An Analysis of the Decline in JEPX Day-Ahead Prices: Some Impacts of RES Supply and the COVID-19-Induced Demand Downturn (Japanese)
Bibliographic record
Abstract
I analyze data of equilibrium day-ahead prices, trading volumes, sell and buy order volumes at the Japan Electric Power Exchange (JEPX) from 30-March-2015 to 9-July-2020. A time-series analysis suggests that (a) the sell bid, buy bid and transaction volumes have followed a strong co-cycling trend since the beginning of the implicit auction of the transmission line right, and (b) the trading volume is stably related to 83% of the buy order volume. Additionally, I estimate the price elasticities of demand and supply from surveillance reports and show that (c) individual quarter transition is parallel to the price-trading volume ratio. A cross-sectional analysis suggests (d) the first and second quarter's day-time sell order volume is increasing over years, and (e) stronger pattern on weekends and holidays. Finally, I explore the implications of the above in terms of the effect of photovoltaic power generation on recent price decline during the COVID-19 pandemic, and on the form and location of the market demand curve.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".