煤炭上一轮的繁荣周期自2003年开始，大致在2003-2012年的十年间需求稳步上升，产量从期初的15.5亿吨上升至39.45亿吨，年均增长10%。需求增速在2011年为9.8%，之后开始下降，2014年煤炭需求增长为-2.5%，2015年进一步下降到-4.0%。与此同步的是煤炭产能大规模过剩和煤炭价格大幅度下跌以及煤炭企业全面亏损。2011年以前的高煤炭需求增长和高煤炭价格引来的大规模煤炭投资，时至今日依然在释放新增产能，加剧了煤炭企业亏损程度。

我国要大力发展可再生能源已经形成共识。但可再生能源并网有一个大障碍在于其发电具有波动性、间歇性与不可预测性。发电并网比例上升，电网波动性显著增加，稳定性降低，成本大幅度提高。因此，为了实现新能源大规模应用，必须规划相应的储能系统。

The recent slump in oil prices has had a big impact on global markets. The fundamentals that affect oil prices - a supply glut and the strengthening dollar - remain unchanged. That means oil prices will continue to face pressure. The wild volatility of oil prices is mainly due to market speculation, as well as expectations for weak growth of the global economy. In fact, the problem of oversupply in the global coal market is much more serious than the unbalanced supply in the oil market, but coal prices do not fluctuate as violently as those of oil. That is because the oil market is more dynamic, and mo......