Renewables and Grid Management: Chart Sparks Debate
A demand and generation chart reignites debate: nuclear doesn't modulate, solar and wind do. Monthly data raises doubts about backup sources.
English · Original discussion in Spanish · Published
Renewables are no longer backup: they are the grid
An electric demand chart with five overlapping layers—demand, nuclear, wind, photovoltaic, thermal solar, and hydro—supports an uncomfortable thesis: it is not nuclear that modulates generation minute by minute, but solar and wind. Nuclear, it is argued, operates on a flat curve, takes days to change output, and does not trinc the sawtooth patterns of consumption. Photovoltaic, however, rises when demand peaks and falls when it eases. At dusk, when solar drops to zero, wind fills the gap, trinc by hydro. The conclusion drawn from the chart is direct: the narrative that renewables need nuclear for support is, at best, debatable.
What the chart says and its criticisms
The initial premise is simple: the gray demand curve is not flat; it has daily oscillations and short-term sawtooth spikes. Generation by technology is overlaid on top. The reading offered is that photovoltaics fit these spikes while nuclear remains constant because it cannot do otherwise. The first objection raised is methodological: if plants and consumers adjust based on usage, comparing inputs and outputs is circular since the sum always balances. From this perspective, only total production by technology would be valid data, which is not published with the same detail.
The response is that the chart is not misleading and shows precise system information. The disagreement is not about the data but about what can be inferred from it. Here enters a technical nuance: it is not just about large daily variations, but small fluctuations over minutes, where one sees if a technology trinc demand or simply runs independently.
The real role of hydro and fossil backup
The most repeated criticism does not deny that solar and wind vary, but disputes whether that constitutes management. The argument is that photovoltaics adapt to sunlight, not demand, and wind adapts to wind conditions. If dependent on external factors rather than human decisions, there is no management, only coincidence. Under this view, what saved the month was hydro—which is renewable but only when water is available—and combined-cycle and nuclear backup when it is not.
The counterargument focuses on results: if renewables exceed 70% of total generation on those days, which source is tracking demand? Nuclear, coal, gas, or oil? The question is left open without a definitive answer in the exchange. Specific monthly figures appear: hydro reached 19.1%, wind nearly 30%, and solar 12.7%, hampered by rain. With these numbers, the discussion shifts to whether variability is an operational virtue or a structural risk.
Eclipse, blackout, and psychological factor
The conversation includes a moment summarizing the climate: the grid operator had to issue a statement clarifying that a solar eclipse would not affect supply. The immediate irony is our dependence on celestial bodies for energy. The opposing view argues the clarification responded to public panic pressure, not actual risk.
Later, a blackout reopens the issue more harshly. The hypothesis launched is that the probable cause was network overexposure to renewable generation, causing power and frequency instability within seconds, coinciding with peak solar radiation and sufficient wind across most parks. There is no confirmation in the material: it remains a hypothesis. What is noted is that the episode entrenched positions further.
Employment, coal, and subsidy costs
The thread moves to employment and subsidies. It is claimed renewables generate more jobs than coal mining, of better quality, without silicosis or early retirement at 40, and that Germany is not reviving thermal plants as its coal consumption continues to fall. In response, critics argue renewables are also subsidized and nuclear is taxed until unprofitable, citing France as a country that does not hinder pogre. Spanish coal received €5.492 billion between 1990 and 2018, and known coal reserves last 500 years versus 9 years of domestic uranium.
The issue does not close. Some argue the problem is business and subsidies, not technology; others note thermal plants are already demolished and intermittent power without firm backup is costly. The lingering question is the one that started it all: if renewables are not manageable, who is moving the grid?
An electric demand chart with five overlapping layers—demand, nuclear, wind, photovoltaic, thermal solar, and hydro—supports an uncomfortable thesis: it is not nuclear that modulates generation minute by minute, but solar and wind. Nuclear, it is argued, operates on a flat curve, takes days to change output, and does not trinc the sawtooth patterns of consumption. Photovoltaic, however, rises when demand peaks and falls when it eases. At dusk, when solar drops to zero, wind fills the gap, trinc by hydro. The conclusion drawn from the chart is direct: the narrative that renewables need nuclear for support is, at best, debatable.
What the chart says and its criticisms
The initial premise is simple: the gray demand curve is not flat; it has daily oscillations and short-term sawtooth spikes. Generation by technology is overlaid on top. The reading offered is that photovoltaics fit these spikes while nuclear remains constant because it cannot do otherwise. The first objection raised is methodological: if plants and consumers adjust based on usage, comparing inputs and outputs is circular since the sum always balances. From this perspective, only total production by technology would be valid data, which is not published with the same detail.
The response is that the chart is not misleading and shows precise system information. The disagreement is not about the data but about what can be inferred from it. Here enters a technical nuance: it is not just about large daily variations, but small fluctuations over minutes, where one sees if a technology trinc demand or simply runs independently.
The real role of hydro and fossil backup
The most repeated criticism does not deny that solar and wind vary, but disputes whether that constitutes management. The argument is that photovoltaics adapt to sunlight, not demand, and wind adapts to wind conditions. If dependent on external factors rather than human decisions, there is no management, only coincidence. Under this view, what saved the month was hydro—which is renewable but only when water is available—and combined-cycle and nuclear backup when it is not.
The counterargument focuses on results: if renewables exceed 70% of total generation on those days, which source is tracking demand? Nuclear, coal, gas, or oil? The question is left open without a definitive answer in the exchange. Specific monthly figures appear: hydro reached 19.1%, wind nearly 30%, and solar 12.7%, hampered by rain. With these numbers, the discussion shifts to whether variability is an operational virtue or a structural risk.
Eclipse, blackout, and psychological factor
The conversation includes a moment summarizing the climate: the grid operator had to issue a statement clarifying that a solar eclipse would not affect supply. The immediate irony is our dependence on celestial bodies for energy. The opposing view argues the clarification responded to public panic pressure, not actual risk.
Later, a blackout reopens the issue more harshly. The hypothesis launched is that the probable cause was network overexposure to renewable generation, causing power and frequency instability within seconds, coinciding with peak solar radiation and sufficient wind across most parks. There is no confirmation in the material: it remains a hypothesis. What is noted is that the episode entrenched positions further.
Employment, coal, and subsidy costs
The thread moves to employment and subsidies. It is claimed renewables generate more jobs than coal mining, of better quality, without silicosis or early retirement at 40, and that Germany is not reviving thermal plants as its coal consumption continues to fall. In response, critics argue renewables are also subsidized and nuclear is taxed until unprofitable, citing France as a country that does not hinder pogre. Spanish coal received €5.492 billion between 1990 and 2018, and known coal reserves last 500 years versus 9 years of domestic uranium.
The issue does not close. Some argue the problem is business and subsidies, not technology; others note thermal plants are already demolished and intermittent power without firm backup is costly. The lingering question is the one that started it all: if renewables are not manageable, who is moving the grid?
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (137 replies).
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