Renewable Resources
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Mark C. Thurber
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Stanford's Program on Energy and Sustainable Development (PESD) is collaborating with the California Public Utilities Commissions (CPUC) on an Impact Lab that tackles an urgent policy question: How do we make sure the lights stay on as the electricity mix climbs towards state targets of 50% renewable energy in 2026 and 60% in 2030? Wind and solar are essential zero-carbon energy sources, but they are only available when the wind blows and the sun shines. Blackouts in Northern California last August were a warning that system reliability is at risk if the state doesn't act quickly to implement policies that ensure backup generation is available when needed.

The existing regulatory instrument for ensuring long-term resource adequacy, capacity payments, is not well-adapted to a high-renewables future. Capacity payments aim to ensure enough "firm capacity" is always available to keep the lights on, but the firm capacity construct is not applicable to wind and solar, which cannot be turned on and increased at the system operator’s discretion. 

The PESD/CPUC Impact Lab has proposed an alternative resource adequacy mechanism that is robust to a world of high and solar generation: auctions of Standardized Fixed-Price Forward Contracts (SFPFCs) that ensure every megawatt-hour of energy consumed in the state is hedged through long-term financial contracts. Unlike capacity payments, the SFPFCs provide a strong financial incentive for generators to meet their commitments to supply reliable energy wherever and whenever it is needed. PESD research suggests this novel policy mechanism can provide enhanced reliability and major cost savings relative to the capacity payment approach.

The CPUC has initiated a stakeholder process to consider possible implementation of this proposal, and PESD is assisting with research, policy outreach, and development of market simulation games that will allow stakeholders to gain hands-on experience with how the SFPFC mechanism would work in a realistic electricity market.

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Recent record-breaking heat waves followed by rolling blackouts in California have sparked renewed discussion about the state’s options to address future power outages. Program on Energy and Sustainable Development Director Frank Wolak spoke to Bloomberg about power market reforms as one option where California could open up its electricity to retail competition.  While pricing would better reflect grid supply and demand, it’s unlikely this option would have backing given today’s political climate.   Read more (may require subscription)

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Wolak weighs in on California blackouts

Wolak weighs in on California blackouts
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Today, the Sacramento Bee and San Jose Mercury News both quoted Program on Energy and Sustainable Development Director Frank Wolak in their stories about California’s recent blackouts.  In the Sacramento Bee’s article about the California Independent System Operator declaring a temporary ban on “convergency bidding,” Wolak came out in support of the system comprised of power generators and traders saying that it sends the proper price signals to drive supply. The San Jose Mercury News article said that California electricity shortages will be more common during major heat waves due to the state’s shift away from fossil fuels providing more consistent power to cleaner but more intermittent sources such as solar and wind energy.  “We have a much more risky supply of energy now because the sun doesn’t always shine when we want and the wind doesn’t always blow when we want,” said Wolak. “We need more tools to manage that risk. We need more insurance against the supply shortfalls.”

 

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Wolak: Solving California’s Power Crisis

Wolak: Solving California’s Power Crisis
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The basic features of an efficient short-term wholesale market design do not need to change to accommodate a significantly larger share of zero marginal cost intermittent renewable energy from wind and solar resources. A large share of controllable zero marginal cost generation does not create any additional market design challenge relative to a market with a large share of controllable positive marginal cost generation. In both instances, generation unit owners must recover their fixed costs from sales of energy, ancillary services, and long-term resource adequacy products.

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Program on Energy and Sustainable Development
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Frank Wolak
Frank Wolak
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Mark C. Thurber
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The Program on Energy and Sustainable Development (PESD) and the California Public Utilities Commission (CPUC) are partnering on an Impact Lab to design and implement next-generation policies and regulations that support California's ambitious renewable energy goals. “Public support for aggressive climate action in California could decline if there are adverse grid reliability and cost implications from pursuing these goals,” said Frank Wolak, professor of economics and director of PESD. Wolak and the PESD team are working with the CPUC to develop: 1) policies to ensure resource adequacy with a very high share of intermittent renewable energy, 2) distribution pricing to support cost-effective and equitable renewable energy deployment, and 3) transmission planning frameworks that are robust to high wind and solar shares as well as future climate impacts. Read more (fifth white box near the bottom)

