This comment discusses in more detail one of the primary messages in the paper by David Humphreys and Keith Welham, namely the fundamental shift in the steam coal industry away from security of supply concerns and national focuses towards an international and cost-driven perspective. On the...

Many models have been suggested to deal with the multi-reservoir operation planning stochastic optimization problem involving decisions on water releases from various reservoirs in different time periods of the year. A new approach using genetic algorithm (GA) and linear programming (LP) is...

This paper presents the development of an operating policy model for a multi-reservoir system for hydropower generation by addressing forecast uncertainty along with inflow uncertainty. The stochastic optimization tool adopted is the Bayesian Stochastic Dynamic Programming (BSDP), which...

The Mindanao electric power problem, which led to a crisis situation in summer 2012, is primarily due to inadequate baseload capacity and unbalanced generation capacity mix. The crisis might stage a comeback when the days of relatively cooler weather and heavier rainfall are over and the annual...

At present the worldwide energy market is dominated by fossil fuels, despite that it has been demonstrated to be a major source of environmental problems. In Cuba, about 96% of the power generation comes from fossil fuels, and 26% of this is produced by decentralized power stations (DPSs). DPS...

A reverse electrodialysis (RED) system utilizes the transport of cations and anions from controlled mixing of saline water (e.g., seawater) and freshwater (e.g., river water) through selective ion exchange membranes for power generation. Sodium chloride alone has been widely used to create power...

There is a growing interest in direct thermal-to-electric energy conversion using solid state devices such as thermophotovoltaic (TPV) generators. TPV devices convert thermal radiation from heat sources into electricity without involving any moving parts. TPV opens up possibility for efficient...

This paper presents the development of a micro-power pack using automotive alternators powered by a micro-gas turbine (MGT) to recharge battery packs, in particular for electric vehicles (EVs). The thermodynamic efficiency for the MGT with the power turbine is estimated from a simple Brayton...

In this research oxygen enrichment, gasoline pilot port injection, and delayed time of 50% cumulative heat release (CA50) are evaluated to expand the range for stable and safe combustion of a lean-burning biogas-fueled HCCI engine. A 4-cylinder 1.9L Volkswagen TDI engine was modified to run in...

A wide range of process and routes are available for power generation from biomass. PYROLYSIS is another emerging technology, wherein biomass is converted to liquids, gases and char — liquid fuels being the main target. Power generation using this technology is essentially the use of pyrolytic...