Load shifting and energy arbitrage with BESS: shifting consumption to the most favorable times

The price of electricity and the actual cost of supply are not constant throughout the day. At the same time, many industrial and commercial facilities experience high consumption during periods that do not always coincide with the most favorable hours. A BESS system allows managing this difference through load shifting and energy arbitrage strategies.

Load shifting, or load displacement, consists of transferring part of the energy consumed from one hour to another without necessarily modifying the operation of the installation. The battery is charged during the selected periods and delivers that energy later, thereby reducing the demand from the grid.

Difference compared to peak shaving

Although both applications can work together, they are not identical. Peak shaving limits the maximum power demand, while load shifting shifts energy between periods. A combined strategy can charge the battery during favorable hours, discharge it during expensive periods, and reserve enough power to avoid unexpected peaks.

What is energy arbitration?

Arbitrage takes advantage of price differences between different periods. The BESS can charge when electricity is cheaper and discharge when its cost is higher. The goal is not to generate energy, but to optimize the moment when it is purchased and used.

The operation can be based on hourly tariff pricing, market signals, consumption forecasts, available photovoltaic generation, or specific contractual conditions. An EMS analyzes these variables and establishes a charging and discharging program that must respect both the limits of the installation and the battery’s lifespan.

Main benefits

· Optimization of energy costs: allows you to reduce exposure to the higher priced periods, according to the tariff and the supply contract.

· Greater predictability: The programming of the BESS helps stabilize the electricity purchase profile.

· Utilization of renewable surpluses: The photovoltaic energy that is not consumed immediately can be reserved for later hours.

· Peak reduction: The strategy can be coordinated with power limits to smooth out the load curve.

 ·Operational flexibility: The program can be adapted to production shifts, working days, weekends, or seasonal variations.

What determines profitability?

The benefit depends on the real price differential, the losses during the loading and unloading cycle, regulated costs, the number of cycles, and the battery degradation. For this reason, it is not enough to compare the minimum and maximum price of a day. It is necessary to simulate the operation based on real data and consider the total cost of ownership.

It is also important to coordinate the arbitration with the rest of the applications. Charging the battery fully during a high price window could prevent it from responding later in the event of a peak demand or an outage on the network. The strategy should prioritize business objectives and reserve the appropriate charging state.

At Vector Energy, we analyze the consumption curve and the conditions of each installation to configure a BESS solution capable of intelligently displacing energy. The result is more flexible, planned, and efficient management of the electrical supply.

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