Kenya’s National Social Security Fund (NSSF) is making a bold, high‑profile bet on the Nairobi–Nakuru–Mau Summit toll road as part of a wider push into infrastructure and real estate. If the project delivers the expected returns, it could meaningfully boost pension payouts while also transforming a critical transport corridor. (1)
Nairobi-Nakuru Toll Road Project Overview
The Rironi–Mau Summit section of the Nairobi–Nakuru highway (part of the A8) is being upgraded into a modern dual carriageway under a public–private partnership (PPP) toll‑road model. The broader project, which includes the Rironi–Gilgil and Rironi–Maai Mahiu–Naivasha sections, covers roughly 230–236 km of highway. (3)
The project was launched in late November 2025 and is valued at about KSh170 billion under the PPP arrangement, a figure widely cited in official and media reports. Officials have expressed a strong desire to complete the road before the 2027 General Election, though exact completion dates are framed as targets rather than fixed deadlines. Once finished, the road is expected to sharply cut travel times on the main artery linking Nairobi to the Rift Valley, western Kenya, and onward to regional hubs in Uganda, Rwanda, and the DRC. An alternate non‑tolled route will remain available for motorists who opt not to pay the tolls. (2)
Key Deal Highlights
Consortium and funding. NSSF is partnering with China Road and Bridge Corporation (CRBC) in a 40:60 joint venture to finance and operate key sections of the toll highway. For their portion (Rironi–Gilgil and Rironi–Maai Mahiu–Naivasha), the consortium will invest about US$743 million (≈KSh95.9 billion), within the broader PPP project valued at roughly KSh170 billion.
NSSF’s stake. The total equity injection for the toll‑road project is about US$185.75 million (KSh23.97 billion), with NSSF contributing KSh9.59 billion — equivalent to 40% of the equity share. The remaining funding (about 75% of the capital stack) will be raised as debt, largely arranged by CRBC and associated lenders.
Concession terms. The PPP is structured as a roughly 28–30‑year toll concession, with tolling expected to begin around 2028 once the upgraded highway is operational. Over this period, the consortium is targeting annual returns of about 10–15% in US dollar terms, which could translate to roughly 18% per year in Kenyan shilling terms, depending on currency movements. (1)
User tolling and traffic. The highway will operate as a toll road to allow investors to recoup their capital and earn a return, but an alternative free route will remain open at all times for non‑paying motorists. It is estimated that around 40,000 vehicles currently use the Rironi–Mau Summit corridor daily, providing a substantial potential toll‑paying user base once the upgraded road opens. (4)
NSSF’s Investment Strategy
NSSF is shifting part of its portfolio from a heavy concentration in fixed income into higher‑yielding infrastructure and property assets. Historically, about 85% of the fund’s roughly KSh558 billion in assets were invested in fixed‑income securities and listed equities, with bonds alone accounting for about 72% of the portfolio as of 2025. (1)
In the year to June 2025, NSSF declared a record 17% return on member savings and reported assets of about KSh575 billion, while outlining a plan to grow to roughly KSh1 trillion in assets by 2027. Management and trustees have highlighted the need to pursue new investment opportunities that offer better yields, especially in infrastructure and real estate, to sustain such double‑digit returns. (1)
Within this strategy, the Nairobi–Nakuru–Mau Summit toll road is a flagship project. Under the PPP structure, NSSF limits its risk exposure to the equity portion of the deal, leaving the Chinese partner and lenders to provide the majority of project debt while NSSF targets 10–15% annual returns in USD (about 18% in KES) over the 28–30‑year concession. (1)
The toll road sits alongside other ambitious projects, such as a planned KSh39 billion twin‑tower complex on Kenyatta Avenue in Nairobi (including a proposed 56‑storey tower) targeting roughly 13% annual returns. NSSF trustees stress that these investments are subject to regulatory oversight by the Retirement Benefits Authority (RBA) and internal investment guidelines aimed at safeguarding members’ savings. (1)
Returns, Fund Growth and Risk‑Sharing
NSSF’s push into roads is closely tied to its broader growth ambitions and return targets. The combination of the Rironi–Naivasha–Mau Summit expressway and major property projects is intended to help sustain high single‑digit to double‑digit returns while diversifying away from lower‑yield government securities. (1)
In the NSSF–CRBC PPP, forecasts indicate potential annual returns of about 10–15% in USD over the life of the 28–30‑year concession, assuming traffic volumes and toll revenues evolve broadly as projected from 2028 onward. If these targets are met, the resulting cash flows could materially boost NSSF’s investment income and, over time, support better benefit payouts for contributors. (1)
The PPP contract has been structured to balance investor incentives with the protection of public finances. Unlike some earlier deals, there is no minimum‑revenue guarantee from the state; instead, the agreement includes a revenue‑cap mechanism under which toll revenues above a specified threshold are shared with the government. This allows taxpayers to benefit from upside traffic performance while shielding the public from traffic‑shortfall risks that have complicated other toll projects such as the Nairobi Expressway.
