Lithium-ion batteries will soon back up the power grid on the Hawaiian island of Kauai, providing the stability to handle intermittent power fluctuations from renewable energy sources.
More than 30,000 battery cells, each approximately a half-liter in volume, will be deployed as part of a new 12-MW solar energy park under construction on the island. “The batteries can provide a short burst of discharge power or they can absorb a very short burst of charge power to maximize the grid’s stability,” Jim McDowall, business development manager for Saft, told Design News.
Kauai Island Utility Cooperative (KIUC) will use the batteries to help match its electrical supply to customer demand, McDowall said. In all, KIUC will employ eight 20-foot-long Intensium Max 20M containers from Saft, each containing 4,060 cells packaged in 290 modules. Together, the eight units will provide 6 MW of power and 4.64 MWh of energy. Two power conversion containers will augment the storage system, converting DC current from the batteries to AC current for the grid.
The Kauai Island Utility Cooperative will employ eight 20-foot-long Intensium Max 20M containers from Saft, each containing 4,060 cells packaged in 290 modules. Together, the eight units will provide 6 MW of power and 4.64 MWh of energy. (Source: Saft)
Like Tesla Motors, Saft uses a nickel-cobalt-aluminum oxide (NCA) chemistry in a cylindrical format cell. At roughly half-a-liter in size, however, Saft’s cells are much larger than Tesla’s 18650-sized cells. Saft has been working with the NCA chemistry for more than 19 years, McDowall said.
The new battery energy storage system (BESS) will be part of a planned $50 million solar energy park on the island. The system will provide spinning reserve and frequency support during loss of generation by pooling with other KIUC sources. KIUC, which is the only franchised provider of electric service on the island, has an all-time peak load of 78 MW.
The concept of battery-based grid storage has gained favor in recent years as more utilities look to renewable energy sources, such as wind and solar. Experts believe that those renewables will need some form of storage to make a bigger impact, essentially because their power is intermittent and therefore unpredictable.
For that reason, many industry analysts believe the grid storage market is on the cusp of huge growth. A 2012 study from Lux Research Inc., "Grid Storage Under the Microscope: Using Local Knowledge to Forecast Global Demand," predicted the market for grid storage would grow 40X over the next few years, reaching $113.5 billion in 2017.
“If you have a low percentage of renewables, then it’s probably not a problem to let them produce (power) whenever they’re available,” McDowall told us. “But when you get to higher percentages of renewables, you need storage.”
Absolutely true, patb2009. Sam Jaffe of Navigant Research said this about Tesla's welding process earlier this year:
"One of the reasons that other manufacturers ran screaming from the room when they thought about using little cylindrical cells is that the cells must be welded in two spots," Jaffe told us. "And they have to do that for each of the 7,000 or 8,000 cells."
Still, Tesla has found a way to accomplish that and will continue to take advantage of its manufacturing expertise in the Gigafactory. "In some ways, Tesla's true technological advance isn't about batteries," Jaffe said. "It's about a welding process that they've figured out how to do quickly, correctly, and cheaply."
I didn't realize California had that goal--it's a good one to strive for. And yes, you're right, storage of energy is sort of the next big hurdle to overcome to greater adoption of renewables in the grid. I've written a few stories about solar batteries and the work is promising.
the link describes the Tesla Roadster's battery pack, smaller predecessor to the Model S. I think that Tesla did a phenomenal job of engineering all aspects of their source for stored energy. Reliability and above all, safety, were foremost in their minds - the future will prove whether they've succeeded, but the evidence looks pretty good in the short term. BTW - though I may disagree on this point, I love your coverage of vehicle technologies...
"The concept of battery-based grid storage has gained favor in recent years as more utilities look to renewable energy sources, such as wind and solar. Experts believe that those renewables will need some form of storage to make a bigger impact, essentially because their power is intermittent and therefore unpredictable."
Charles, storing and using at later point is a good option; but it can incurred energy loss also. First due to low efficiency of batteries only 80% of the batteries can be retrieved for reuse. Moreover for big projects, the requirements of batteries are larger in number.
The question of whether engineers could have foreseen the shortcut maintenance procedures that led to the crash of American Airlines Flight 191 in 1979 will probably linger for as long as there is an engineering profession.
More than 35 years later, the post-mortem on one of the country’s worst engineering disasters appears to be simple. A contractor asked for a change in an original design. The change was approved by engineers, later resulting in a mammoth structural collapse that killed 114 people and injured 216 more.
If you’re an embedded systems engineer whose analog capabilities are getting a little bit rusty, then you’ll want to take note of an upcoming Design News Continuing Education Center class, “Analog Design for the Digital World,” running Monday, Nov. 17 through Friday, Nov. 21.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.