What is the difference between using electricity yourself and selling it to the grid?

When you have solar panels on your roof, you produce your own electricity – but what happens when you produce more than you consume? Here, the choice is between two options: Use the electricity yourself (self-consumption) Sell the electricity to the grid Both have economic significance, but the difference between them can be greater than many think.

1. Self-consumption provides the greatest value

When you use the electricity directly in your home – e.g., for the washing machine, refrigerator, or charging an electric car – you save the full electricity price. This includes both the energy price, grid fees, and VAT. In 2025, the total electricity price is typically DKK 2.20–2.80/kWh. Example: If you use 5,000 kWh yourself, you save 5,000 x DKK 2.50 = DKK 12,500 annually

2. Electricity sales to the grid provide lower settlement

When you don't use the electricity yourself – typically in the middle of the day – you sell it to the grid. Here, you only get the energy price itself. In practice, this means you are settled at approx. DKK 0.80–1.20/kWh, depending on the electricity exchange prices, balancing agreement, and any broker (who takes a small commission). Example: If you sell 3,000 kWh to the grid at DKK 1.00/kWh, you earn DKK 3,000 annually

3. Battery and grid balancing: Optimization of both

With a battery and a grid balancing agreement (often via a third party), you can store the surplus electricity and use it in the evening or sell it at times when the electricity price is high. This can mean: More electricity used in the home (increased self-consumption from e.g., 30% to 65%) Sales to the grid during "expensive hours" → higher settlement Typical extra gain: DKK 3,000–5,000 annually

4. Economic significance in practice

Let's look at two examples with a 10 kWp solar panel system on a house with 8,000 kWh electricity consumption:

5. Conclusion: Use first, sell later

The more electricity you use yourself – or store with a battery – the greater your financial gain will be. Selling electricity is fine as a supplement, but it is self-consumption and intelligent control that really make the difference. 👉 At EcoRay, we help you find the right balance between self-consumption, battery solution, and sales strategy – based on your goals and your consumption pattern.