A portion of toll revenues is earmarked for ongoing maintenance and future improvements of the corridor, aiming to ensure that the road remains in good condition throughout the life of the concession. This is intended to avoid the pattern where major roads deteriorate due to inadequate maintenance budgets once initial donor or government funding is exhausted. (3)
Broader Implications
New infrastructure financing model. By channelling domestic pension capital, in partnership with a Chinese infrastructure firm, Kenya can reduce its immediate sovereign borrowing requirements and potentially accelerate the delivery of large projects. The government has also signalled support for broader use of pooled infrastructure funds and pension‑scheme participation in PPPs, which could create a template for future roads, energy projects and other long‑lived assets. (5)
Economic and social gains. The upgraded Nairobi–Nakuru–Mau Summit highway is expected to ease chronic congestion, reduce accidents, and cut travel times between Nairobi, Nakuru and the wider western corridor. This should improve the flow of goods and people to and from neighbouring countries such as Uganda, Rwanda and the DRC, reinforcing the corridor’s role as a central trade route in East and Central Africa. (6)
Pension‑fund performance and governance. If the expected toll revenues materialise, the higher yields from the project could strengthen NSSF’s returns and help deliver better pensions for members over the long term. At the same time, past audits have highlighted governance and asset‑management weaknesses at NSSF, prompting management to exit non‑performing assets and tighten controls, which means large infrastructure bets like this will attract scrutiny from regulators and the public. (1) Overall, NSSF’s equity stake in the Nairobi–Nakuru–Mau Summit toll road is a significant test of Kenya’s strategy to use local pension savings to finance major infrastructure, and its success or failure will likely shape how similar projects are funded in the future. (5)
FAQs
1. Why is NSSF investing in the Nairobi–Nakuru–Mau Summit toll road?
NSSF is seeking higher long‑term returns and better diversification than it can get from mainly holding government bonds and listed equities. A mature toll road with stable traffic can generate predictable cash flows over decades, which helps the fund meet its target returns and improve member benefits.
2. How much is NSSF investing and what returns does it expect?
NSSF is contributing equity alongside CRBC, with its stake structured to be a minority share of the total project cost, while the bulk of financing comes from project debt. The fund is targeting double‑digit annual returns in hard currency, which could translate to higher effective returns in Kenyan shillings over the 28–30‑year concession period.
3. Will motorists be forced to pay tolls on this highway?
No. The plan is for the upgraded highway to operate as a toll road, but an alternative non‑tolled route is expected to remain open so motorists can choose whether or not to pay. The tolls are intended to pay back construction costs, finance maintenance, and provide a return to investors.
4. What are the main risks of this investment for NSSF members?
Key risks include lower‑than‑expected traffic volumes, changes in toll policy, currency volatility and construction or operational delays. To manage this, the PPP contract uses mechanisms such as revenue caps (sharing upside with the government instead of guaranteeing minimum revenue), and NSSF limits its exposure mainly to the equity portion while operating under regulatory investment guidelines and oversight.
