THE GRID IS READY NOW FOR NEW ENERGY

Wind energy integration: Some fundamental facts
Tom Gray, June 23, 2011 (Into The Wind)

"...[American Wind Energy Association] Manager of Transmission Policy Michael Goggin [posted a comment on an article by Stephen Lacey about innovative ways utility system operators are working to integrate wind, a variable source of electricity generation, with other parts of their systems. Goggin reminded readers] of some basic facts [about wind integration including]…

"…[1] There has always been a large amount of variability and uncertainty on the power system (chiefly from electric demand changing and from conventional power plants experiencing unexpected 'forced outages,' taking 1000+ MW offline instantaneously…"

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"…[2] Adding even a large amount of wind or solar energy to the grid typically only adds a small incremental amount to overall power system variability, as most of the variability introduced by wind or solar is cancelled out by opposite changes in other sources of variability, and…

"…[3] Grid operators have a number of tools to deal with variability and uncertainty on the power system today, and those tools can be readily used to deal with the incremental variability and uncertainty that comes from adding large amounts of wind or solar to the grid."

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"…[N]ew technologies like demand response are being developed to provide grid operators with even more tools to manage all types of variability on the power system…[but already] large amounts of wind and solar are being efficiently and reliably integrated onto the grid today. More than 15% of the electricity comes from wind in Ireland, Spain, Portugal, and Denmark; in the U.S., 8% of electricity on the main Texas grid and more than 15% of the electricity produced in Iowa last year came from wind energy.

"…[G]rid operators only need to balance the aggregate supply and demand for electricity on the grid. A common misconception is that the variability of each individual resource on the grid needs to be managed…[D]edicated storage or a dedicated 'backup' power plant…or combining several resources to create a virtual power plant or a microgrid [is good but over] 100 years ago we built a power grid that combines all sources of variability on the grid so that I can turn my air conditioner on and off without having a dedicated battery or other backup system attached to my house, just as a large coal or nuclear plant can be built without building dedicated backup to step in when that plant experiences an unexpected outage; trying to dis-aggregate the grid would be a step backwards…"