Tanzania’s Sh25 Billion Geothermal Drilling Programme at Ngozi Crater and Kiejo‑Mbaka Targets Baseload Renewable Power and Energy Security
Tanzania’s allocation of Sh25 billion for geothermal drilling is a clear signal that the country is moving from talk to action on baseload renewables, targeting fields like Ngozi Craters and Kiejo‑Mbaka to diversify its power mix, strengthen energy security and open the door for future geothermal power plants.
Tanzania’s geothermal push: from vision to funded wells
For years, Tanzania has talked about tapping its substantial geothermal potential to backstop hydropower and reduce reliance on thermal generation, but progress has been slow and mostly limited to studies and early exploration. The recent allocation of Sh25 billion specifically for geothermal drilling changes that dynamic by underwriting the riskiest, most capital‑intensive stage of development: drilling the wells that will confirm the resource.
Drilling is where geothermal projects often stall, especially in emerging markets, because the upfront costs are high and the resource risk is real. Public funding for these first wells can therefore act as a catalyst for future private investment. Once the reservoir is proven and temperature, flow and chemistry data are available, risk drops sharply and the project begins to look much more like conventional infrastructure from a financing perspective. Tanzania’s move, then, is not just about spending on holes in the ground; it is about strategically de‑risking future baseload renewable assets.
Why Sh25 billion matters in the Tanzanian context
On paper, Sh25 billion is a relatively modest sum compared to the trillions of shillings associated with Tanzania’s broader megaproject pipeline, but in geothermal terms it is significant. Geothermal wells are expensive, and this allocation suggests a focused programme to drill multiple exploration and possibly appraisal wells in priority fields.
From a policy perspective, the allocation sends three important signals. First, it shows a budgetary commitment to geothermal that goes beyond sporadic workshop funding or equipment purchases. Second, it demonstrates that the government is willing to shoulder the exploration risk rather than leaving it entirely to developers, a key factor in attracting future investment. Third, it aligns with Tanzania’s stated ambition to generate substantial megawatts from geothermal in the medium term, moving that ambition from target to tangible line items in the national budget.
Focus fields: Ngozi Crater and Kiejo‑Mbaka
Among Tanzania’s numerous geothermal prospects, Ngozi Crater and Kiejo‑Mbaka in Mbeya Region have emerged as priority targets. Both fields sit in an area of active tectonics and volcanism along the East African Rift system, where heat flow is elevated and surface manifestations such as hot springs and fumaroles point to deeper geothermal systems.
Ngozi Crater, in particular, has been highlighted as a flagship project. Previous steps—including the acquisition of drilling equipment and site preparation—suggest that the field is moving from desk‑study phase into physical development. A dedicated drilling programme funded by the Sh25 billion allocation can now test the resource directly, measuring reservoir temperature, permeability and pressure and evaluating whether the field can support commercial power generation.
Kiejo‑Mbaka, also in Mbeya, has similarly been identified as a promising geothermal prospect. Drilling here can help confirm whether the subsurface system is suited to power generation, direct‑use applications (such as industrial heat or agro‑processing), or a combination of both. Together, Ngozi and Kiejo‑Mbaka form the spearhead of Tanzania’s geothermal drilling push, and success at these fields would create a strong case for expanding exploration to other prospects across the country.
Drilling as the critical bridge from resource to power
In geothermal development, drilling is the bridge that connects conceptual resource estimates with actual power plant design. Before wells are drilled, developers and policymakers work largely with inferred data—geological mapping, geophysical surveys, geochemistry of surface fluids and regional heat‑flow models. While these tools are powerful, they cannot replace direct measurements from downhole.
The Sh25 billion allocation therefore represents Tanzania’s decision to cross that bridge. Drilling exploration wells will provide the hard data needed to answer core questions:
- Is reservoir temperature high enough to justify a commercial power plant?
- Is permeability sufficient to sustain long‑term production without rapid pressure decline?
- How complex is the fluid chemistry, and what does that imply for scaling and corrosion management?
- What is the likely sustainable capacity of the field in megawatts, and how many production and reinjection wells are required?
Once these questions are answered, project designs can move from generic assumptions to site‑specific engineering and financial modelling, making geothermal a credible entry in Tanzania’s future generation plan rather than a speculative line.
Geothermal in Tanzania’s evolving generation mix
Tanzania’s existing electricity mix is dominated by hydropower and thermal (mostly gas and some liquid fuels), supported increasingly by solar and other renewables. While hydropower offers low‑cost energy when water levels are high, it is vulnerable to droughts and climate variability, which have already affected output and forced greater reliance on thermal generation at times. Gas‑fired power is more flexible but exposes the country to domestic supply constraints and broader commodity price cycles.
Geothermal offers a different profile. Once built, geothermal plants can deliver stable baseload output largely independent of weather and day‑night cycles. Unlike hydropower, they do not rely on rainfall; unlike solar, they are not intermittent. For a rapidly growing economy, this kind of firm renewable capacity can play a crucial role in supporting industrial demand, urban growth and the expansion of electrification.
By investing directly in geothermal drilling, Tanzania is effectively laying the groundwork for a new pillar in its generation mix—one that can stabilise the system as variable renewables scale up and hydrological risks intensify under climate change.
