Mott MacDonald appointed on US$27 million Jamaican hydro expansion scheme

Mott MacDonald has been appointed as designer and technical advisor by Kier Construction Ltd¹ for a US$27 million hydropower expansion project located on the Black River near the town of Maggotty in Jamaica. The expansion will double the 6.3MW power capacity of the scheme.

The existing plant, which was constructed in the late 1950s, is made up of a weir and intake, 2.2km of 1.8m diameter woodstave pipeline, 100m of rock tunnel, a pipe bridge and surge tank, as well as an existing powerhouse with one vertical axis Francis turbine. The woodstave pipeline is in need of repair and replacement and this project provides an opportunity to incorporate the existing elements into an expanded scheme to add 6.3MW capacity.

The project will include the construction of a new intake to double the design flow, alteration of the existing weir, duelling of existing pipelines, replacement of the woodstave pipeline with 2.6m diameter glass-fibre reinforced polyester (GRP) pipe and a new powerhouse housing two horizontal axis Francis turbines. Several elements of the existing scheme will be re-used, including 220m of concrete conduit, the rock tunnel and surge tank, subject to condition assessments and detailed hydraulic modelling.

Mott MacDonald will design all scheme components including the new intake, retaining walls, pipeline and powerhouse, with added support during construction. The consultancy will also provide detailed hydraulic analysis and flood risk assessment for the expansion as well as technical advisory services for the electrical and mechanical elements.

Sustainability has been a key consideration in the design, with the re-use of existing scheme elements where possible and use of modern materials such as GRP to reduce the embodied carbon footprint.

Gavin McGill, Mott MacDonald’s project director, said: “Jamaica is highly dependent on oil imports to meet its energy requirements. It is currently making efforts to reduce its reliance on these, with hydropower presenting a clean and reliable alternative. The existing Maggotty hydro scheme forms an important part of the country’s generating capability and our off-line construction design will aim to keep disruption to power generation to a minimum during the construction period.”

“Mott MacDonald is pleased to be involved in developing this project from basic design through to construction based on our strong recent compact hydro experience,” Gavin added.

Construction is expected to start on the project late this year, with work due to be completed by the end of 2013.


Notes for editors

1) Kier Construction Ltd has been appointed on an engineering, procurement and construction contract by the Jamaica Public Service Co.

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About Mott MacDonald

Mott MacDonald is a global management, engineering and development consultancy with more than 14,000 staff, £1 billion revenue and work in 140 countries for the public and private sectors. For 6 consecutive years the employee-owned company has featured in the Sunday Times 25 Best Big Companies to Work For survey. Mott MacDonald’s core business sectors cover buildings, transport, energy, water, environment, health, education, industry, oil and gas, communications and international development.

More information can be found at


About Us

Mott MacDonald is a diverse £1 billion global management, engineering and development consultancy. As one of the world's largest employee-owned companies with nearly 15,000 staff, we have 168 offices in nearly 50 countries and projects in 140. We're engaged in public and private sector development across a broad range of sectors including transport, buildings, power, oil and gas, international development, urban development, industry, water, environment, education, health and communications. More information can be found at