CO2 Savings with a Batería doméstica: Your Contribution to the Climate

The climate impact of a batería doméstica

Paneles solares are already a major step towards a lower huella de carbono — but they only reach their full climate potential in combination with a batería doméstica. Without a battery, a large portion of solar power is lost or exported to the grid at a low tariff. With a battery, you use that green electricity yourself, meaning you need less fossil grid electricity.

In this article, we calculate exactly how much CO2 a batería doméstica saves, how quickly those savings offset the production emissions of the battery itself, and why every kWh of your own solar power counts for the climate.

How do you calculate your CO2 savings?

The CO2 emission from Dutch grid electricity varies by hour, but averages approximately 270–340 grams of CO2 per kWh (2025 figure, including imports). This is the so-called grid emission factor. Every kWh you draw from the grid emits on average that amount of CO2.

Emission factor of the Dutch grid

A large portion of the electricity that paneles solares export to the grid is lost through transmission losses (approximately 5–8%). A batería doméstica minimises this by storing the electricity locally and consuming it on-site — more efficient for both the grid and the climate.

Less export = less loss

You can calculate the CO2 savings por año as follows: avoided grid consumption (kWh) × grid emission factor (kg CO2/kWh) = CO2 savings (kg). For a system that saves 2,500 kWh por año from the grid with an emission factor of 0.3 kg/kWh: 2,500 × 0.3 = 750 kg CO2 por año.

Concrete CO2 figures by battery size

Below are the calculated annual CO2 savings for three popular battery sizes, combined with an average solar system:

A 10 kWh battery saves over its 15-year vida útil more than 11 tonnes of CO2 — equivalent to not taking the Amsterdam–New York flight 4 times.

How the batería doméstica strengthens the green energy system

A batería doméstica has a positive effect on the entire energy system:

• Grid balancing: batteries buffer the variable production from wind and solar, meaning fewer gas-fired power stations need to run as backup
• Recorte de picos: during moments of high demand, the battery can discharge instead of a gas-fired power station starting up
• Transmission loss reduction: storing and consuming locally limits transmission losses in the grid
• Green charging profile: smart charging during periods of high wind and energía solar increases the green share of your consumption
• Sector coupling: in combination with a bomba de calor or cargador de VE, the battery also leads to CO2 reduction in other sectors

Período de amortización for the climate: carbon payback

Over the battery's vida útil, it performs well above break-even for the climate:

An average 10 kWh batería doméstica has a production footprint of approximately 1,200–1,500 kg CO2 (material extraction, production, transport). With annual savings of 750 kg CO2, the carbon payback time is less than 2 years. The remaining 13+ years are entirely climate-positive.

Conclusion: small investment, big climate impact

The batería doméstica is one of the most cost-effective measures for consumers to structurally reduce their emisiones de CO2. Compared to other green investments such as bomba de calors or insulation, a battery offers a combination of financial and climate returns that is unique.

At Home Energy Solutions, we exclusively supply batteries that meet strict sustainability requirements. We are transparent about the production footprint and help you calculate the climate impact of your investment.