Brazil, Bitcoin & Batteries: Why ENGIE is Exploring Crypto

When ENGIE's Assu Sol solar plant in northeast Brazil switched on for the first time this month, it marked a real milestone for the French energy firm.

With an eye-watering peak capacity of 895MW, it is by far the largest solar project in ENGIE's global portfolio.

The fanfare, however, has been short-lived.

Almost immediately, Assu Sol ran into one of the most frustrating problems in renewable energy today: curtailment.

Curtailment refers to periods when grid operator instruct energy providers to altogether stop generating power, not because something has gone wrong, but because the grid simply cannot absorb what is being producing.

This oversaturation ultimately wastes potential profits for companies like ENGIE.

Brazil's renewable growing pains

The issue is not unique to ENGIE, nor to Assu Sol.

Since 2023, curtailment has become a real headache for solar and wind operators across Brazil, costing the sector millions in lost revenue.

The equation is simple: when a surge of new renewable capacity meets a stalling growth in demand and ageing infrastructure, energy is bound to be wasted.

The result is a paradox familiar to energy markets the world over: the greener the grid becomes, the harder it can sometimes be to make green energy pay.

For Eduardo Sattamini, ENGIE's Country Manager for Brazil, the question is what to do about it.

Enter bitcoin

Speaking to journalists on a call last week, Eduardo said the company is now evaluating potential "offtakers" – industrial energy consumers that could be installed directly at Assu Sol to absorb the excess power that the grid refuses to take.

Two options are on the table: battery storage systems and bitcoin mining data centres.

"We are looking at some possible offtakers," he said.

The appeal of bitcoin mining, in this context, has less to do with cryptocurrency than with physics.

Mining rigs are one of the few industrial loads that can be switched on and off almost at the drop of a hat, making them uniquely suited to mopping up the variable surpluses that solar plants produce. That power, of course, would otherwise go to waste.

Brazil's policy environment has also tilted in favour of bitcoin miners in recent weeks.

Just days before ENGIE's announcement, the country's foreign trade council slashed import duties to zero on high-efficiency mining hardware, with the exemption running until January 2028.

That tariff window could meaningfully reduce the upfront cost of any mining infrastructure ENGIE eventually chooses to deploy.

Eduardo was careful, though, not to oversell the timeline.

"That's not coming next month," he said. "It will take a couple of years for us to implement."

An industry in transition

Should ENGIE indeed pivot towards bitcoin mining, the firm would be bucking broader industry trends. Right now, many established players in the crypto world shifting away from it altogether.

With block subsidies trending towards zero and margins tightening, miners are increasingly repurposing their digital infrastructure for AI workloads, where contracted revenues from AI firms offer more predictability than crypto ever could.

Bitfarms, for instance, is winding down its bitcoin operations over the next couples of years and is planning to convert its Washington State facility into an standard AI data centre.

Elsewhere, IREN has locked in some multi-billion-dollar GPU cloud agreements with partners like Microsoft, while Bitdeer Technologies has liquidated its entire bitcoin treasury.

The bigger picture

For ENGIE, however, the latest cryptocurrency trends may not actually matter so much.

The company is not a crypto operator, nor is it making a bet on bitcoin's price. It is simply searching for a load, any load, that can turn curtailed megawatt-hours into something bankable.

Whether that turns out to be mining rigs, battery arrays or a combination of the two is a question that could take years to answer.

What is already clear, though, is that the economics of large-scale renewables in Brazil are under a fair deal of strain that will likely require some systemic fixes.

Until that time, cryptocurrency could be a useful lifeline for firms like ENGIE.