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arxiv: 2605.15958 · v1 · pith:CBL5RDXPnew · submitted 2026-05-15 · ⚛️ physics.ao-ph · cs.CY· physics.soc-ph

Bridging the climate to energy data gap: simulated annealing for representative climate year selection

Pith reviewed 2026-05-19 18:12 UTC · model grok-4.3

classification ⚛️ physics.ao-ph cs.CYphysics.soc-ph
keywords simulated annealingrepresentative climate yearsenergy system modelssliced Wasserstein distanceclimate ensemble selectionoptimal transportpower system planningclimate data gap
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The pith

Simulated annealing selects better climate year subsets for energy models

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper tries to establish that simulated annealing can be used to choose small groups of climate years that accurately represent a much larger set of years for use in energy system models. This matters because energy models are limited in the number of years they can process, and poor choices can lead to biased results in planning for power systems. The method uses an optimization technique with a specific distance measure to find the best subsets and shows it works better than other approaches in tests for the Netherlands and Europe. If true, it would allow for more reliable climate inputs without extra computation.

Core claim

This study proposes simulated annealing as an optimisation method for selecting representative subsets of complete climate years from large climate ensembles. Representativeness is quantified using the seasonal sliced Wasserstein distance, a metric from optimal transport theory that captures representativeness on marginal distributions, inter-variable correlations, and seasonal structure simultaneously. We evaluate simulated annealing against the alternative methods random search, filtered random search, and K-Medoids clustering across three test cases spanning the Netherlands and Europe, using 180 climate years from the Pan-European Climate Database as a reference. Simulated annealing cons

What carries the argument

Simulated annealing optimization that minimizes the seasonal sliced Wasserstein distance between the selected subset and the full climate ensemble to achieve representativeness across multiple statistical properties.

If this is right

  • Simulated annealing outperforms random search, filtered random search, and K-Medoids clustering in producing representative climate year subsets.
  • The method achieves an effective sample size four to five times the actual subset size.
  • Subsets are 2.5 to 3.5 times more representative than current ENTSO-E practice.
  • The output serves as validated climate data input for any energy impact study.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Adopting this could lead to better informed energy investment decisions by capturing a wider range of weather conditions.
  • The approach might be adapted for selecting representative days or months instead of full years in other modeling contexts.
  • Direct validation with energy model runs would test if the distance metric predicts real-world impacts accurately.
  • This technique could apply to climate data selection in fields like agriculture or water management.

Load-bearing premise

Assuming that a small set of climate years matching the full set on weather distributions, variable correlations, and seasonal patterns will produce similar results in energy system models is the main premise.

What would settle it

If energy system models run with the selected years do not show better matching to full-ensemble results than current practice selections, the advantage would not hold.

read the original abstract

Energy system models are increasingly dependent on representative climate input. Yet, a fundamental mismatch persists between the hundreds of simulated years often used in climate science and the handful of years that computationally demanding power system models can process. Current practice, including ENTSO-E's European Resource Adequacy Assessment, relies on climate year selections that have not been validated against explicit representativeness criteria. This risks biased investment decisions and blind spots for plausible weather conditions. This study proposes simulated annealing as an optimisation method for selecting representative subsets of complete climate years from large climate ensembles. Representativeness is quantified using the seasonal sliced Wasserstein distance, a metric from optimal transport theory that captures representativeness on marginal distributions, inter-variable correlations, and seasonal structure simultaneously. We evaluate simulated annealing against the alternative methods random search, filtered random search, and K-Medoids clustering across three test cases spanning the Netherlands and Europe, using 180 climate years from the Pan-European Climate Database as a reference. Simulated annealing consistently produces the most representative subsets and outperforms all compared methods. Simulated annealing achieves an effective sample size four to five times the actual subset size. The resulting subsets are roughly 2.5--3.5 times more representative than current ENTSO-E practice. The method is application-agnostic and its output can serve as a validated climate data input to any subsequent (energy) impact study.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript proposes simulated annealing to select representative subsets of complete climate years from large ensembles (e.g., 180 years from the Pan-European Climate Database) for use in energy system models. Representativeness is defined and quantified via the seasonal sliced Wasserstein distance, which incorporates marginal distributions, inter-variable correlations, and seasonal structure. The method is tested against random search, filtered random search, and K-Medoids clustering on three cases spanning the Netherlands and Europe; the paper reports that simulated annealing consistently yields the most representative subsets, with effective sample sizes 4–5 times the subset size and subsets 2.5–3.5 times more representative than ENTSO-E practice.

