Flanders’ Capacity Tariff Turned Peak Demand into a Priced Asset

Flanders’ capacity tariff has been teaching households a lesson since 2023. The commercial and industrial version of that lesson is larger by orders of magnitude — and it is the clearest, most direct economic case for behind-the-meter storage in the region.

The mechanism, clause by clause. Since 1 January 2023, the Flemish grid operator prices part of the distribution network cost on peak draw rather than total consumption. The billing logic, per the Vlaamse Nutsregulator (VNR, formerly VREG), runs in three steps:

1. Quarter-hour power. Your digital meter records the energy drawn in each 15-minute interval; that interval’s power in kW equals its kWh multiplied by 4.
2. Monthly peak. For each month, the billed peak is the single highest 15-minute power draw of that month.
3. Annual charge. Your yearly capacity cost is the average of the last 12 monthly peaks (with a floor of 2.5 kW) multiplied by your network operator’s rate — approximately €53.39 per kW per year, excluding VAT, in 2026. (Source: Youpower — “Calculating the capacity tariff for businesses (2026)”, citing VNR; retrieved 2026-09-28.)

One qualification that decides your arithmetic. The three-step logic above applies to connections on the low-voltage grid. Businesses on the medium-voltage grid — which covers many larger C&I and industrial sites — are billed under a different formula. Before you size a peak-shaving asset, confirm which grid level your connection sits on and read the exact billing method from the VREG/VNR rules; do not carry the low-voltage arithmetic across that boundary.

Why this is a C&I problem, not a household problem. A household peak is measured in single-digit kW. For a site with a 2 MW peak — a mid-sized logistics or manufacturing facility — the same per-kW rate works out at roughly €107,000 a year at the 2026 rate (2,000 kW × €53.39/kW/yr). That is an illustrative example, not a typical value; your own figure follows from your measured peak profile in Mijn Fluvius. The point is the order of magnitude: a line item large enough to be its own budget, and one that a battery can directly reduce by shaving the peak.

The storage argument is arithmetic, not subsidy. A behind-the-meter battery that trims a site’s monthly peak earns a predictable, recurring saving — independent of energy-price volatility and independent of subsidy. Unlike a residential battery chasing dynamic-tariff spread, a C&I peak-shaving asset is sized against a defined, contractual grid cost. That makes its payback model something a facility manager and a CFO can both sign off on — and something a lender can underwrite.

What changed. The capacity tariff turned peak demand into a priced asset. The sites that treat their peak as a managed cost — with storage, load scheduling, or both — are pricing a 15-to-20-year grid-cost structure. The ones that don’t are paying for their peak every single month.

Last updated: 2026-09-28.

Updated for commercial and industrial readers, September 2026.