"There has been an increased growth in demand (for solar), I think really driven by the spike in diesel prices this year," Victor Ezenwoko, Daystar Power chief commercial officer said.
The price of diesel, not subsidized like petrol, has nearly tripled to 800 naira a liter ($1.93). Most of that increase came in the wake of Russia's invasion of Ukraine.
The Energy Commission of Nigeria says the country spends $22 billion annually to fuel generators.
Solar power adoption is estimated at below 2% and some businesses perceive it as unsuitable for large-scale use, industry executives said.
A study earlier this year by Boston Consulting Group and All-On, a Shell-funded firm, said Nigeria's installed photovoltaic solar panel per capita amounted to 1 watt compared to an average 8 watts in similar emerging markets like South Africa.
That is changing as energy costs eat into company margins, forcing businesses to actively consider solar, a clean form of energy, said Prince Ojeabulu, CEO at Rensource Energy.
In 2021, Rensource installed under a megawatt of solar panels but it is now constructing 6 MW plants.
"By the end of the year, going by the trend that we see so far, we should have 12 MW of solar installations operational across Nigeria, or even more," he said.
A Ministry of Power official said there was an increase this year of approved solar mini grids serving industrial users but did not give details.
"We could install 60 MW this year if we had the equipment. We have even started turning down customers...we have become more choosy with whom we work (with)," said Daystar CEO and co-founder Jasper Graf von Hardenberg.
Supply constraints could, however, hamper their ability to capitalize on the trend, with some saying they have begun to turn away customers because they are unable to meet demand.
Local financing has been difficult to access too, executives said, but money is flowing in from overseas development financial institutions looking to invest in businesses focusing on green energy.
Demand has been so strong for Arnergy solar that it has done more connections in the first half of 2022 than the whole of last year, said Sinmi Akinsanmi, vice president for strategy and business operations.
Nigeria, Africa's largest economy with a population of more than 200 million people, has installed electricity capacity of 12,500 megawatts but the national grid only provides 4,000 MW at peak, leaving businesses and citizens heavily reliant on diesel-powered generators.