Dams and Hydroelectric Power in Panama

Why hydropower matters in Panama

Panama’s electricity mix is dominated by hydropower. The country’s mountainous terrain, high rainfall on the Caribbean and upper-Pacific slopes, and concentrated river network give it unusually favourable conditions for hydroelectric generation. Most of the country’s electricity is generated from hydroelectric plants tied to the 11 major reservoirs; thermal (oil and diesel) generation fills the gap in dry years.

The country’s hydrological plan, ANAM’s Plan Nacional de Gestión Integrada de Recursos Hídricos (GIRH) 2010-2030, catalogues the reservoir system as part of the broader water-management framework^[1]. The plan records 67 lacustrine systems (25 lentic: 11 reservoirs and 14 lagoons, plus 42 freshwater wetlands) with the 11 reservoirs totalling 858–863 km² in surface area^[1]. The renewable water resource is approximately 228 billion m³/year, of which the Pacific vertiente holds about 64 % (149.6 billion m³) and the Caribbean vertiente about 36 %.

Lake Gatún: the canal lake

Lake Gatún is the 431 km² lake at the summit of the Panama Canal. It is the largest of the country’s reservoirs by surface area but is operated primarily for canal traffic (each transit uses roughly 200 million litres of fresh water, mostly lost to the ocean). Its hydroelectric contribution is the Gatún hydroelectric plant at the Gatún Dam, which generates a modest share of the national total; the canal operation takes precedence over power generation.

The 2023–2024 drought exposed the limits of the canal-first operating regime: lake levels fell to multi-decade lows, daily transits were reduced from the standard 36 to as few as 18, and Panama City / Colón drinking-water supply was stressed. The crisis is the most prominent recent operational constraint on the canal system and is the principal driver of the ACP’s recent water-management investment programme. The lake-gatun page in this section covers the lake in detail.

Lake Bayano: the largest single-purpose reservoir

Lake Bayano is the 127 km² reservoir on the Río Bayano in eastern Panamá Province, completed in 1976 as the centrepiece of the Bayano hydroelectric complex. The dam is at the centre of Panama’s single largest hydroelectric installation; the reservoir’s size, the reliable water supply from the Bayano basin, and the operating head make the Bayano complex the cornerstone of Panama’s electricity supply in normal water years.

The Bayano Dam and reservoir were built during the Omar Torrijos era. The construction required the relocation of several Emberá and Kuna communities and is one of the most-disputed infrastructure projects in Panama’s modern history for its social and cultural impact on Indigenous populations. The reservoir area includes several islands that were formerly hilltops and that today host small communities and traditional-use sites.

Hydrological management of the Bayano reservoir is part of the country’s broader drought-response framework. The reservoir’s 127 km² surface area and significant storage capacity make it the most useful single buffer against drought in the Pacific-side electricity system, and it carries a disproportionate share of the national system’s response when other reservoirs are stressed.

The 11 major reservoirs

Beyond Gatún and Bayano, the major hydroelectric reservoirs in Panama include:

• Fortuna (Chiriquí). On the Río Chiriquí, completed in 1984. The Fortuna reservoir is the third-largest reservoir in the country and the second-most-important single-purpose hydroelectric installation.
• Estí (Chiriquí). On the Río Estí, a smaller reservoir in the western highlands.
• Los Valles (Chiriquí). A smaller reservoir in the same general area.
• Río Changuinola (Bocas del Toro). The Changuinola complex (Chan 75 and Chan 140) was built on the Río Changuinola in the Caribbean-side highlands of Bocas del Toro Province. The dams and reservoirs are on territory overlapping with the Ngäbe-Buglé comarca and have been the subject of long-running community opposition and legal disputes.
• Santa María. A Pacific-side reservoir in Veraguas, completed in the 1990s.
• El Encantado. A smaller Pacific-side reservoir.
• La Yeguada. A smaller Pacific-side reservoir in Veraguas.
• Doña Juana. A smaller reservoir in the highlands.

The total installed hydroelectric capacity is dominated by the four largest plants (Bayano, Fortuna, Gatún, Changuinola); the remaining plants are smaller and are mostly run-of-river or storage-augmented.

The 2023–2024 El Niño crisis

The 2023–2024 El Niño was one of the strongest on record, peaking at ONI +2.1 in December 2023. The event exposed the limits of Panama’s hydropower dependence:

• Gatún Lake levels fell to multi-decade lows. Daily transits were reduced from 36 to as few as 18 per day.
• Drinking-water restrictions were imposed in Panama City and Colón.
• Electricity supply was temporarily supplemented by thermal generation, increasing the country’s reliance on imported oil.
• Hydroelectric reservoir levels across the system fell below their long-term means, with some smaller reservoirs approaching minimum operating levels.

