Struct CapacityBlock 

pub struct CapacityBlock {
    pub leistung_kwp: Decimal,
    pub verguetungssatz_ct: Decimal,
    pub inbetriebnahme: Date,
    pub foerderendedatum: Date,
}

A single capacity block for §24 EEG Anlagenerweiterung (plant extension).

When an existing EEG plant is extended with additional capacity (e.g. adding 5 kWp to an existing 10 kWp installation), the extension receives its own:

• Feed-in tariff rate (the statutory rate at the extension date, which is typically lower due to annual degression)
• 20-year Förderdauer starting from the extension commissioning date

The settlement engine allocates the measured Einspeisemenge proportionally across all blocks by installed capacity (§24 Abs. 1 EEG 2023).

Zusammenlegung vs. Erweiterung

• Zusammenlegung (§24 EEG): two legally separate plants merged into one entity. Both plants contribute their original rates and end dates. Model via two CapacityBlocks.

• Erweiterung: capacity added to an existing plant at a later date. New capacity block gets current statutory rate from extension date. Model via one primary block (in SettleInput) + one CapacityBlock.

Example

use eeg_billing::CapacityBlock;
use rust_decimal::dec;
use time::macros::date;

// Original 10 kWp at 9.25 ct/kWh (EEG 2020)
let original = CapacityBlock {
    leistung_kwp:     dec!(10),
    verguetungssatz_ct: dec!(9.25),
    inbetriebnahme:   date!(2020-03-15),
    foerderendedatum: date!(2040-03-15),
};

// Extension: +5 kWp at 8.11 ct/kWh (EEG 2023)
let extension = CapacityBlock {
    leistung_kwp:     dec!(5),
    verguetungssatz_ct: dec!(8.11),
    inbetriebnahme:   date!(2024-06-01),
    foerderendedatum: date!(2044-06-01),
};

Fields

leistung_kwp: Decimal

Installed capacity for this block in kWp (or kW_el for KWKG).

verguetungssatz_ct: Decimal

EEG feed-in tariff rate for this block in ct/kWh.

Fixed at the commissioning date of this block for its full Förderdauer.

inbetriebnahme: Date

Commissioning date for this block (Inbetriebnahmedatum).

foerderendedatum: Date

Subsidy end date for this block (inbetriebnahme + 20 years).

When the billing period start date exceeds this, the block is expired and contributes EUR 0 (or EPEX spot price for PostEegSpot transition).

Trait Implementations

impl Clone for CapacityBlock

fn clone(&self) -> CapacityBlock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CapacityBlock

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

Formats the value using the given formatter.