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EMS vs. Aggregator: Smart two-level energy management
The energy market is all about efficiency and profitability. Two technologies play a key role in this: energy management systems (EMS) and aggregators. Although closely related, they have different functions.
An EMS optimizes energy use and storage within a business or home. An aggregator bundles multiple EMS systems and collectively trades the generated energy on the market. Together, they maximize cost savings and grid stability.
What is an EMS?
An Energy Management System (EMS) is software that automates local energy management. It controls when and how a battery is charged and discharged, how solar energy is best utilized, and reducing peak consumption to save costs. With an EMS, you get more from your renewable energy and reduce energy costs without manual intervention.
What is an aggregator?
An aggregator operates at a larger level, bundling different energy sources (such as batteries and EVs) to strategically deploy them in the energy market. The benefits are that energy is traded on the Day-Ahead, Intraday and Imbalance markets, peak loads are reduced and additional revenue can be generated by selling flexibility to the grid. Aggregators help companies and households actively participate in the energy market without complex contracts or manual control.
What is the difference between an aggregator and an EMS?
| Feature | Aggregator | EMS (energy management system) |
|---|---|---|
| Purpose | Optimizes energy trading and balance at the grid level | Manages and optimizes on-site energy consumption |
| Scale level | External – controls multiple systems (batteries, solar farms, industry) | Internal – manages a single system (company, factory, household) |
| Market Interaction | Trades on the Day-Ahead, Intraday and Imbalance markets | Operates locally and can implement energy optimization based on market prices |
| Leveraging flexibility | Combines multiple energy sources to act collectively in the energy market | Saves costs by better matching supply and demand locally |
| Example use | Smart control of solar farms and industrial batteries to maximize revenues | Optimizing self-consumption, reducing peak consumption, smart battery charging |
How do EMS and aggregators work together?
An EMS can optimize energy on its own, but when combined with an aggregator, it becomes a profitable system.
Example:
An EMS allows a battery to be charged with solar energy during the day and discharged at night to reduce peak consumption. An aggregator can deploy that same battery in a virtual power plant (VPP) and have it trade on the imbalance market for additional revenue. This synergy allows businesses and households to not only save on their energy bills, but also make money from energy trading.
Curtailment: smart use of excess energy
Curtailment means temporarily scaling back energy production (such as solar or wind power) to avoid overloading the grid or negative energy prices. This happens in three scenarios:
Preventing grid congestion – Too much power on the grid? Then production is reduced to ensure stability.
Avoiding negative energy prices – When energy prices fall below zero, it may be more financially beneficial to temporarily generate less power.
Smart storage and use – EMS and batteries store excess energy instead of letting it go to waste.
Without a battery, renewable energy goes to waste. With smart storage, curtailment can be turned into a profitable model.
ZMission Energy Integrators: From A to Z Settled
Want smart energy management without the hassle? ZMission Energy Integrators takes care of everything:
We link your EMS to a suitable aggregator.
We ensure flawless setup of your EMS.
We guide you through every step, from installation to participation in the energy market.
Maximize your returns and contact us today!
