The Thwake Dam project remains one of Kenya’s most advanced multipurpose water infrastructure developments under the national Mega Dam Construction program. As of 2026, the project continues to progress toward final completion after years of phased delivery delays and technical adjustments. Additionally, it plays a central role in Kenya’s broader shift toward irrigation-led agriculture, hydropower integration, and urban water supply security. As a result, the project remains a key benchmark in the country’s Vision 2030 water infrastructure rollout.

Thwake Dam Project Advances Toward Completion under Mega Water Construction Works

The Thwake Dam Project in Makueni and Kitui counties has reached advanced construction stages, with works surpassing 90% completion by early 2026. Moreover, engineers continue final works on structural components, hydro mechanical systems, and water impoundment preparation.

Additionally, authorities now expect full completion in 2026 following multiple timeline revisions linked to funding adjustments and technical foundation corrections. The dam integrates irrigation, hydropower, and bulk water supply systems into a single infrastructure asset.

Meanwhile, the project supports over 1.3 million residents through planned water supply distribution systems. It also links directly to Konza Technopolis, strengthening its role in Kenya’s industrial development strategy. Therefore, Thwake remains a critical anchor within the national water construction framework.

Furthermore, recent government and AfDB assessments confirm ongoing funding support to finalize remaining works. As a result, completion activity has shifted from major civil works to finishing, installation, and system integration phases.

Thwake Dam Project Strengthens Kenya Mega Dam Construction Pipeline

The Thwake Dam Project forms part of Kenya’s wider Mega Dam Construction program targeting irrigation expansion and climate resilience. Additionally, it supports agricultural transformation across Lower Eastern Kenya by enabling irrigation of tens of thousands of hectares.

Moreover, the project complements other national dams such as High Grand Falls, Galana, and Mwache under the same infrastructure strategy. These projects collectively aim to reduce reliance on rain-fed agriculture.

In contrast, earlier agricultural systems in the region suffered repeated drought impacts. Now, integrated dam construction projects like Thwake improve water reliability and food production stability. Consequently, Kenya strengthens long-term food security and rural economic resilience.

Meanwhile, hydropower integration adds energy generation capacity to the national grid. Irrigation infrastructure also expands downstream agricultural productivity. Therefore, Thwake operates as both a water security and energy infrastructure asset.

Thwake Dam Project Linked to High Grand Falls and National Water Construction Expansion

The Thwake Dam Project directly supports Kenya’s broader Mega Dam Construction program, which includes flagship projects such as the High Grand Falls Dam. Additionally, both projects form part of a coordinated national effort to expand irrigation to approximately 2 million acres.

Moreover, Thwake demonstrates the implementation model used across the program, combining Public-Private Partnerships, AfDB financing, and government infrastructure investment. This model now guides other large dam developments across ASAL regions.

Meanwhile, contractors including China Gezhouba Group and SMEC continue to play key roles in design and construction supervision. Kenyan engineering firms also support civil works, logistics, and implementation coordination.

Furthermore, environmental and regulatory agencies maintain oversight through compliance monitoring and water resource approvals. Consequently, the project reflects an integrated approach to large-scale infrastructure delivery.

Ultimately, the Thwake Dam Project remains a cornerstone of Kenya’s transition toward modern irrigation-based agriculture and multipurpose water infrastructure development.

Background of the Thwake Dam project

The Thwake Dam construction started in 2017, funded by the Government of Kenya and AfDB. Its goal is to address water shortages in arid and semi-arid areas.

Phase One of the Thwake Dam project focused on building the dam, with Ksh 32.342 billion from the government and Ksh 8 billion from AfDB. China Gezhouba managed the work, as noted in Business Daily Africa.

Phase Two, aimed at hydropower generation, was also funded by both parties. The third phase involves water supply and sanitation, while Phase Four focuses on irrigation development. However, delays arose due to funding shortfalls in Phase Two.

Phase Three covered water supply and sanitation, while the final phase focused on irrigation development. The total project cost is Ksh 82.21 billion, though delays have occurred due to funding shortages in Phase Two.

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Government and stakeholder efforts to fast-track Thwake Dam completion

PS Julius Korir emphasised that the government is actively engaging stakeholders to secure additional funds to speed up construction. The Water Ministry is focused on overcoming financial constraints to ensure timely completion.

PS Korir also shared the progress in water and sanitation services across Kenya. Nairobi County leads with 66% sanitation coverage, and national water coverage has risen to 73%, while sanitation coverage stands at 93%. Aiming for 100% coverage, the government has launched the Ksh 995 billion National Water and Sanitation Investment Plan.

Project Fact Sheet

Project Name: Thwake Dam Project (Thwake Multipurpose Water Development Project)

Country: Kenya

Location: Makueni & Kitui counties

Project Type: Multipurpose dam (irrigation, hydropower, water supply)

Status (2026): Near completion (90 %+), final works ongoing

Estimated Cost: $600–650 million equivalent (varies with revisions)

Funding Model: Government of Kenya + African Development Bank (AfDB)

Core Functions:

• Irrigation development (40,000 hectares planned)
• Hydropower generation (20 MW planned)
• Domestic and industrial water supply

Beneficiaries: 1.3 million people

Water Storage Capacity: 688 million cubic meters

Key Infrastructure Components: Dam wall, spillways, hydropower plant, irrigation canals, water treatment systems

Implementation Phases: Dam structure, hydropower installation, water supply systems, irrigation works

Lead Contractors: China Gezhouba Group Company (CGGC)

Consulting Engineers: SMEC International

Supervising Agencies: Water Resources Authority (WRA), Ministry of Water, Sanitation and Irrigation

Project Team

Project Owner: Government of Kenya

Lead Ministry: Ministry of Water, Sanitation and Irrigation

Co-Lead Ministry: Ministry of Agriculture and Livestock Development

Financier: African Development Bank (AfDB)

Co-Financing Partner: Government of Kenya

Main Contractor: China Gezhouba Group Company (CGGC)

Engineering Consultant: SMEC International

Regulatory Authority: Water Resources Authority (WRA)

Environmental Oversight: National Environment Management Authority (NEMA)

County Governments: Makueni County Government, Kitui County Government

Implementation Units: Thwake Project Implementation Team (TPIT), AfDB Project Task Team

Technical Stakeholders: Hydrology engineers, dam safety inspectors, irrigation development planners