Economic and energy‑security benefits
Beyond pure capacity considerations, geothermal development backed by the Sh25 billion allocation can bring broader economic and energy‑security benefits. First, geothermal power reduces exposure to imported fuels. Although Tanzania has domestic gas resources, it still faces foreign‑exchange pressures related to fuel imports for thermal plants and transportation. Building plants that run on indigenous heat rather than imported hydrocarbons can help stabilise the country’s external balance over time.
Second, geothermal projects can stimulate local economic activity through drilling contracts, construction jobs and ancillary services. As wells are drilled and plants built, local companies gain experience and capacity in specialised fields such as drilling services, cementing, logging and reservoir management. This capacity can later be exported to other countries in the region, positioning Tanzania as not just a geothermal host but a provider of geothermal expertise.
Third, baseload geothermal power can support industrial policies and regional development plans. Stable, predictable electricity is a prerequisite for attracting energy‑intensive industries, and siting such industries near geothermal hubs in regions like Mbeya can create new growth poles outside traditional urban centres.
The role of TGDC and institutional architecture
The Tanzania Geothermal Development Company (TGDC) sits at the centre of this emerging geothermal roadmap. As a specialised entity mandated to identify, assess and develop geothermal resources, TGDC provides the institutional architecture needed to manage complex, long‑term projects that span exploration, drilling, reservoir modelling and plant development.
Allocating Sh25 billion for drilling through or alongside TGDC reinforces the company’s role as geothermal champion. It enables TGDC to coordinate technical work, manage contractors, and engage with international partners from countries with advanced geothermal sectors, such as Kenya, Iceland, New Zealand and Japan. Over time, TGDC’s portfolio of projects, data and partnerships will form a national knowledge base that reduces risk for future developments and helps ensure that each new well builds on lessons from the last.
Regional collaboration and knowledge transfer
Tanzania is not pursuing geothermal in isolation. East Africa is already home to world‑class geothermal developments, particularly in Kenya, where fields like Olkaria and Menengai have been drilled and commercialised at scale. Collaboration with regional players can accelerate Tanzania’s learning curve, allowing it to avoid common pitfalls and adopt proven best practices.
Partnerships with entities such as KenGen and other experienced operators can provide practical guidance on:
- Drilling strategies and rig management in rift‑valley geology.
- Reservoir testing and sustainable production planning.
- Plant design tailored to specific temperature regimes (single‑flash, binary, hybrid schemes).
- Risk‑sharing mechanisms that combine public and private capital efficiently.
By aligning its Sh25 billion drilling programme with such collaborations, Tanzania can convert budgeted shillings into bankable projects more quickly, ensuring that wells drilled today translate into megawatts on the grid tomorrow rather than stalled assets.
Challenges and risks: making the allocation count
While the allocation is a strong positive signal, it does not guarantee success on its own. Geothermal projects everywhere face technical, financial and institutional challenges, and Tanzania will need to navigate these carefully to ensure the Sh25 billion is used effectively.
Technical risk remains inherent in drilling; some wells may underperform or reveal less favourable conditions than expected. Robust pre‑drilling studies, flexible drilling strategies and adaptive reservoir modelling will be essential to minimise dry‑hole risk. Financially, the trajectory from drilling to plant construction will require larger capital volumes than the initial allocation, and Tanzania will need to mobilise additional funding from public, private and multilateral sources.
Institutionally, clear governance, transparent procurement and disciplined project management will be critical. Geothermal timelines are long and cross multiple budget cycles, making consistent political and administrative support crucial. Ensuring that drilling programmes are guided by coherent master plans rather than fragmented initiatives will help maintain momentum and investor confidence.
Positioning geothermal within Tanzania’s climate and development narrative
As global climate policy tightens and green finance flows expand, Tanzania’s geothermal investments can be framed not only as power projects but as climate‑aligned development tools. Baseload geothermal plants contribute to emissions reduction by displacing fossil‑fuel generation, supporting nationally determined contributions (NDCs) under the Paris Agreement and aligning with broader goals of low‑carbon growth.
At the same time, geothermal projects can be integrated with local development priorities, such as:
- Direct‑use applications for agro‑processing, greenhouse farming, fish drying and industrial heat.
- District heating or cooling in urban and peri‑urban areas, where feasible.
- Tourism and wellness around geothermal sites, if carefully managed to avoid resource conflicts.
By presenting the Sh25 billion allocation as part of a holistic geothermal strategy that supports energy, climate and socio‑economic objectives, Tanzania can position itself favourably in the eyes of climate‑finance providers and development partners.
What success could look like over the next decade
If Tanzania manages geothermal drilling effectively and follows through with plant development, the next decade could see a meaningful transformation of its power system. Success would likely include:
- Proven reservoirs at Ngozi Crater and Kiejo‑Mbaka with clearly defined capacities and development plans.
- At least one operational geothermal power plant feeding firm renewable electricity into the grid, reducing reliance on thermal generation and enhancing resilience during droughts.
- A pipeline of additional geothermal projects at other prospects, supported by accumulated technical know‑how and data.
- A stronger domestic geothermal services industry and increased regional engagement as Tanzania contributes to East Africa’s broader geothermal ecosystem.
In that scenario, the Sh25 billion drilling allocation would be remembered as the catalytic investment that moved geothermal from promise to practice—transforming hot rocks and steam under Mbeya into dependable megawatts that power homes, industries and the country’s long‑term development.
Related: Yeager Energy Acquires Aardwarmte Vierpolders, Expands Dutch Geothermal Portfolio to 60 MWth
Source: The Citizen TZ
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