Are battery energy storage systems worth the cost?

Battery Energy Storage Systems (BESS) are becoming essential in the shift towards renewable energy, providing solutions for grid stability, energy management, and power quality. However, understanding the costs associated with BESS is critical for anyone considering this technology, whether for a home, business, or utility scale.

What is a battery energy storage system (BESS)?

BESS stands for Battery Energy Storage Systems, which store energy generated from renewable sources like solar or wind. The stored energy can then be used when demand is high, ensuring a stable and reliable energy supply.

How many kWh can a battery store?

The available batteries can store between 3 and 20.5 kWh with 5 to 6 kW of power. As an indication, the average consumption of a household (in Brussels with 4 people) is 9.5 kWh/day. The batteries currently being manufactured are guaranteed to work for at least 10 years, even with intensive use.

Why is a Bess battery so expensive?

The battery is the heart of any BESS. The type of battery—whether lithium-ion, lead-acid, or flow batteries—significantly impacts the overall cost. Lithium-ion batteries are the most popular due to their high energy density, efficiency, and long life cycle. However, they are also more expensive than other types.

Will the cost of batteries fall in the future?

The cost of batteries may fall in the future... thanks to the development of the electric car. In fact, batteries with capacities that have fallen to 80% could be reused in our homes. According to the Blackrock Investment Institute, the price per kWh of batteries should fall to €420/kWh in 2025.

How much does a home battery weigh?

Home batteries can weigh over 120 kg. However, they can be installed in a service room or discreetly hung on the wall because their design makes them quite flat (about 15 cm against about 1 m high). And in the future?