BATTERY STORAGE FOR OFF-GRID
Greenergy A&D Commodities DMCC Renewable Energy provides Battery storage – for islands and off-grid applications. Islands and rural/off-grid electrification present unique opportunities and challenges for the integration of variable renewable energy. Most islands and many off-grid areas are powered by diesel generation. This is often oversized to meet peak demand and not meant to operate below 30% of capacity. This form of generation is expensive and has high emissions. If initial investment is included, it may cost more than USD 0.352/kWh to run diesel generators whilst most utility-scale renewable power generation have Levelized costs in the range of USD 0.05–0.25 /kWh (IRENA, 2013c). The remote location, as well as the lack of infrastructure, means constant diesel imports are costly and a risk to the security of supply. Diesel generation has traditionally been used as the most accessible and cost-effective solution.
A flow battery, or redox flow battery (after reduction-oxidation), is a type of electrochemical cell where chemical energy is provided by two chemical components dissolved in liquids contained within the system and separated by a membrane. Ion exchange (accompanied by the flow of electric current) occurs through the membrane while both liquids circulate in their own respective space. Cell voltage is chemically determined by the Nernst equation and ranges, in practical applications, from 1.0 to 2.2 volts.
ISLANDS AND RURAL AREA BATTERY STORAGE
Islands represent a unique opportunity for battery storage. The technology may be utilized to help integrate renewable energy, reduce reliance on diesel and gas generation, and in some cases lower costs. Many islands operate mini-grids, have weak interconnection and a lack of flexible power sources. This means they would benefit from storage to reliably integrate significant amounts of solar or wind power. This starts in some instances from a 15% share of variable renewable energy generation in the system.
SOLAR PV AND BATTERY STORAGE
WORLD GLOBAL ENERGY STORAGE
RENEWABLE ENERGY AND THE MINING INDUSTRY
GREENERGY ADDRESSING CONCERN
Greenergy A&D Commodities DMCC Renewable Energy is addressing the concerns that mining companies and governments have regarding fuel prices, logistics, and emissions all at the same time. These projects also benefit local communities by creating jobs. In addition, many solar installations will be left behind for local use after mines have closed. Through “anchor-tenant solutions,” solar installations may even share power with distant communities while the mine is in operation.
These projects are particularly beneficial in energy-poor places like Africa.
A mine can be equipped with an 18,000-panel PV farm, which shares electricity with a nearby township. Given that 90 percent of energy demand will come from emerging markets by 2035, creative partnerships like these will be critical to meeting that demand.
Many people see renewable energy and fossil fuels as mortal enemies. One will succeed only at the expense of the other, the thinking goes. When it comes to onsite power, however, the situation reveals a more complex relationship. Renewable energy technologies can help fossil fuel developers power their mining and drilling operations.
Mining and drilling operations often sit in remote areas, far from established electricity infrastructure. Yet, they often have significant power needs—on the order of tens of megawatts (MW) and tens of gigawatt-hours (GWh) per site.
Traditionally, diesel generators provided this power. However, they are expensive to fuel ($0.28-$0.32/kilowatt-hour, by one estimate). Energy costs can represent 20-40% of mining operational costs. Further, regularly trucking in large quantities of fuel represents a risk if that supply is disrupted by bad weather, poor infrastructure, or other barriers.
New options offered by wind and solar:
Companies are slowly but steadily installing renewable energy at or near their sites to power at least some of their operations. By one estimate, the mining industry alone spent $209 million in 2013 on renewable energy investments. This makes sense since the recent cost of onsite wind and solar power can be half that of diesel generators.