This morning, the Energy Storage Association released its whitepaper “35 X 25: A Vision For Energy Storage,” which lays out a plan for deploying 35 gigawatts (GW – a gigawatt equals 1,000 megawatts) of storage by 2025. The report – developed in collaboration with Navigant Research – outlines a number of developments that argue in favor of energy storage, including:

• a growing need for grid reliability and resiliency, especially as more critical networks like transportation, HVAC, manufacturing, and data become increasingly electrified and demanding on our aging infrastructure;
• an economy that is becoming more dependent on sophisticated computer networks and society becomes increasingly automated and interconnected;
• a rapid increase in deployment of cost-effective renewable resources, which will benefit from having storage as a dance partner;
• an increasing need for a more flexible and adaptable power grid that will benefit from storage resources that are modular and require short development lead times;
• a dynamic of continuing improvements in storage technologies; and
• a steady and rapid decline in costs – especially for lithium ion batteries, which are expected to shoulder much of the burden

A view from the bridge

It is by ESA’s own admission, an ambitious plan. However, in a conversation prior to the report’s release, ESA CEO Kelly Speakes-Backman expressed confidence that these trends are aligning to help realize this vision. A large infusion of storage can add tremendous value to the grid and to society.

Speakes-Backman noted that while the storage addressed in the report includes all energy storage technologies, many stationary storage deployments will utilize lithium-ion technologies, and that associated costs are dropping steadily, benefiting from economies of scale resulting from their use in consumer electronics and electric vehicles. Over time, she observed, supply chains will continue to become more efficient, further driving down battery costs. And – similar to the experience in the solar industry – affiliated costs, ranging from customer acquisition and financing to inverters and balance of system, will plummet as well.

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Solar power is potentially the greatest single energy source outside of controlled nuclear fusion, but the Sun is literally a fair weather source that relies on daytime and clear skies. To make solar energy a reliable, 24-hour source of energy, a team of scientists at Sweden’s Chalmers University of Technology in Gothenburg is developing a liquid energy storage medium that can not only release energy from the Sun on demand, but is also transportable.

The Chalmers team has been working on variants of its system, called a MOlecular Solar Thermal (MOST), for over six years, with a conceptual demonstration in 2013. It differs from other attempts to store solar energy in things like heated salts and reversing exothermic reactions in that the MOST system stores the energy directly in the bonds of an organic chemical.

In this case, the scientists exposed a hydrocarbon called norbornadiene to light. This alters the chemical bonds, turning it into quadricyclane. Altering the temperature of the quadricyclane or exposing it to a catalyst reverses the effect and energy in the form of heat is released and carried off by a water jacket.

According to the team, the present system converts 1.1 percent of sunlight directly into chemical bonds, which is 100 times more efficient than the 2013 version that could only manage 0.01 percent. In addition, the new liquid storage system replaces ruthenium, a rare metal, with carbon-based elements that are much cheaper. Additionally, it can go through over 140 store and release energy cycles without noticeable degradation.

“The technique means that we can store the solar energy in chemical bonds and release the energy as heat whenever we need it.” says team leader Kasper Moth-Poulsen. “Combining the chemical energy storage with water heating solar panels enables a conversion of more than 80 percent of the incoming sunlight.”

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Scientists in China and the United States are working on a novel way to kill two birds with one stone: capturing carbon-dioxide pollution to use in an energy-storage system that can back up clean sources like solar and wind.

Compressed air is already employed in one of the cheapest forms of energy storage. When windmills are spinning and the sun is shining, excess energy is used to compress air that later, when the air is still and the sky dark, is blasted through turbines mixed with natural gas. But that method produces a lot of waste heat and its own carbon footprint.

Using CO2 in a different way could avoid those problems.

“Now, we have been thinking about how to use CO2 for energy storage,” Curtis M. Oldenberg, a senior scientist at Lawrence Berkeley National Laboratory, told me via email, “and came up with the idea of using it as the working fluid in a closed loop and having the gas spin a turbine without combustion.”

Working with colleagues at LBL and the North China Electric Power University in Beijing, Oldenburg proposed a system in which captured CO2 is compressed—when the wind is blowing or the sun is shining—to a supercritical fluid state and pumped into a reservoir in a deep saline aquifer. When there’s no wind or the sky is dark, the CO2 can be released to a more shallow, low-pressure reservoir. As it rushes from the high-pressure reservoir to the low-pressure reservoir, it spins a turbine, producing electricity.

Their model achieved higher energy-storage density than conventional compressed-air systems, the scientists contend in a paper they published last July in the journal Energy Conversion and Management.

Chinese scientists had already considered using CO2 to smooth the intermittency of Chinese wind farms. In 2015, scientists from Xi’an Jiaotong University published a performance analysis of a system using liquid carbon dioxide.

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China’s deployment of energy storage looks set to continue an upward trajectory, with almost 600MW in the pipeline as of the third quarter this year.

According to figures released by the China Energy Storage Alliance (CNESA), 14 new projects were announced in Q3 2016 totalling 587MW. This includes projects that are in planning stages, under construction and that have gone online in the quarter. This appears to represent a significant boost to the sector, and is a vast 586% increase on the same period of last year. Up until the beginning of the quarter, CNESA found, 170.6MW of energy storage was in operation in the country.  

The bulk of this large figure is contributed by a single project, a touted 400MW supercapacitor storage station with storage duration of four hours in Guazhou County, in the northern Gansu province, a couple of hundred kilometres south of the border with Mongolia. This project will be used to demonstrate the use of storage in preventing wind power capacity curtailment on a microgrid. The project, by Shidai Jiahua Co, requires US$680 million in investment and has an expected payback time of 16 to 18 years.

There was also a 160MW local government project in Inner Mongolia, another microgrid to be used for renewables integration. The local authority of Xilin Gol, one of Inner Mongolia’s 12 sub-divided regions, is keen to trial retail sales of electricity from independent suppliers and this project represents a major step forward in this regard.

While these two huge projects are in northwestern regions of China, Jiangsu in the east will get some significant new projects including a 1.5MW/12MWh project from partners including battery maker Narada Power, inverter maker Sungrow and project developer GCL Power, which is an arm of one of China’s biggest PV groups, GCL Poly. Narada Power was also involved in a 15MW/120MWh project in Jiangsu’s Wuxi City Xingzhou Industrial Park.

Overall, renewables integration appears to be the biggest application driver for energy storage in China, as seen in the diagram below. While big announcements were plentiful, only 1.5MW of storage actually came online in Q3, which was nonetheless a 50% increase on the same period of 2015.

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Two SDSU engineering researchers are using biochar, an inexpensive carbon-rich material and a new method of creating the porous surface needed to capture electricity to reduce the cost of supercapacitors.  

The ability to absorb and discharge energy quickly make supercapacitors an integral part of energy harvesting systems, however, supercapacitors are expensive. About half the materials cost comes from the use of activated carbon to coat the electrodes, according to Materials Today. Supercapacitor-grade activated carbon can cost $15 per kilogram.

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Greensmith Energy, one of the largest providers of energy storage software and integration services, announced the North American launch of its behind-the-meter energy storage solution, Omni⁴. The Greensmith Omni⁴ solution is a distributed energy storage platform bundled with the industry’s most advanced software controls to maximize a complete range of behind-the-meter and microgrid applications in multiple sizes—including fleet aggregation.

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