The Value of Energy Flexibility: Why Batteries, Solar, and Flexible Consumption Should Be Managed Together?

In energy management, asking only “How much energy are we consuming?” is no longer enough. As electricity prices fluctuate throughout the day, solar generation is concentrated in certain hours, and batteries and electric vehicles become increasingly widespread, another question is becoming just as important:

When should we use energy?

This question lies at the heart of energy optimization. Even if a business’s total energy demand remains the same, changing the timing of consumption or storage can create significant economic value.

Can costs be reduced without reducing energy consumption?

Yes.

Imagine a business that requires 100 kWh of energy during the day. After optimization, total consumption may still remain at 100 kWh. However, if part of that consumption can be shifted from high-price hours to lower-price hours, the total cost can decrease.

In other words, the goal of energy optimization is not always to consume less energy.

Sometimes, the real value comes from using the same amount of energy at a better time.

This is where the concept of energy flexibility comes into play. Energy flexibility is the ability to shift a consumption pattern or energy flow to different time periods, within certain limits, without disrupting operations.

The real value of a battery is its ability to move energy through time

A battery does not produce energy. However, it can change when energy is used.

In the simplest scenario:

Low-price period → Charge the battery → High-price period → Use the battery

When considered together with solar energy, the battery can take on another important role.

A facility’s PV system may generate large amounts of energy around midday, while a significant portion of consumption occurs in the evening. In that case, solar generation and energy demand do not occur at the same time.

A battery can connect these two periods:

Daytime solar generation → Storage → Evening consumption

For this reason, the value of a battery comes not only from its capacity, but also from when and for what purpose it is used.

So how much savings are possible?

There is no single percentage that applies to everyone.

The savings potential depends on:

- price differences throughout the day,

- how flexible the consumption profile is,

- battery capacity and power,

- solar generation,

- charging and discharging losses,

- electricity purchasing and selling conditions.

Double-digit cost advantages are frequently observed in the literature and in various optimization studies, while scenarios with large price spreads and sufficient flexibility can sometimes produce results approaching 50%.

However, there is an important distinction here:

“Up to 50% savings may be possible” is not the same as “every facility will achieve 50% savings.”

The true potential can only be determined by evaluating the facility’s own consumption profile, tariff structure and energy assets together.

We observe the same fundamental behavior in FlexyWatt’s optimization development work. Even when total energy demand does not necessarily decrease, the timing of energy use and the coordination of different energy assets can significantly change the economic outcome. In FlexyWatt’s new “Site Energy” approach, the grid, fixed loads, PV, batteries, EVs and other flexible loads are evaluated together as part of the same energy system.

Is a battery enough on its own?

Not always.

A facility may have solar generation, batteries, electric vehicles, HVAC systems and different flexible loads at the same time.

For example, when solar generation is high around midday and electricity prices are low, the system may have several options:

Should the battery be charged? Should the EV be charged? Should a flexible process be shifted to this period? Should excess energy be exported to the grid?

Each of these decisions may appear reasonable on its own.

However, because they all use the same electrical infrastructure, they affect one another. A decision that is beneficial for one asset may eliminate a more valuable opportunity for another.

That is why the real value in energy optimization comes from managing assets together as a system, rather than optimizing each one independently.

Flexible loads can also act as a form of energy resource

Energy flexibility does not come only from batteries.

Electric vehicles are a good example. If a vehicle needs to receive a certain amount of energy overnight, what usually matters most to the user is that the vehicle is ready by morning.

The exact hour at which charging takes place can often be shifted within certain limits.

Similarly, HVAC systems, pumps or certain industrial processes may also be shifted to different time periods under suitable conditions.

There is an important difference here:

A battery moves energy between different points in time.

A flexible load changes the timing of energy demand.

Both provide the optimization system with the same valuable thing: room to maneuver.

Does a larger battery always mean greater savings?

No.

As battery capacity increases, theoretical flexibility also increases. However, if there is not enough price spread, excess solar generation or a suitable consumption profile to make use of that capacity, a significant portion of the battery may remain economically underutilized.

For this reason, the right question is not only:

“How many kWh of battery capacity do I need?”

but also:

“What energy opportunity will I use this battery to capture?”

This is precisely one of the important use cases of energy optimization: not only managing existing assets, but also understanding where additional flexibility can create economic value.

The future of energy management

Energy systems are becoming increasingly distributed and dynamic.

As solar panels, batteries, electric vehicles and flexible loads become more common, energy management is also moving away from a traditional monitoring approach toward a more active model:

Measure → Forecast → Optimize → Apply → Measure the Result

In the future, what will differentiate businesses will not only be how many energy assets they own, but how intelligently and coordinately they are able to manage them.

Conclusion

A battery, solar energy system or electric vehicle is not an energy strategy on its own.

The real value emerges from how these assets are managed together.

This is also the fundamental purpose of energy optimization:

Using the right energy, at the right time, in the right asset.

When sufficient energy flexibility and suitable market conditions come together, significant cost advantages can be achieved. In some scenarios, this potential can approach 50%. However, actual savings should always be evaluated based on the facility’s own energy profile and operational conditions.