The Game Changer

Maureen-McIntyreThe global energy landscape is shifting, and the game changer is energy storage.

The public has long favored solar and wind over fossil and nuclear energy technologies, at least in the abstract. The benefits are certainly compelling—no emissions, no fuel costs, low water requirements, no environmental damage during extraction, no worries about spills or meltdowns.

The intermittency of wind and solar resources, however, has long been a barrier to widespread use. Enter energy storage.

In our ongoing effort to provide information and resources to help you be an effective solar advocate and consumer, we’ve launched a new section called Good News You Can Use. A highlight of this issue’s Good News is Deutsche Bank’s report, Crossing the Chasm. This study predicts that batteries to store energy from intermittent sources will be available at a competitive price and on a large scale within the next five years or less.

The consequences of such rapid market penetration are profound. As Rocky Mountain Institute’s James Mandel and Leia Guccione point out in “The Economics of Load Defection,” the steadily improving economics of distributed energy technologies and energy storage present utility customers with new choices, many of which have long been the sole domain of utilities. Customers can get their electricity from the grid; a solar-plus-battery system; or some combination of the grid, solar photovoltaics (PV), and batteries. How utilities respond to this new reality will shape the choices their customers make. As the authors frame it, the U.S. electric grid is indeed at a metaphorical fork in the road.

Sky Stanfield and Amanda Vanega of the Interstate Renewable Energy Council are also concerned that all the stakeholders in this new energy landscape make choices that capture the many benefits of integrating distributed energy and storage into the electric grid. In “Deploying Distributed Energy Storage,” they urge regulators to develop innovative, forward-thinking policies that enable the smooth integration of renewables and energy storage into the existing electrical system. Proactive steps now to establish appropriate regulatory, market, and technical foundations for these technologies will reduce the likelihood of future market delays or slowdowns.

In “Creating a Safe, Stable Grid for Solar,” Don Gwinner offers an example of a technical fix for a specific challenge to increasing penetration of solar PV on the electrical grid. The National Renewable Energy Laboratory, Hawai’ian Electric Companies, and SolarCity are collaborating to evaluate PV inverter performance under simulated real-world operational conditions. This work enables safe deployment of grid-connected solar PV on homes and buildings in Hawai’i and elsewhere.

This issue’s Viewpoint, “Peak Oil Redux,” by Timothy Schoechle and James Turner, echoes another point in the Deutsche Bank report—that distributed energy resources and storage offer emissions-free electricity with no fuel cost. Schoechle and Turner note that we may already have seen “peak oil,” not because of scarcity, but because of abundance and falling demand. No matter how cheap oil gets, it will never get to zero. PV, on the other hand, has “already reached parity with fossil fuels in some places, and the equipment just gets better and cheaper every day.” And PV’s fuel cost will always be zero.

Crossing the Chasm draws some other notable conclusions, among them that the potential solar market is “massive,” and that more than half the countries the authors reviewed are likely at grid parity today. In addition, “the ratio of coal-based wholesale electricity to solar electricity cost was 7:1 four years ago. This ratio is now less than 2:1 and could likely approach 1:1 over the next 12-18 months.”

This train looks unstoppable. Rona Fried said it best in her Green Business column: “WOW!”

Maureen McIntyre is the editor and publisher of SOLAR TODAY.

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2 Responses to The Game Changer

  1. Mark Wiener Reply

    May 8, 2015 at 2:18 pm

    Anyone have any info on solid state batteries for PV storage.

    Thanks much,

  2. Scott Sklar Reply

    May 20, 2015 at 4:30 pm

    We are in a renaissance in material science and we are seeing that in electric energy storage. We have more types of batteries entering the market than any time in history. Today a consumer can buy enhanced lead acid AGM batteries, sodium batteries, vanadium batteries, lithium ion batteries, zinc batteries, cobalt batteries, etc. I have used many of them in my various energy projects.

    A supercapacitor (SC) (sometimes ultracapacitor, formerly electric double-layer capacitor (EDLC)) is a high-capacity solid state capacitor . Supercapacitors are used in applications requiring many rapid charge/discharge cycles. My solar watch has a supercapacitor, which has no battery, and needs an hour of sunlight to charge and never needs a battery change.

    Supercapacitors are being used in many electronic portable appliances, military equipment, and even larger ones are used to power small electric buses in China, with charge-up every third bus stop. Axion Power (PA) has a new carbon-lead battery that incorporates supercapacitors which handles spike loads, that I have used in a few projects and works well.

    Supercapcitors, alone, are too early for building-based systems because we need more intelligent electricity/storage management software to handle different types of batteries, supercapacitors, and that arbitrage that with different on-site charging (solar, CHP, small wind, etc) and the electric grid (if any). That is not too far in the future, and there many firms that are seriously involved to handle the interplay between electric energy storage, on-site energy generation, and the electric grid.

    Scott Sklar, Adjunct Professor, GWU and President, The Stella Group, Ltd.

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