A recent Op-Ed in the New York Times (about food) gave a hat tip to the Sierra Club and their Beyond Coal campaign – an effort to close all coal fired power plants by 2030. The point of the piece was the necessity of activism and organizing around a particular issue.
Since the inception of the program in 2010, no new coal plants have been built and 188 closed or planned to close in the near term. Currently just of under 40% of the electric generation capacity in the United States comes from burning coal, but the number is falling – replaced by natural gas plants and a mix of wind and solar.
As long as intermittent energy, wind and solar, constitute a small fraction of the total electric supply, grid operators can balance the load as needed by reducing power from the coal plants. But what about when the coal plants are gone? What do we do when the sun isn’t shining or the wind isn’t blowing?
There is no doubt that there is enough solar in the Southwestern US or wind the Midwest to power the nation, but storage and transmission is a controlling factor to the use of these clean sources of energy. Tea party types are resisting transmission lines on the basis of property rights and governments in conservative states are making small scale renewable energy less attractive to protect their power companies’ turf.
When one thinks of energy storage, explicitly electrical energy, batteries are it. Enter Elon Musk, billionaire entrepreneur and builder of the Tesla Electric car. More important than the electric car are the batteries that power them, at least that is what Mr. Musk thinks. He has recently gone into the battery market, not only for his cars, but for stationary applications. He introduced a 10 kWh battery that can be used for a myriad of applications.
For a home owner this means “behind the meter” storage. Obviously off the grid folks rely on batteries but even grid-tied homes can utilize storage for weathering storms when the grid goes down. Folks with grid-tied renewable energy systems can utilize storage. Some power companies have time of use metering, that is the cost of power varies as to when it is used. If a home owner has a storage capacity, S/he can chose to sell power back to the grid when the price is higher. Even without a renewable energy supply, home owners with storage can charge batteries during the night when rates are lower, then sell power back to the grid during the day, making a profit in the exchange.
Utility scale storage can be beneficial right now. Battery storage can be added incrementally to defer transmission and distribution line upgrades as demand grows. Batteries can be used to back up temporary shortages due to short term power plant outages. Not to get too far down in the weeds on these issues, suffice it to say the Batteries will play a huge part in the future of clean energy supplies.
This something we should all strive for. We will get away from burning stuff for power, and batteries will make this more practical.