Examples
Real examples for the Claude Code skills of the mastr plugin, one per skill: a request,
the mastr commands the skill ran, and the answer Claude gave.
Every example ran against the live API on 15 September 2026 with mastr 0.0.4.
The data changes, so your results will differ; the ids and keys shown work for trying the
requests yourself. Long lists are shortened.
To try them, install the CLI and the plugin — see SKILLS.md.
Skills: mastr-filters · mastr-search · mastr-unit
mastr-filters
How do I filter MaStR for battery storage in operation in Brandenburg above 10 MW, biggest first?
mastr filters stromerzeugung --compact
mastr stromerzeugung --filter "Bundesland~eq~'1400'" --total
mastr stromerzeugung --filter "Bundesland~eq~'1400'~and~Energieträger~eq~'2496'" --total
mastr stromerzeugung --filter "Bundesland~eq~'1400'~and~Energieträger~eq~'2496'~and~Betriebs-Status~eq~'35'" --total
F="Bundesland~eq~'1400'~and~Energieträger~eq~'2496'~and~Betriebs-Status~eq~'35'~and~Speichertechnologie~eq~'524'"
mastr stromerzeugung --filter "$F" --total
mastr stromerzeugung --filter "$F~and~Bruttoleistung~gt~'10000'" --total # unfiltered: not a FilterName
mastr stromerzeugung --filter "$F~and~Bruttoleistung der Einheit~gte~'10000'" --total # 0: gte is not an operator
mastr stromerzeugung --filter "$F~and~Bruttoleistung der Einheit~gt~'10000'" --total
mastr stromerzeugung --filter "$F~and~Bruttoleistung der Einheit~gt~'10000'" --sort "Bruttoleistung der Einheit-desc" --page-size 3 --compact # 0 rows
mastr stromerzeugung --filter "$F~and~Bruttoleistung der Einheit~gt~'10000'" --sort "Bruttoleistung-desc" --page-size 15 --iso-dates --compact
The skill’s operator list has no “greater than”. gt works, but gte returns 0 without any
warning. Sorting by the FilterName returned 0 rows and the CLI’s stderr note. The sort key is the
record field Bruttoleistung.
Battery storage in operation in Brandenburg, > 10 MW, largest first
FilterName op Value meaning
Bundesland eq 1400 Brandenburg
Energieträger eq 2496 Speicher
Betriebs-Status eq 35 In Betrieb
Speichertechnologie eq 524 Batterie
Bruttoleistung der Einheit gt 10000 kW (number field; gt is strict)
--filter "Bundesland~eq~'1400'~and~Energieträger~eq~'2496'~and~Betriebs-Status~eq~'35'~and~Speichertechnologie~eq~'524'~and~Bruttoleistung der Einheit~gt~'10000'"
--sort "Bruttoleistung-desc"
Check with --total: 300,199 → 94,302 → 92,789 → 92,773 → 11 units
First rows: Big Battery Lausitz 66,000 kW (SEE905930139120, Spremberg, 2020-11-19)
BESS Kahsel 32,200 kW (SEE975222107571, 2026-07-27)
BESS Löwenberger Land II 22,500 kW (SEE937755233493, 2026-07-05)
Next step offered: hand the filter to mastr-search for the full 11-row list.
mastr-search
How much offshore wind is in operation in Germany right now, and which wind farms are the biggest?
mastr stromerzeugung --total
mastr stromerzeugung --filter "Energieträger~eq~'2497'" --total
mastr stromerzeugung --filter "Energieträger~eq~'2497'~and~Wind an Land oder auf See~eq~'889'" --total
mastr stromerzeugung --filter "Energieträger~eq~'2497'~and~Wind an Land oder auf See~eq~'889'~and~Betriebs-Status~eq~'35'" --total
mastr stromerzeugung --filter "Energieträger~eq~'2497'~and~Wind an Land oder auf See~eq~'889'~and~Betriebs-Status~eq~'31'" --total
mastr stromerzeugung --filter "Energieträger~eq~'2497'~and~Wind an Land oder auf See~eq~'889'~and~Betriebs-Status~eq~'35'" --sort "Bruttoleistung-desc" --page-size 2000 --iso-dates --compact
MaStR can’t sum capacity server-side. With 1,776 matches the skill fetched them all in one page
(7.3 MB) and summed Bruttoleistung locally, grouping by WindparkName.
Offshore wind in operation: 1,776 units, 11,013,743 kW gross ≈ 11.0 GW
North Sea 9.19 GW · Baltic Sea 1.83 GW
Register context: 9,458,587 generation units, 43,517 wind units, 1,909 offshore
(133 more offshore units "In Planung")
Largest wind farms (47 in total)
Borkum Riffgrund 3 83 units 958.6 MW Siemens Gamesa commissioned 2025-12-03 … 2026-08-17
EnBW He Dreiht 51 units 765.0 MW Vestas V236-15MW 2025-11-25 … 2026-08-21
Windpark Hohe See 71 units 521.9 MW Siemens 2019
Baltic Eagle 50 units 476.3 MW Vestas 2024
Borkum Riffgrund 2 56 units 464.8 MW MHI Vestas 2018
OWP Veja Mate 67 units 422.1 MW Siemens 2017
… 41 more
Added in 2026 so far: 98 units, 1,280.3 MW (EnBW He Dreiht, Borkum Riffgrund 3, NC 1)
Largest single units: 15,000 kW, e.g. SEE920051579655 (HD A1, EnBW He Dreiht)
Source: © Bundesnetzagentur – Marktstammdatenregister (DL-DE-BY-2.0)
mastr-unit
What does MaStR unit SEE920051579655 tell me?
mastr stromerzeugung --filter "MaStR-Nr. der Einheit~eq~'SEE920051579655'" --iso-dates --compact
One call with total: 1. The record has 118 fields; the skill read the populated ones. The grid
operator’s NetzbetreiberMaStRNummer arrives as an HTML link (<a href="/MaStR/Akteur/…">), so
it took the number from NetzbetreiberNamen instead.
HD A1 — offshore wind turbine, EnBW He Dreiht (SEE920051579655)
Status: In Betrieb (system status: Aktiviert)
Capacity: 15,000 kW gross = 15,000 kW net (15 MW)
Turbine: Vestas Deutschland GmbH V236-15MW, Horizontalläufer,
hub height 144.6 m, rotor diameter 236 m
Location: Ausschließliche Wirtschaftszone — "Nordsee; Gebiet nach dem
Flächenentwicklungsplan des BSH: N-7"; 54.358732 N, 6.197874 E
Dates: commissioned 2026-02-24, registered 2026-02-27, last updated 2026-09-11
Operator: EnBW He Dreiht GmbH ＆ Co. KG (ABR912332201010) — a company, not anonymised
Grid: TenneT TSO GmbH (SNB970033313272), Höchstspannung, Volleinspeisung
EEG: EEG961890773712, tender award BK6-17-001-07
Permit: SGE959647687634, Bundesamt für Seeschifffahrt und Hydrographie
Source: © Bundesnetzagentur – Marktstammdatenregister (DL-DE-BY-2.0)
Next steps offered: the rest of the wind farm (--filter "Name des Windparks~eq~'EnBW He Dreiht'" matches 64 units, 51 of them in operation), or the linked EEG record.