AgNes calculator: your grid fees and your battery from 2029

On 1 January 2029 (point 1.2 of the draft). The Bundesnetzagentur plans to adopt the final rules at the end of 2026, with follow-up rules in 2027. Grid operators publish their prices by 15 October each year (point 14.4), so the first AgNes prices arrive by 15 October 2028.

Every site connected above low voltage, and low-voltage sites that draw more than 100,000 kWh a year (point 8.4). Smaller low-voltage sites pay a basic price and an energy price (point 8.2).

Once a year, after your grid operator publishes its prices and before the year starts, you tell it how many kW you book, and you pay the capacity price on that. The booking is at least 10% of last year's peak and at most your connection capacity. If you book nothing, the operator derives a booking from your load data (point 8.4).

Only the energy drawn above the booking pays the higher AP2, which is 2 to 3.5 times AP1 (point 8.5). Unlike today's Leistungspreis, one bad quarter-hour does not set the price for the whole year.

Today's grid-fee rules end with 2028. Atypical grid usage continues until the end of 2031 only for sites that hold an agreement at the end of 2028, qualified at least once in 2026 to 2028 and drew more than 10 GWh a year on average in 2024 to 2027. Their discount is frozen at its 2024 to 2027 average (point 17.1). Existing agreements for continuous high use (7,000 hours) also run to the end of 2031 (point 17.2).

Peak shaving is worth less, because going over the booking only costs the AP2 surcharge on the energy above it, not a year of Leistungspreis on one peak. Most of a battery's money then comes from how it is run: moving energy into cheap hours and trading on the intraday and balancing markets, which AgNes leaves alone. That is the part our system earns; the calculator above shows it for your site.

It will run most of its life under AgNes, so the way it is run has to work under both sets of rules: today it earns most by capping the yearly peak, from 2029 by trading around a booking. The draft also sets a date: storage keeps the grid-fee exemption of § 118 (6) EnWG only if its final investment decision is made before the AgNes rules are announced, expected at the end of 2026, and the owner proves this to the grid operator by 31 March 2027 (point 17.5). The other conditions of § 118 (6), such as starting operation by 4 August 2029, still apply.

A battery on your site pays no energy price on energy it draws from the grid and feeds back, as long as those amounts can be metered separately (point 10.2). Batteries get time-varying grid fees from 2030 at the earliest and 2033 at the latest (point 12.2).

No. They are our estimate from your current grid prices and the ranges in the draft. The real prices come from your grid operator by 15 October 2028, and the draft can still change before it is adopted.

No. Your browser reads the file on your device and it is never sent to us or anyone else. If you want an exact calculation, leave your email above and send us the file when we reply.