Changes in version 2.0.0                        

New functions

  - slp_electricity() is the new primary function for generating
    electricity standard load profiles. It replaces slp_generate() with
    a cleaner interface: no state_code argument and no restriction on
    the date range (previously limited to 1990–2073 by the built-in
    holiday data).

  - Nationwide German public holidays are now computed on the fly via
    the Anonymous Gregorian Easter algorithm rather than looked up in a
    precomputed table. Coverage is open-ended from 1990 onward (the year
    German Unity Day was introduced); the previous 2073 / 2099 caps no
    longer apply. State-level holidays are no longer included; use the
    holidays argument to supply custom dates.

  - slp_gas() implements the BDEW/VKU/GEODE synthetic procedure for gas
    standard load profiles (SigLinDe method). It supports all 15 gas
    profile IDs defined in the BDEW Leitfaden, as of 2025-10-28 (HEF,
    HMF, HKO, GKO, GHA, GMK, GBD, GBH, GWA, GGA, GBA, GGB, GPD, GMF,
    GHD). The function takes daily temperatures and a kundenwert
    (customer value, kWh/day), and returns daily gas consumption in kWh.
    The Kundenwert is a required input, derived once from a full
    reference year with slp_gas_kundenwert(). A variant argument selects
    between SigLinDe Ausprägung "34" (default, 57 % linear component)
    and "33" (45 % linear component).

  - slp_gas_kundenwert() derives the Kundenwert from a full reference
    year of daily temperatures and an annual consumption target. You
    might use this in a two-step workflow: compute KW once from a
    representative year, then pass the result as kundenwert to slp_gas()
    for any shorter period. Daily mean temperatures can be obtained from
    the DWD open-data archive, e.g. via the rdwd package; see the
    Kundenwert article on the package website for a complete
    fetch-to-profile walkthrough.

  - slp_gas_siglinde() exposes the low-level dimensionless daily heating
    demand function h(θ) used internally by slp_gas(). It is exported so
    that users with custom or region-specific coefficients (e.g.
    state-level parameters such as BW_HEF03 for Baden-Württemberg) can
    compute h(θ) directly and build their own profiles.

  - slp_gas_coefficients() returns the SigLinDe profile function
    coefficients (A, B, C, D, θ₀, mH, bH, mW, bW) for one or more gas
    profiles as a data frame. Defaults to all 15 profiles. Supports both
    variants ("34", "33").

  - slp_gas_weekday_factors() returns the weekday scaling factors (F_WT)
    for one or more gas profiles as a tidy data frame with columns
    profile_id, day, and f_wt. Defaults to all 15 profiles.

  - slp_info() now accepts gas profile IDs (HEF, HMF, HKO, etc.) in
    addition to electricity IDs, and respects the language argument for
    both. Electricity and gas IDs can be mixed freely in a single call.

Deprecations

  - The dataset slp has been renamed to slp_electricity_profiles. The
    old name still works (with a deprecation warning) but will be
    removed in a future release.

Superseded

  - slp_generate() is now superseded in favour of slp_electricity(). It
    remains in the package and will not be removed for now, but new code
    should use slp_electricity() instead.

Breaking changes

  - Passing state_code to slp_generate() now throws an error (previously
    a warning since version 1.1.0). Use the holidays argument of
    slp_electricity() to supply custom holiday dates.

                 Changes in version 1.1.0 (2026-03-16)                  

New profiles

  - Added five new standard load profiles published by BDEW in 2025: H25
    (household), G25 (commercial), L25 (agriculture), P25 (combination
    profile with photovoltaics), and S25 (combination profile with
    storage and photovoltaics). All five are available via
    slp_generate() and slp_info(), and are included in the slp dataset.

New features

  - slp_generate() gains a holidays argument: a character or Date vector
    of ISO 8601 dates that are treated as public holidays (mapped to
    "sunday" in the algorithm). When supplied, the built-in holiday data
    are ignored entirely, giving callers full control over which dates
    count as holidays.

Deprecations

  - The state_code argument of slp_generate() is deprecated. Pass a
    vector of holiday dates to the new holidays argument instead (#3).

Bug fixes

  - Fixed incorrect weekday assignment when a date range contains a
    Dec 24 or Dec 31 that falls on a Sunday. The previous check used
    all() across the entire range, which caused every other Dec 24/31 in
    the range to be mapped to "workday" instead of "saturday" (#2).

                 Changes in version 1.0.0 (2023-12-11)                  

  - Initial CRAN release