THE COMPANIES MAKING MONEY FROM UNUSED ELECTRICITY
Electricity is difficult to store, expensive to waste, and sometimes produced when nobody needs it. Around the world, businesses are finding ways to turn surplus energy into an opportunity — from powering data centres to charging batteries and producing hydrogen.
1. WHEN ELECTRICITY BECOMES TOO CHEAP TO USE
Electricity has an unusual problem: supply and demand must remain balanced, but electricity generation does not always match consumption.
Solar panels can produce enormous amounts of power on sunny afternoons. Wind farms may generate more electricity than the grid can immediately absorb on windy nights. Meanwhile, demand may be relatively low.
When supply exceeds demand and transmission capacity is limited, electricity prices can fall dramatically. In some markets, wholesale prices can even become negative, meaning generators may effectively pay to supply electricity under certain market arrangements.
This creates an opportunity for companies that can consume electricity at the right time, store it for later, or convert it into something valuable.
Instead of treating every surplus as a problem, these businesses look for ways to use energy that might otherwise be curtailed — deliberately reduced or switched off because the grid cannot accommodate all the available generation.
The key is timing. Electricity that is nearly worthless at one moment can become valuable hours later, when demand rises and renewable generation falls.
2. BATTERY COMPANIES: BUY LOW, SELL HIGH
One of the clearest business models involves large battery installations connected to electricity grids.
Companies operating these systems can charge their batteries when electricity is cheap and discharge the stored energy when prices rise.
This strategy is known as energy arbitrage.
Imagine a battery operator purchasing electricity for €10 per megawatt-hour during a period of surplus solar generation. Later, when demand increases, the operator sells the stored electricity for €100 per megawatt-hour.
The price difference is €90 per megawatt-hour before accounting for energy losses, operating costs, network charges, and other expenses.
The operator may also earn money by providing services that help grid operators maintain a stable electricity supply.
The opportunity is attracting investment because battery storage can make renewable energy more useful. Instead of relying entirely on the moment electricity is generated, operators can shift some of that supply to the hours when it is most valuable.
However, the strategy is not guaranteed to work. Battery installations require substantial upfront investment, and profits depend on price fluctuations, market rules, equipment costs, and competition.
3. ENERGY TRADERS: MAKING MONEY FROM PRICE DIFFERENCES
Not every company needs to own a power station or a giant battery to participate in this market.
Electricity trading companies can help renewable generators sell their output at the most advantageous times, manage market risks, and coordinate energy storage.
For example, a company managing a portfolio of wind farms and batteries can use forecasting software to anticipate periods of oversupply.
It might charge batteries when wind generation is abundant, then sell electricity during periods of higher demand.
Specialized trading firms can also earn revenue by providing access to electricity markets and optimizing when storage assets charge and discharge.
The advantage comes from combining market knowledge, forecasting, and rapid decision-making.
But predicting electricity prices is difficult. Weather forecasts can change, demand can surprise the market, and prices can move sharply in either direction.
The companies that succeed are not simply buying cheap electricity. They are managing a complicated combination of timing, infrastructure, and financial risk.
4. DATA CENTRES: USING CHEAP ELECTRICITY TO POWER THE DIGITAL ECONOMY
Artificial intelligence, cloud computing, and online services require enormous amounts of electricity.
This creates an opportunity for data-centre operators to locate facilities near reliable, competitively priced power supplies.
Some computing tasks can also be shifted to different times or locations, allowing operators to take advantage of periods when renewable electricity is abundant.
For example, certain batch-processing jobs, simulations, or non-urgent computing workloads may be scheduled when power is cheaper, provided deadlines and technical requirements allow it.
However, a data centre cannot simply consume unlimited surplus electricity whenever prices fall. Servers need reliable power, cooling systems must operate continuously, and many computing tasks require immediate responses.
The real business opportunity is therefore not just finding cheap electricity. It is combining affordable energy, reliable infrastructure, and flexible computing demand.
As AI increases electricity consumption, this relationship between energy markets and computing businesses is becoming increasingly important.
5. GREEN HYDROGEN: TURNING ELECTRICITY INTO A DIFFERENT PRODUCT
Another approach is to use surplus electricity to produce hydrogen through electrolysis, a process that separates water into hydrogen and oxygen.
The hydrogen can then be stored and used in certain industrial processes, energy applications, or transportation systems.
This creates a potential way to convert electricity that is abundant at one moment into a product that can be used later.
For example, a hydrogen producer might operate its electrolyser more intensively when renewable electricity prices are low and reduce production when electricity becomes expensive.
But there is a major challenge: electrolysis consumes substantial amounts of electricity, and converting energy into hydrogen and then using it again involves losses.
Hydrogen production also requires expensive equipment, suitable infrastructure, and customers willing to purchase the finished product.
Consequently, cheap electricity alone does not guarantee a profitable hydrogen business. The producer must also secure competitive equipment, reliable demand, and an effective way to transport or use the hydrogen.
6. WHY THE OPPORTUNITY IS GROWING — AND WHAT COULD GO WRONG
As wind and solar generation expand, electricity markets can experience greater differences between periods of abundance and scarcity.
Battery storage is one response to this changing pattern. Developers invest in batteries to capture price differences and provide services to electricity networks.
But the opportunity contains a paradox.
If many companies install batteries and compete to buy cheap electricity, prices during surplus periods may rise. If they all sell stored electricity during peak periods, prices during those hours may fall.
In other words, the very success of the business model can reduce the price differences that make it profitable.
Companies must therefore consider more than the amount of renewable electricity available. They need to understand local market conditions, grid constraints, storage duration, and the possibility that competitors will reduce future returns.
The strongest businesses will likely be those that combine efficient technology with good forecasting, disciplined investment, and several sources of revenue rather than relying on one price pattern.
MAACAT PERSPECTIVE
Unused electricity reveals an interesting principle of business: value depends not only on what a resource is, but also on when and how it can be used.
Battery operators turn price differences into potential revenue. Energy traders optimize when electricity is bought and sold. Data centres can use flexible computing demand to take advantage of favourable power prices, while hydrogen producers explore ways to convert electricity into a storable industrial product.
None of these strategies guarantees profits, and not every surplus unit of electricity can be recovered economically. Infrastructure, efficiency, and market conditions matter.
The opportunity is not simply to make money from electricity that nobody wants. It is to build a business that can transform energy at the wrong time into something valuable at the right time.
