the Itaipú Dam.
• NHPC Limited (India): India’s leading hydropower developer with about 7 GW operational and targets of 20 GW by 2030.
• JSW Energy and Tata Power (India): Both have significant hydro portfolios in addition to renewables, playing an important role in India’s clean energy mix.

The competitive trend is clear: hydropower companies are increasingly integrated renewable utilities, positioning themselves as central actors in the energy-water nexus.

Market Drivers and Challenges

Hydropower expansion is driven by structural and policy factors:

Market Drivers

• Decarbonization push: Hydropower remains a critical renewable option for countries meeting Paris Agreement commitments.
• Grid stability: Unlike solar and wind, hydro can provide continuous baseload power and act as a backup during intermittency.
• Water-energy nexus: Hydropower projects enable governments to simultaneously pursue water and energy security, a strong ESG narrative.

Challenges

• Capital intensity: Hydropower plants require billions in upfront costs, with long payback periods.
• Environmental and social concerns: Large dams alter river ecosystems and displace communities.
• Climate risks: Melting glaciers and erratic rainfall are threatening hydro generation potential in regions like the Himalayas and Andes.
• Regulatory hurdles: Lengthy permitting and cross-border river disputes (e.g., Mekong basin) complicate project development.

Innovation Trends

Hydropower is not static; the industry is innovating to stay relevant in the renewable mix:

• Small and Micro Hydro: Decentralized, community-level projects reduce ecological impact and enhance rural electrification.
• Pumped Hydro Storage (PHS): Becoming the world’s most scalable energy storage solution, with Australia’s Snowy 2.0 and India’s 18+ proposed projects leading the charge.
• Digital Twins and Smart Monitoring: Utilities like Verbund are using real-time data to optimize turbine performance and predict failures.
• Hybrid Models: Floating solar arrays on hydropower reservoirs (piloted in China and India) combine two renewables for higher efficiency.

Policy and ESG Perspective

Governments and investors are aligning hydropower with sustainability frameworks. India’s National Hydropower Policy grants renewable energy status to hydro projects, unlocking green finance. In the EU, modernization programs are extending hydro plant life cycles to 80–100 years. Globally, green bonds are being issued to finance large hydro projects—China and Brazil lead in this space.

For ESG-conscious investors, hydropower offers long-term stable returns and resilience against climate volatility. However, companies must demonstrate strong environmental and social safeguards to qualify for sustainable financing instruments.

Conclusion

Hydropower stands at the intersection of clean water and clean energy, uniquely positioned to advance SDG 6 and SDG 7 together. Beyond generating electricity, dams regulate water flows, provide drinking water storage, support irrigation, and safeguard against floods and droughts.

From an investment perspective, hydropower is a mature but evolving market, with growth in Asia, modernization in Europe, and diversification strategies by leading utilities worldwide. While challenges around environmental impact, capital costs, and climate risks remain, innovation in pumped storage, micro-hydro, and digital optimization is shaping a resilient future.

Ultimately, the question is not whether hydropower contributes to SDG 6, but how effectively governments, companies, and communities align its benefits with sustainability safeguards. If harnessed responsibly, hydropower can be one of the strongest market-linked tools to deliver clean water and sanitation for all while supporting a net-zero energy transition.