Enum RepoweringScope 

pub enum RepoweringScope {
    Full,
    RotorOnly,
    NacelleAndRotor,
    TurbineUnit,
    FullWithCapacityIncrease,
}

Scope of a repowering event — determines whether the 20-year Förderdauer resets.

Repowering is one of the most legally complex topics in the EEG. Whether the Förderdauer resets depends on what exactly was replaced.

§22 EEG 2023 — Key rule

The Förderdauer resets only for Vollrepowering (complete new plant at the same site). Partial component replacements do NOT reset the clock — the original commissioning date continues to govern.

Practical guidance

When in doubt, consult BNetzA guidance or a specialized EEG attorney. The distinction between RotorBlade, WholeNacelle, and TurbineUnit is fact-specific and the BNetzA has issued conflicting guidance in edge cases.

Variants

Full

Vollrepowering: Complete replacement of all generating components (generator, nacelle, rotor, tower, foundation).

Resets Förderdauer to the new commissioning date. Equivalent to a new plant at the same grid connection point. Uses foerderendedatum_repowering(new_commissioning_date).

RotorOnly

Teilrepowering — Rotor only: rotor blades and hub replaced, nacelle and generator unchanged.

Does NOT reset Förderdauer. Old commissioning date continues. Rotor replacement alone does not constitute “Inbetriebnahme” under §3 Nr. 30 EEG 2023.

NacelleAndRotor

Teilrepowering — Nacelle and rotor replaced, tower and foundation unchanged.

Legal status is contested (BNetzA has not issued definitive guidance). Conservative interpretation: Förderdauer does NOT reset (original date governs). Aggressive interpretation: may reset if generator output increases substantially.

TurbineUnit

Teilrepowering — Complete turbine unit replaced (generator + nacelle + rotor), but tower and foundation unchanged.

Legal status is contested. Most EEG specialists consider this a Vollrepowering (Förderdauer resets) when capacity increases significantly. BNetzA position: resets if the turbine is “technisch and wirtschaftlich neu.”

FullWithCapacityIncrease

Repowering with capacity increase — same classification as Full but explicitly tracks that the new plant has higher rated power than the original.

Relevant for Ausschreibungspflicht threshold check (§22 EEG 2023): the new capacity may push the plant above the 750 kW wind tender threshold.

Implementations

impl RepoweringScope

pub fn resets_foerderdauer_definitely(self) -> bool

Returns true when this repowering scope definitely resets the Förderdauer.

Returns false for contested cases — the caller must resolve the legal question before computing the new Förderdauer.

pub fn replaces_generating_unit(self) -> bool

Returns true when this scope involves replacing the nacelle or generating unit.

Rotor-only replacement never replaces the generating unit.

Trait Implementations

impl Clone for RepoweringScope

fn clone(&self) -> RepoweringScope

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RepoweringScope

impl Debug for RepoweringScope

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for RepoweringScope

impl Hash for RepoweringScope

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for RepoweringScope

fn eq(&self, other: &RepoweringScope) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for RepoweringScope