Is Kenya Suitable for Geological Carbon Storage?

Kenya generates around 90% of its electricity from renewable sources, so it is rarely the first country people think of when they hear “carbon capture and storage” (CCS). Yet the question is becoming more relevant. Cement, steel and other heavy industries are growing, geothermal fields release natural CO2, and a new wave of direct air capture (DAC) developers is looking for places to put carbon permanently. Whether Kenya can host safe, long-term storage depends on geology first and policy second.

This article explains what makes a rock formation suitable for CO2 storage, reviews Kenya’s main geological settings against those criteria, and highlights the risks and data gaps that must be closed before any project moves forward.

How Geological Carbon Storage Works

Geological carbon storage means injecting captured CO2 into a deep rock formation where it stays trapped for thousands of years. Injection normally takes place below about 800 metres, where pressure and temperature keep CO2 in a dense “supercritical” state. In this state, a given volume of rock can hold far more CO2 than it could as a gas.

A good storage site needs three things, often summarised as capacity, injectivity and containment.

• Capacity: enough connected pore space, or reactive rock, to hold the planned volume of CO2.
• Injectivity: permeability high enough that CO2 can be pumped in at acceptable pressures.
• Containment: a low-permeability seal (caprock) and a lack of leaky faults or old wells.

Once injected, CO2 is held by several trapping mechanisms: structural trapping beneath a seal, residual trapping in pore spaces, dissolution into formation water, and finally mineral trapping, where it reacts with rock to form solid carbonate minerals.

Kenya’s Geological Setting at a Glance

Kenya’s geology is dominated by three broad domains, and each behaves very differently as a carbon store.

1. Precambrian basement rocks (gneiss, schist, granite) cover much of the west, centre and south-east. They are dense, crystalline and generally lack the pore space needed for CO2 injection.
2. The Cenozoic volcanic Rift Valley and flanking plateaus, built by basalt, trachyte, phonolite and volcanic ash from about 30 million years ago to the present. These rocks host Kenya’s geothermal systems.
3. Sedimentary basins such as the Lamu Basin on the coast, the Anza Basin in the north-east, the Mandera Basin, and the rift-related Lokichar and other Turkana basins in the north-west.

Only the sedimentary basins and parts of the volcanic pile are realistic candidates for storage.

Option 1: Saline Aquifers in the Sedimentary Basins

Deep saline aquifers, sandstone layers filled with salty water unfit for drinking, hold most of the world’s estimated storage capacity. Kenya’s sedimentary basins contain thick Mesozoic and Cenozoic sequences with sandstones, shales and carbonates, and decades of petroleum exploration have produced seismic data and wells.

Several features are encouraging:

• Thick sedimentary packages with alternating reservoir and seal rocks.
• Existing seismic and well data in the Lamu, Anza and Lokichar areas, which can shorten early screening.
• Low population density across much of the northern basins, which reduces surface conflicts.

The challenges are equally real. The Turkana rift basins are structurally complex, with many faults that could affect seal integrity. Hot rift-related geothermal gradients reduce the depth at which CO2 becomes supercritical, and can mean shallower, smaller storage windows. The coastal Lamu Basin is better suited structurally but sits near sensitive marine and coastal ecosystems. Publicly available, quality-controlled data remain limited, and no one has published a national storage atlas at the standard of those produced for Europe or North America.

Option 2: Basalt and Carbon Mineralisation in the Rift Valley

The most distinctive Kenyan opportunity is not conventional storage at all. Basalt is rich in calcium, magnesium and iron, the elements that combine with dissolved CO2 to form stable carbonate minerals such as calcite and magnesite. The CarbFix project in Iceland showed that when CO2 dissolved in water is injected into fresh basalt, most of it turns to solid carbonate within about two years, far faster than earlier models predicted.

Kenya’s Rift Valley contains extensive Quaternary and Neogene basalts and related volcanic rocks, and the surrounding area already has deep drilling expertise from geothermal development at Olkaria, Menengai and Longonot. Geothermal power plants also vent non-condensable gases that include CO2, so a ready, local source exists for a pilot.

Important questions remain:

• Rock reactivity and porosity: Rift lavas are layered with fractured zones, scoria and tuff. Some layers will accept fluid easily while others will not.
• Water supply: Dissolving CO2 before injection needs large volumes of water, and the Rift is water-stressed. Using brine from geothermal wells or non-potable water is essential.
• Groundwater protection: Injection must be separated from shallow aquifers that supply boreholes, farms and towns.
• Geothermal conflict: Hot reservoirs cooling or becoming chemically altered by CO2 could harm energy production, so site selection must avoid productive steam fields.

