A spreadsheet I regularly update with data on industrial wind turbine (IWT) generation in Ontario is cited in Parker Gallant’s recent, Wind: worst value for Ontario consumers. The same post cites the Canadian Wind Energy Association (CanWEA) commentary on Ontario’s recently released Long Term-Energy Plan 2017, which included:
New wind energy provides the best value for consumers to meet growing demand for affordable non-emitting electricity.
Let’s examine the “value” as electricity – as there is no market in Ontario for any subset of that commodity, including “affordable non-emitting”.
Two definitions of “value” from the Oxford dictionary are pertinent:
- “The regard that something is held to deserve; the importance, worth, or usefulness of something.”
- “The worth of something compared to the price paid or asked for it.”
By the first definition wind is clearly the least valued generation type in Ontario. Using only very basic hourly data sets of Hourly summary totals of grid-connected (Tx) generation by type, valued at the Hourly Ontario Energy Price (HOEP), value factor can be calculated. A value factor above 1 means more valuable than average, below 1 means less valuable, and the lowest number consistently means wind.
This graphic is captured from a page I created to view summaries of basic IESO data sources:
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Some numbers I’ve compiled for the most recent periods of Ontario electricity consumption.
IESO weekly reports run from Wednesday to Tuesday – presumably because the market opened on Wednesday May 1st, 2002.
1 The week beginning on the 20th Wednesday of 2017, May 17-23, 2017, is the first one where the average Hourly Ontario Energy Price (HOEP), weighted to the system operator’s “Ontario Demand”, was negative.
On average, it cost money to give away electricity
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A new post at the Energy Institute at Hass blog, Is the Duck Sinking?, discusses the growing appearance of negative pricing in California:
What do the negative prices tell us? At a fundamental level, they tell us that we have too much of a good and suppliers need to pay people to take it off their hands. Right now, California has too much renewable electricity. Emphasizing this point, a recent briefing from the California Independent System Operator [CAISO] noted that renewable “curtailments” were at record levels in March 2017, amounting to over 80 GWh, which is more than a typical day’s worth of solar production that month.
Is there anything to do about the negative prices? Negative prices certainly highlight the value of storage, where the basic idea is to buy low and sell high. Buying when prices are negative is especially lucrative…
Another solution is to expose more retail consumers to wholesale prices, or find other ways to encourage customers to respond to real-time prices. Economists have bemoaned the disconnect between wholesale and retail pricing for years…
If Catherine Wolfram’s post represents a significant concern for curtailments and negative pricing, it’s worth noting the situation in Ontario with Ontario’s system operator, the IESO.
It’s worth noting both because CAISO is noting the curtailment, and negative pricing, and it is acting on it.
This graphic, from the CAISO presentation noted above, shows monthly curtailment in their system:
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