Embedded BESS Basic and Premium are two contract formulas for Yuso battery management.

  • Basic: With Embedded BESS Basic, volumes entering and leaving the battery in “Self-supply” mode are billed at Day-Ahead (DA) prices. Volumes entering and leaving the battery in “Overruling” mode are billed at imbalance (IB) prices⁠⁠.

  • Premium: With Embedded BESS Premium, all volumes entering and leaving the battery are billed at imbalance prices, regardless of the control mode⁠⁠. The Premium contract formula is standard for sites where multiple devices are controlled simultaneously.

More about Basic & Premium

Yuso has been using the Basic model for battery control up to now. This means that the imbalance effect of the battery in Selfsupply mode is absorbed by Yuso.

Why is there an imbalance effect in Selfsupply mode? This is how it works:

  • Yuso buys and sells the site's consumption and injection the day in advance in the Day Ahead market. This allows Yuso to settle every activation of the battery at 100% imbalance prices.

    • When the battery charges with solar energy from the site, this also has an effect on the imbalance position. This is because this energy would normally go to the grid. The Selfsupply mode therefore creates a shortage at that moment, and the imbalance cost at that moment is charged for that shortage.

    • When the battery discharges to the site, less energy is consumed than anticipated in the Day Ahead forecast for the site. The Selfsupply mode then creates a surplus. The imbalance cost at that moment is charged for that surplus.

In Embedded Basic mode, this effect is not passed on to the customer, but this electricity is charged at Day Ahead prices. In this way, Yuso absorbs the imbalance effects in Selfsupply mode itself. In the Premium model, the imbalance effect is passed on to the customer.

Why choose Embedded BESS Premium?

Yuso analyses show that Embedded Premium yields an additional 5 to 10% net benefit for the customer. This is because, in many cases, Selfsupply mode causes a deficit when imbalance prices are negative and a surplus when imbalance prices are positive. In the past, Yuso wanted to protect the customer from the imbalance effect in Selfsupply mode, but our analyses show that this is not necessary.

Are there any disadvantages to Embedded BESS Premium?

The advantage of the imbalance effects is also the disadvantage: when the imbalance price is high during a shortage, you as a customer will pay for this in the Embedded BESS Premium model.

Embedded BESS Premium is automatically applied to all customers who have multiple Flex contracts with Yuso, for example, both PV Curtailment and Battery Control.