Direct air capture companies working in Kenya’s Rift, including Nairobi-based Octavia Carbon, have drawn attention to this combination of renewable geothermal heat, basalt geology and local expertise. Project details change quickly, so anyone planning work should check current announcements and permits.

Seismic and Volcanic Risk

The Eastern branch of the East African Rift is tectonically active. Faults slip, ground fractures open, and small earthquakes are frequent. For CO2 storage, the main concerns are:

• Induced seismicity: raising pore pressure at depth can reactivate faults. Careful monitoring and pressure management are essential.
• Fault leakage: natural faults can act as conduits, particularly in the volcanic Rift floor.
• Volcanic gas: several Rift volcanoes, including Longonot, Suswa and Menengai, are potentially active, and natural CO2 seepage already occurs in places.

None of these rules out Kenyan storage, but each requires proper site characterisation, baseline gas monitoring and a conservative approach to injection pressure.

Legal and Regulatory Readiness

Geology alone does not make a site “suitable”. A storage operator needs clear rules on pore-space ownership, site selection, injection permits, monitoring, liability and post-closure responsibility.

Kenya has built a framework for climate action through the Climate Change Act 2016 as amended, and has introduced carbon market regulations. As far as I know, there is no dedicated CCS law yet. A project would probably have to navigate the Environmental Management and Co-ordination Act (EMCA), the Mining Act and Petroleum Act, the Water Act, and county-level land arrangements. That overlap creates uncertainty. Developers and investors typically prefer a single, clear permitting route, and international best practice, such as ISO 27914 on geological storage of CO2 and the EU CCS Directive, offers templates.

Economics and Real Demand

Kenya’s emissions per person are low, and its grid is already clean, so the case for “domestic” CCS is narrower than in coal-heavy economies. The most plausible demand comes from:

• Cement and lime production, where about 60% of emissions come from the chemistry of limestone calcination rather than fuel.
• Steel and other industrial clusters, as they develop.
• Geothermal gas management.
• Carbon removal projects, such as DAC with permanent storage, selling credits to international buyers.

For these cases, costs, transport distances and access to verification will decide viability. The Rift basalt route may reduce transport costs if capture happens close to injection.

What Needs to Happen Next

A credible assessment would move through staged screening, roughly in this order:

1. Regional screening: compile existing geological, geophysical, well and hydrogeological data into a national storage atlas.
2. Basin and play assessment: rank prospects by capacity, depth, seal quality and fault risk.
3. Pilot injection: small, well-monitored tests in basalt and in a sedimentary reservoir.
4. Monitoring baselines: collect seismic, soil gas, groundwater and surface deformation data before injection starts.
5. Policy alignment: clarify permitting, liability and community benefit-sharing.

Community engagement is part of the geology workflow, not an add-on. Land users in the Rift, from pastoralist communities to flower farms, rely on groundwater and need clear information and genuine participation.

Bottom Line

Kenya is conditionally suitable for geological carbon storage. The strongest scientific case lies in carbon mineralisation in Rift Valley basalts, paired with geothermal infrastructure and heat. Deep saline aquifers in the sedimentary basins remain promising but poorly characterised. Seismic activity, water scarcity, groundwater protection and an unfinished regulatory framework are the main constraints. The honest answer today is “potentially, but proof requires data”: detailed site studies, pilot tests and strong monitoring must come before any large-scale claim.

If you are assessing a project, a registered geologist or geoscience consultant can help screen sites, review subsurface data and prepare the technical case for regulators.

References and Further Reading

• Matter, J.M. et al. (2016). Rapid carbon mineralization for permanent disposal of anthropogenic carbon dioxide emissions. Science, 352, 1312-1314.
• Global CCS Institute, Global Status of CCS annual reports.
• IPCC Special Report on Carbon Dioxide Capture and Storage (2005) and the IPCC Sixth Assessment Report, Working Group III.
• ISO 27914:2017, Carbon dioxide capture, transportation and geological storage: Geological storage.
• Republic of Kenya, Climate Change Act 2016 (as amended) and Climate Change (Carbon Markets) Regulations.