Study Links Solar Surge to evening price increases for fossil energy
A new study in which the electricity markets in West -Australia are being investigated, shows that the rapid spread of solar installations on the roof can unintentionally increase the market power in fossil fuel producers during the evenings. Researchers from Carnegie Mellon University have developed a dynamic model that includes the operational reality of fossil fuels, including fixed start -up costs and disaster restrictions, to better assess the effects of renewable energy sources on competitive behavior.
Between 2014 and 2018, the solar capacity on the roof in Western Australia more than doubled, making it one of the most saturated regions in the world. This shift reduced the dependence on gas -fired plants during the day, which in turn forced them to be closed temporarily. However, since the solar output fades in the evening, these factories must start again with a considerable cost-up to meet the demand. The study showed that these start -up costs reduce competition after sunset, so that fossil fuel generators can increase the profit during the evening peak.
“We have developed a framework to measure market power in wholesalers for electricity,” explains Akshaya JHA, assistant professor at the Heinz College of CMU and Co -Autour is studying. “This framework is responsible for characteristics of generating unity technology, such as fixed start-up costs and disaster restrictions that are becoming increasingly relevant in the light of the global transition to intermittent wind and solar technologies.”
Because fossil generators incur fixed costs when restarting, they must earn sufficient income over variable costs to justify the operation. Traditional approaches that assess market power through price markings on marginal costs fall short of such environments. Moreover, these fixed costs act as a deterrent for access, so that competition is mitigated in important periods.
To analyze the effect of sun growth on the roof, the researchers built a benchmark that compare the actual generation and prices with a simulated market scenario in which units repair both fixed and variable costs. They integrated high -frequency data on fuel input and electricity outputs to estimate the cost curves at plant level, consisting of variable costs, fixed start -up costs and basic line costs. Their model planned output dynamically to meet demand every half hour, while the system -wide costs are minimized and to guarantee the repair of costs.
The results indicated that the growing presence of solar energy on the roof increased collective market rental for gas factories in the evening, even when it drove the emissions lower during the day. Since the electricity prices of Western Australia are determined by the regulation of the costs of services, the study concluded that these increased evening rents effectively moved the wealth of consumers to producers.
Despite minimal changes in market efficiency, the wholesale market does not record the environmental benefits of reduced emissions. As the solar sun expanded on the roof, the carbon production dropped from gas generation during the day, while evening emissions only rose slightly as a result of starting unit starting.
“Our findings are talking about the growing relevance of accepting different design characteristics that are not present in most markets outside the United States,” said Gordon Leslie, senior teacher at Monash University and Coauthor. Such a function is the allowance of generators to submit start-up bids in addition to energy births, which means that better planning is possible for hours and improves efficiency as starting starting more often occurs.
The study also underlines the importance of financial participation in day head markets, especially in systems where physical limitations limit flexibility and market power is a concern. The authors warn that sun growth on the roof can intensify these challenges by increasing the strategic value of start -up decisions.
Finally, the researchers point out that reforms of retail prices can help reduce these issues. By allowing consumers to vary per hour by the electricity prices with wholesale market signals, more use would stimulate during the day and reduce the pressure on fossil fuel factories during the evening loss, which reduces the costs for consumers and weakens the market market.
Research report:Start costs and market power: lessons of the transition from renewable energy