Significance. If the chosen metric proves a reliable proxy, the work supplies a systematic, optimization-based alternative to current ad-hoc or clustering-based climate-year selections, directly addressing the computational gap between climate ensembles and energy models. The comparison against multiple independent baselines and the application-agnostic framing are positive features that could support broader adoption in impact studies.

major comments (2)
  1. [Abstract] Abstract: The central performance claims (effective sample size 4–5× subset size; 2.5–3.5× improvement over ENTSO-E) rest exclusively on the seasonal sliced Wasserstein distance serving as both the optimization objective and the sole evaluation criterion. No experiment is described that inserts the selected subsets into an energy-system model and verifies that key outputs (LOLE, total system cost, or capacity requirements) are closer to the full-ensemble statistics than those obtained from ENTSO-E or K-Medoids selections. Because the metric is both the target and the judge, superiority on the proxy does not automatically establish superiority for the stated downstream use case.
  2. [Methods/Results] Methods/Results: The manuscript does not report error bars, run-to-run variability, or sensitivity tests with respect to the annealing schedule parameters or the sliced-Wasserstein hyperparameters (number of slices, seasonal partitioning). These omissions make it difficult to assess whether the reported outperformance is robust or could be altered by modest changes in the metric definition.
minor comments (2)
  1. [Abstract] The abstract and introduction would benefit from a concise statement of how the effective sample size is formally defined and computed from the Wasserstein distances.
  2. [Introduction] A short discussion of how the seasonal sliced Wasserstein distance relates to (or differs from) other representativeness metrics already used in the energy-climate literature would help readers place the contribution.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive and detailed review. We address each major comment below and indicate the revisions we will make to improve the manuscript.

read point-by-point responses
  1. Referee: The central performance claims (effective sample size 4–5× subset size; 2.5–3.5× improvement over ENTSO-E) rest exclusively on the seasonal sliced Wasserstein distance serving as both the optimization objective and the sole evaluation criterion. No experiment is described that inserts the selected subsets into an energy-system model and verifies that key outputs (LOLE, total system cost, or capacity requirements) are closer to the full-ensemble statistics than those obtained from ENTSO-E or K-Medoids selections. Because the metric is both the target and the judge, superiority on the proxy does not automatically establish superiority for the stated downstream use case.

    Authors: We agree that the evaluation is performed using the same metric employed in the optimization objective. The seasonal sliced Wasserstein distance was chosen specifically because it jointly accounts for marginal distributions, inter-variable correlations, and seasonal structure—properties we consider directly relevant to energy-system performance. The manuscript presents the method as application-agnostic, supplying representative year subsets that any subsequent energy impact study can adopt. We acknowledge that this does not constitute direct verification of improved LOLE, costs, or capacity outcomes. In revision we will add a discussion paragraph justifying the metric as a proxy and explicitly state that end-to-end validation in a full energy-system model remains future work; we will also moderate the abstract wording to avoid implying such validation has been performed. revision: partial

  2. Referee: The manuscript does not report error bars, run-to-run variability, or sensitivity tests with respect to the annealing schedule parameters or the sliced-Wasserstein hyperparameters (number of slices, seasonal partitioning). These omissions make it difficult to assess whether the reported outperformance is robust or could be altered by modest changes in the metric definition.

    Authors: We accept this observation. The revised manuscript will report standard deviations and error bars obtained from at least ten independent runs of simulated annealing for each test case. We will also add a sensitivity section that varies the number of slices (e.g., 10, 50, 100) and the seasonal partitioning scheme, showing that the relative ranking of methods remains stable under these changes. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation uses external metric and independent baselines

full rationale

The paper defines representativeness using the seasonal sliced Wasserstein distance from optimal transport theory as an external proxy capturing marginals, correlations, and seasonality. It applies simulated annealing to minimize this metric and evaluates the resulting subsets against independent methods (random search, filtered random search, K-Medoids) and ENTSO-E practice using the identical metric on the 180-year Pan-European Climate Database. No equations reduce reported improvements (e.g., effective sample size or 2.5–3.5× better representativeness) to a fitted parameter or input by construction, and no load-bearing self-citations or uniqueness theorems are invoked. The central claims rest on empirical optimization performance and external benchmarks, rendering the derivation self-contained against the stated criteria.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

Only the abstract is available; the ledger is therefore populated at the level of stated assumptions rather than detailed derivations.

free parameters (1)
  • annealing schedule parameters
    Temperature cooling rate and iteration count are required for simulated annealing but not numerically specified in the abstract.
axioms (1)
  • domain assumption The seasonal sliced Wasserstein distance adequately captures the statistical properties relevant to energy system performance.
    Invoked when the abstract states that representativeness is quantified using this metric on marginals, correlations, and seasonal structure.

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