Central Asia's Energy Transition Hinges on Water Security

Central Asia is constructing a new energy system, driven by the rapid expansion of solar and wind generation, battery storage, and increased hydropower capacity in countries like Uzbekistan, Kazakhstan, Kyrgyzstan, and Tajikistan. Investments in stronger cross-border electricity connections are also underway, with Kazakhstan and Uzbekistan moving ahead with nuclear power projects. However, these ambitious energy transition plans are increasingly intertwined with a single, critical variable: water security. Climate change is rendering Central Asia's hydrology less predictable precisely as electricity demand is growing. Droughts can constrain hydropower output, extreme heat exacerbates power demand, and extensive irrigation systems consume vast amounts of electricity. Consequently, new generation assets must be designed to operate for decades under water conditions that may significantly diverge from historical averages. This confluence of challenges presents a unique opportunity. A more integrated and flexible Central Asian power system could not only reduce the costs associated with the energy transition but also mitigate the region's vulnerability to water shocks. Central Asia does not adhere to a single energy model. Kazakhstan remains heavily reliant on thermal and coal-fired generation, while Uzbekistan's system is largely gas-based, though solar, wind, and battery storage are expanding swiftly. Kyrgyzstan and Tajikistan depend heavily on hydropower, and Turkmenistan predominantly on natural gas. These divergent energy profiles, often perceived as vulnerabilities, can foster complementarity. Hydropower and reservoirs can provide essential flexibility to grid systems incorporating a growing share of variable renewable energy sources. Conversely, solar and wind power can diminish reliance on fluctuating hydrological conditions, and thermal generation can offer firm capacity while storage solutions mature. Cross-border electricity trade allows countries to leverage these diverse resources, obviating the need for each nation to maintain an isolated system capable of meeting every contingency independently. The economic rationale for integration is already compelling. Modeling by Agora Energiewende and the University of Central Asia suggests that deeper integration between Kazakhstan, Uzbekistan, and Kyrgyzstan, coupled with enhanced transmission infrastructure and greater renewable energy deployment, could reduce annual system costs by approximately $3.5 billion, or 18 percent, by 2035, compared to current projections. The World Bank's Regional Electricity Market Interconnectivity and Trade (REMIT) program is pursuing similar goals, aiming to increase annual regional electricity trade to at least 15,000 GWh, expand transmission capacity to 16 GW, and enable up to 9 GW of clean energy. However, interconnection alone does not guarantee resilience. This was starkly illustrated on August 14, when Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan all reported blackouts. The apparent cause was the sudden shutdown of two units at the Toktogul Hydroelectric Station in Kyrgyzstan, which disrupted power flow through the unified grid. Kyrgyz authorities, however, disputed that the Toktogul issue was solely responsible for the cascading outages in neighboring countries. Regardless of the precise cause, the incident underscores that interconnection, in isolation, does not inherently ensure resilience. Solar peaks can coincide across neighboring countries, and drought can simultaneously reduce hydropower output while extreme heat drives up electricity demand. Therefore, regional integration must be complemented by robust storage solutions, flexible generation, demand response mechanisms, strengthened grids, and coordinated operating rules. These measures will also provide countries with greater flexibility when another critical resource, water, becomes constrained. Historical averages are becoming less useful. As previously argued, water scarcity is evolving from an environmental concern into a significant economic, infrastructure, and regional cooperation risk. The World Bank reports that Central Asia has lost approximately 30 percent of its glacier surface area over the past 60 years. For Uzbekistan, water availability is projected to fall by 30-40 percent, while irrigation demand is expected to rise by about 25 percent. Crucially, climate change's impact extends beyond simply "less water." Research on the Amu Darya Basin indicates that accelerated glacier melt and altered precipitation patterns can, in some periods, temporarily sustain or even increase flows, even as seasonality, year-to-year variability, and extreme events become more pronounced. This distinction is vital for energy planners. Infrastructure such as reservoirs, hydropower plants, nuclear facilities, transmission systems, and irrigation networks built today will remain operational for decades. The pertinent question, therefore, is not merely the current water availability but the reliability of its arrival, its timing, and the competing demands it will face over the lifespan of these long-term investments. Hydropower vividly illustrates this dilemma. Kyrgyzstan and Tajikistan, heavily reliant on hydropower, utilize their reservoirs for storage and balancing services within a regional system incorporating more solar and wind. However, reservoir operations inevitably distribute costs and benefits across borders. Upstream countries might prioritize retaining water for winter electricity generation, while downstream agricultural systems depend on summer releases. Reconciling these priorities becomes significantly more challenging during periods of drought. Consequently, water management is no longer an external environmental constraint on the energy transition; it is increasingly integral to energy security itself. Water is not only critical to Central Asia's energy systems, but these systems also require energy to function. According to World Bank project documentation, approximately 2.4 million hectares of Uzbekistan's irrigated land depend on pumping, with roughly 1,700 pumping stations consuming about 7.2 TWh of electricity annually. Modernizing these pumping stations, reducing losses, and improving irrigation efficiency can simultaneously alleviate pressure on scarce water resources and decrease electricity demand. In practical terms, water efficiency can be viewed as an energy security investment. Put simply, water efficiency is also energy policy. The reverse is equally significant: energy flexibility can serve as a form of water resilience. Uzbekistan generated 10.5 TWh of electricity from solar and wind in 2025 and is rapidly expanding battery storage, with an additional 884 MW of storage scheduled for commissioning in 2026. Variable renewable energy sources are central to this evolving landscape. Source: The Diplomat Indonesia