|
|
|
Sort Order |
|
|
|
Items / Page
|
|
|
|
|
|
|
| Srl | Item |
| 1 |
ID:
111084
|
|
|
|
|
| Publication |
2012.
|
| Summary/Abstract |
How do policy actions affect the dynamics of deregulated electricity prices? We investigate this issue in the context of the Italian Power Exchange (IPEX), using data on the daily average day-ahead price (PUN) between April 2004 and December 2008.
Estimates of baseline time series models (SARMAX and SARMAX-EGARCH) and their forecasting performances suggest that the trend in natural gas prices, market power indicators, deterministic weekly patterns, perceived temperatures, persistence in conditional volatility, and the inverse leverage effect are essential features of the PUN dynamics. We then augment the best-performing models with dummies that account for changes in the market architecture, such as the introduction of contracts for differences (CfDs) to support renewables, trading of white certificates for energy efficiency, and the demand-side liberalization. The findings show that changes in the market architecture affected both the PUN level and its volatility. Specifically, wholesale electricity prices and volatility appear to have decreased upon the introduction of CfDs, only to be pushed upwards following the start of white certificates' trading and retail liberalization. Moreover, after controlling for reforms the inverse leverage effect vanishes, and the persistence in volatility is lower than in the baseline estimates.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 2 |
ID:
176853
|
|
|
|
|
| Summary/Abstract |
In this paper, we estimate volatility spillovers before and after the introduction of a new cable linking different electricity market zones. Using wholesale electricity prices for Sardinia and two neighbouring Italian market zones for the period 2005–2015, we focus on the effects of the SAPEI cable, fully operational since March 2011. VAR-GARCH estimates indicate that the SAPEI cable allowed for stronger volatility transmission towards Sardinia, a smaller zone and a net importer from its new neighbour, the Central Southern zone, albeit the effect was significant only off-peak. Higher conditional correlations between zonal prices are also observed after the cable was introduced. Some implications are drawn about the interaction between market size, export positions, congestion, and volatility transmission.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 |
ID:
163569
|
|
|
|
|
| Summary/Abstract |
This paper provides estimates of quantile regression models of the relationship between Italian day-ahead electricity prices, the supply of renewables and the inception of a new cable (SAPEI, linking Sardinia with the Italian peninsula), in the 2006–2015 time window. The results confirm the merit order effects detected in the existing literature, both for photovoltaics and wind power, more strongly in market conditions characterised by moderately low price levels and with some implied increase in volatility. The new cable has apparently challenged the ability of power generating companies to extract value through price spikes, has mitigated volatility, and its effects have been complementary with those of renewables. Effects from photovoltaics are more sensitive to robustness checks. Differences across zonal markets are nonetheless detected.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|