Across Africa, the institution will prioritize sectors seen as critical for growth, including financial services, energy, transport, trade, digital infrastructure and sustainable industries.
These areas are considered essential for job creation, business expansion and long-term economic stability.
Climate finance will play a larger role in the new strategy. BII expects at least 40% of its investments to support climate-related projects, up from 30% in its previous plan.
The move comes as the continent continues to face major energy gaps, with nearly 600 million people still without access to electricity.
The institution said it will support renewable energy projects, improve power grids and expand access to clean energy, while contributing to broader initiatives such as Mission 300, which aims to connect 300 million people in Africa to electricity by 2030.
UK Minister for Development Jenny Chapman said the strategy aligns with a broader change in how the UK approaches development.
“Over the past few months, I have been setting out the need for a new UK approach to development – one moving from traditional aid grants to long-term partnerships that bring investment, expertise and international finance reform together,” she said.
“BII sits right at the heart of this approach, and its new strategy is pulling in the same direction we have set as a Government. I know BII will lead from the front in turning our joint ambitions into genuine results over the next five years.”
In addition to sector-focused investments, BII plans to expand “market-level” interventions aimed at developing entire industries rather than supporting individual firms.
It will also strengthen its gender-focused investment strategy, with 30% of new investments expected to meet the criteria of the global 2X Challenge, which supports women’s economic participation.
The strategy comes at a time when development finance is under pressure, with declining aid flows and rising borrowing costs limiting access to funding across many African economies.