Skip to main content
Advanced Search

Filters: Tags: Evidence (X)

5 results (41ms)   

View Results as: JSON ATOM CSV
This paper considers the issue of whether shocks to ten commodity prices (gold, silver, platinum, copper, aluminum, iron ore, lead, nickel, tin, and zinc) are persistent or transitory. We use two recently developed unit root tests, namely the Narayan and Popp (NP) [14] test and the Liu and Narayan (LN) [26] test. Both tests allow for two structural breaks in the data series. Using the NP test, we are able to reject the unit root null for iron ore and tin. Using the GARCH-based unit root test of LN, we are able to reject the unit root null for five commodity prices (iron ore, nickel, zinc, lead, and tin). Our findings, thus, suggest that only shocks to gold, silver, platinum, aluminum, and copper are persistent.
Increased interconnection has been highlighted as potentially facilitating the integration of wind generation in power systems by increasing the flexibility to balance the variable wind output. This paper utilizes a stochastic unit commitment model to simulate the impacts of increased interconnection for the island of Ireland with large penetrations of wind generation. The results suggest that increased interconnection should reduce average prices in Ireland, and the variability of those prices. The simulations also suggest that while increased interconnection may reduce carbon dioxide emissions in Ireland, Great Britain would experience an increase in emissions, resulting in total emissions remaining almost unchanged....
Natural gas wells contaminated with the toxic gas hydrogen sulfide (i.e., sour-gas wells) pose potential health risks to workers and to nearby residents. The health risks are a function of the dose-response relationship of hydrogen sulfide, the likelihood of accidental releases, gaseous emission rates, the nature of releases at the well head, dispersion of the emitted gas, and the characteristics of the population at risk. We discuss each of these factors and present a risk analysis of a hypothetical sour-gas well in the vicinity of Evanston, WY. We found that the greatest risks for life-threatening effects would occur in the northwest downwind sector after a horizontal release of gas at the well. Subacute effects...
Wind power is a maturing technology that may form an essential element of fully renewable energy systems in a number of countries. Denmark has a long history of wind power development and is planning to expand its existing capacity. If large-scale penetration of wind power is to be achieved, an integrated framework is needed that can respond to the associated challenges. This paper argues for adopting an integrated macro perspective when evaluating and building frameworks to support wind power development. This macro perspective is applied to the case of Denmark, and more specifically to concrete wind power projects in the region of Northern Jutland. The results suggest that although certain elements in the current...
The paper considers the main components of energy policy, in particular the challenges of network security of supply, long-term contracts and the environmental constraints. It is argued that policy should take account of multiple market failures and context dependent. Given energy liberalisation in the 1980s and 1990s, interventions based upon market-based instruments should be given greater prominence. Institutional reform to reflect the shift in focus towards investment in non-carbon technologies and the security issues associated with networks is proposed, notably the creation of an energy agency.