The crisis prompted renewed attention to water-management investment and demand-management options (transit reservation systems, water-saving basins in the lock chambers, watershed reforestation). It also accelerated the ACP’s water-supply augmentation planning, although no major new reservoir has yet been confirmed.

Water-management policy

Panama’s water-management policy is set by the Autoridad Nacional de los Servicios Públicos (ASEP) and the broader MiAmbiente framework. The GIRH 2010-2030 plan is the principal long-term policy document^[1], with the ASEP Plan de Acción para el Desarrollo Energético (PADE) covering the electricity-sector aspects. The interaction between the canal’s water use, the electricity sector’s reservoir operation, and the urban water-supply system is one of the more complex water-management arrangements in Latin America.

The Centro Nacional de Despacho (CND) operates the electricity grid in real time. During dry periods, the CND coordinates thermal generation to back-fill the lost hydropower, with the cost passed through to the national tariff.

Environmental and social context

The hydroelectric system has substantial environmental and social context:

• Forced relocations. Several Indigenous communities were displaced by the construction of Gatún (early 20th century), Bayano (1976), Changuinola (2010s), and earlier projects. The relocation histories are part of the broader Panamanian reckoning with infrastructure development.
• Watershed impacts. Reservoirs change downstream hydrology, fish migration, and sediment transport. The Panama Canal’s freshwater management is the most-studied case; the Bayano, Changuinola, and other reservoirs have their own study literature.
• Climate vulnerability. The 2023–2024 drought showed that the system’s vulnerability to climate variability is greater than the long-term planning assumed. Future investment will need to address this.

Smaller reservoirs and run-of-river plants

In addition to the 11 major reservoirs, Panama has roughly a dozen smaller hydroelectric facilities, mostly run-of-river installations under 50 MW. These include:

• Bajo de Mina and Los Valles (Chiriquí), small storage-augmented plants on tributaries of the Río Chiriquí Viejo.
• Estí (Chiriquí), completed in 2002, ~65 MW, on the Río Estí.
• Caisán (Chiriquí), small storage facility.
• Prudencia (Veraguas), run-of-river plant on the Río Santa María.
• El Fraile and El Coco (western Veraguas), small plants on Río San Pablo tributaries.

These smaller plants contribute meaningfully to the national supply in normal water years and are generally less controversial than the major reservoirs, but they share the climate-vulnerability profile: in dry years, output drops sharply.

The Changuinola dispute

The Changuinola hydroelectric complex (Chan 75 and Chan 140) on the Río Changuinola in Bocas del Toro Province has been the subject of long-running opposition from the Ngäbe-Buglé Indigenous comarca, which overlaps with the reservoir lands. The project was developed by AES Panamá and inaugurated in 2011 after years of community protests; legal challenges and operational disputes have continued since. The Changuinola dispute is the largest ongoing Indigenous-vs-hydroelectric conflict in Panama and is widely cited in regional debates over the social license for large dams.

Looking ahead: the reservoir optimisation question

Panama’s hydroelectric system has been built out over more than a century, and most of the best sites are already developed. Future capacity growth is constrained by climate, environmental, and Indigenous-rights considerations; large new reservoirs on undeveloped rivers are essentially off the table for political reasons. The optimisation path forward runs through:

• Modernisation of existing facilities, replacing turbines, improving efficiency, and adding small pumped-storage components at the major dams.
• Solar and wind complementarity, the ACP and ASEP have both studied pumped-solar and wind-solar hybrid installations as drought-resilience complements to the existing hydropower base.
• Demand management, the canal’s water-saving lock basins, transit reservation systems, and industrial tariff reforms can reduce peak water demand without new supply.
• Watershed restoration, reforestation in the upper Chagres basin stabilises dry-season flow and is one of the highest-benefit-cost investments available.

The combined effect of these measures will determine whether the system can meet the country’s growing electricity demand over the next 20 years, given the climate-vulnerability profile that the 2023–2024 drought made visible.

When to skip and when to read on

If you only have a minute, the load-bearing facts are: Panama has 11 major hydroelectric reservoirs totalling 858–863 km², supplying most of the country’s electricity; the system rests on Lake Gatún (the canal’s 431 km² summit lake) and Lake Bayano (127 km², the largest single-purpose reservoir); the 2023–2024 El Niño drought exposed the limits of the system’s climate vulnerability. The lake-gatun page in this section covers the canal’s freshwater system; the canal-drought-and-water page in the canal section covers the 2023–2024 crisis; the environmental-challenges page covers the broader environmental context; and the chiriqui-highlands page covers the western highlands where several of the smaller reservoirs sit.

Quick reference

Last reviewed: 2026-07-03