If wind is treated as ‘must take’ then it ought to be treated as negative load. The net load for the schedulable generators is then
Net = Actual – Wind
I thought that was a very elegant truth when I read it a couple of weeks ago, and fought the urge to write at length in support of the simple statement. With the release of Ontario's feed-in tariff (FIT) review last week, celebrating 10700MW of renewables to be operational by 2015, I was more tempted to produce volumes illustrating the simple truth, and when I read
Tom Adams' "The affliction for consumers is not a surplus of baseload generation but a surplus of take-or-pay generation, some of it stupidly expensive," I started pulling data and formatting graphs.
The term load is meant as the power consumed. Generation must meet the consumption, so it is reasonable to view all the various generators as supply, and the demand as load. Wind and solar contracted on a 'must take' basis, which the FIT contracts are, isn't meeting demand, but it is changing the load that must be met by other generators.
Baseload therefore refers, initially, to demand. The first graph shows baseload as the minimum daily Ontario demand. Between 2005, and 2011, the minimum dropped -on average 1574MW. That, coincidentally, is about the capacity of nuclear supply due to return as Bruce 1 and 2 return to service (I think the contracts were negotiated in 2005).