by Wale Yusuff, Wärtsilä, Nigeria
Nigeria is a major industrial hub. It is home to energy-intensive manufacturing businesses whose operations, and growth potential, are constrained by the weakness of the country’s electricity supply. To mitigate this, industrial companies have been building their own power generation capabilities, but the result has often been the reliance on expensive and polluting diesel generators. As such, the industrial sector represents one of the country’s largest sources of greenhouse gas emissions.
In most places in Africa, the development of renewable energy capacity is a very competitive solution that industrials can adopt to lower their environmental impact and energy costs. But things aren’t as clear-cut in Nigeria. Most of its industrial activity is in the south, a region where wind and solar resources are often not available in sufficient quantities to make renewables competitive at today’s equipment prices.
It leaves industrial firms with a twin challenge. First and foremost, they need to secure their own reliable and affordable power capacity either by buying electricity from an independent power producer or by building their own power plant. Secondly and at the same time, they need to integrate decarbonisation in their overall energy strategy.
Both objectives are not contradictory. By making smart technology choices, forward-looking businesses like BUA Cement, African Foundries, Lafarge, Wempco, Nestlè, and Flour Mills have found a way to overcome this twin challenge. Here is how.
To secure a reliable supply of electricity
Mitigating power generation risk is critical to Nigeria’s industrial growth. As one of the world’s largest producers of liquified natural gas (LNG), Nigeria has a strong interest to develop its utilization to power local industries.
That’s why flexible engine power plants have emerged as the technology of choice for Nigeria’s industries. Fuel-flexible engine technology provides a great hedge against fuel supply risk as it can operate on multiple types of fuels, from Gas to heavy or light fuel oil, and switch between fuels while operating. This fuel flexibility is also a key enabler to the decarbonisation strategy of industrials, as engine power plants can be converted to run on sustainable fuels like biofuels and green hydrogen, ammonia, or methanol when these become available.
Thanks to their modular design, Wärtsilä engine power plants are easy to construct, fully scalable and can be deployed in phases. They have the flexibility to be ramped up or down quickly to adjust to demand, they have a high operating efficiency even at partial load and are designed to cope with regular stops and starts. This very high operating flexibility is also what is needed for the future integration of intermittent renewable energy capacity to the power mix. What is more, they require much less water to function than competing power technologies, which is an important water conservation consideration in view of Nigeria’s long dry seasons.
With all these attributes, flexible engine power plants offer a cost-effective solution to meet energy demand in the short term, and environmental objectives in the longer term.
BUA Cement PLC, one of Nigeria’s largest cement producers, is one example of an energy-intensive industrial company that has invested to secure its own flexible and reliable power supply and decrease its carbon footprint. As the demand for cement is increasing every year, BUA has taken advantage of the modularity of engine technology to increase its power capacity in stages. The company is currently installing a 70 MW power plant for Line 4 in its Sokoto cement plant, in northwest Nigeria. This is in addition to a 50 MW power plant commissioned two years earlier for Line 3 of the same cement plant. Future expansion plans include another 70 MW for its OBU line 3 cement plant in Edo State in the southwest of the country by the end of 2023.
The plants feature Wärtsilä 34 DF dual-fuel engines operating primarily with LNG and PNG, but with the flexibility to switch to an alternative fuel should there be interruptions to the gas supply, quality, or pressure. What is more, the operational flexibility of the Wärtsilä engines provides future-proofing advantages by enabling the potential integration of renewable energy further down the line.
To prepare for renewables
Nigeria’s long-term energy strategy has defined the rapid deployment of renewables and strengthening the power transmission network as key objectives. But it must also overcome the specific challenges of the tropical monsoon climate in the industrialized south of the country where the solar and wind potential is respectively 30% and 40% lower than in the hot and semi-arid conditions in the north.
By investing in gas engine power plants, energy-intensive industries will not only decrease their carbon footprint, but they will also free up resources for the government to expand the transmission network enabling the entire country to benefit from the natural gas reserves located in the south and renewable resources in the north.
Paras Energy sets an example of how this can work. Since installing a 132 MW Wärtsilä gas engine power plant in Ikorodu in Lagos State and Ogijo in Ogun State, Paras Energy is supplying the company’s steel production needs as well as providing power to the Nigerian grid to support over 20 000 homes annually. The company is now commissioning a 10 MW solar power plant in Suleja and a 5 MW solar rooftop system for commercial and industrial customers is under development.
Flexible engine power plants represent a smart and future-proof investment for Nigeria’s energy-intensive industries. They offer the efficient power capabilities needed to offset the shortcomings of the national power grid, strengthen their global competitiveness, and reduce their GHG emissions today and tomorrow. By working towards the country’s decarbonization targets, the smart energy investments made by industry will benefit the whole country.