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We show that the negative demand shock due to the COVID-19 lock-down has reduced net-demand system demand less the amount of energy produced by intermittent renewables and net imports that must be served by controllable generation units. Introducing additional intermittent renewable generation capacity will also reduce the net-demand, which implies the lock-down can provide insights about how electricity markets will perform with a large share of renewable generation capacity. We find that the lock-down induced demand shock in the Italian electricity market has reduced day-ahead market prices by 23 EUR/MWh (-45%) but re-dispatch cost have increased by 9 EUR/MWh (+103%) per MWh of load, both relative to the average to the same magnitude for the same time period in previous years. Relating the actual re-dispatch cost to a non-COVID-19 re-dispatch cost counter-factual derived from a deep-learning model estimated using pre-COVID-19 data yields an increase of 40%. We argue that the difference between these two re-dispatch cost increases can be attributed to the increased opportunities for suppliers with controllable units to exercise market power in the re-dispatch market in these low net-demand conditions. These results imply that an increased intermittent renewable energy share is likely to increase significantly the costs of maintaining a reliable grid because of the low levels of net-demand.

 

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Program on Energy and Sustainable Development
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Christoph Graf
Federico Quaglia
Frank Wolak
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On June 3, Program on Energy and Sustainable Development (PESD) Director Frank Wolak participated as one of three energy experts in a virtual panel discussion evaluating the pros and cons of proposed “reach codes”  banning natural gas in the city of Los Altos, California.  The panel discussion - "Mandating All Electric:  Is Banning Natural Gas Really The Answer?" - was organized by a group of Los Altos residents who believe city residents’ voices need to be considered in government decisions. 

Reach codes are being considered for all new residential and commercial building construction, and all “scrape” remodels in the city.  A reach code is a local building energy code that reaches beyond the state minimum requirements for energy and its use in building design and construction. These codes facilitate local government’s efforts focused on clean air, climate solutions, and renewable energy economics.

Recorded discussion

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The variability of solar and wind generation increases transmission network operating costs associated with maintaining system stability. These ancillary services costs are likely to increase as a share of total energy costs in regions with ambitious renewable energy targets. We examine how ecient deployment of intermittent renewable generation capacity across locations depends on the costs of balancing real-time system demand and supply. We then show how locational marginal network taris can be designed to implement the ecient outcome for intermittent renewable generation unit location decisions. We demonstrate the practical applicability of this approach by applying our theory to obtain quantitative results for the California electricity market.

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Program on Energy and Sustainable Development
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Thomas Tangeras
Thomas Tangeras
Frank Wolak
Frank Wolak
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Hourly plant-level wind and solar generation output and real-time price data for one year from the California ISO control area is used to estimate the vector of means and the contemporaneous covariance matrix of hourly output and revenues across all wind and solar locations in the state. Annual hourly output and annual hourly revenues mean/standard deviation efficient frontiers for wind and solar resource locations are computed from this information. For both efficient frontiers, economically meaningful differences between portfolios on the efficient frontier and the actual wind and solar generation capacity mix are found. The relative difference is significantly larger for aggregate hourly output relative to aggregate hourly revenues, consistent with expected profit-maximizing unilateral entry decisions by renewable resource owners. Most of the hourly output and hourly revenue risk-reducing benefits from the optimal choice of locational generation capacities is captured by a small number of wind resource locations, with the addition of a small number of solar resource locations only slightly increasing the set of feasible portfolio mean and standard deviation combinations. Measures of non-diversifiable wind and solar energy and revenue risk are computed using the actual market portfolio and the risk-adjusted expected hourly output or hourly revenue maximizing portfolios.

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National Bureau of Economic Research
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Frank Wolak
Frank Wolak
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Electricity tariff reforms will be an essential part of the clean energy transition. Existing tariffs rely on average cost pricing and often set a price per unit that exceeds marginal cost. The higher price encourages over-adoption of residential solar panels and under-adoption of electric alternatives to fossil fuels. However, an efficient tariff based on fixed charges and marginal cost pricing may harm low-income households. We propose an alternative methodology for setting fixed charges based on the predicted willingness-to-pay of each household. Using household data from Colombia, we show the fiscal burden and economic inefficiency of the existing tariffs. We then show how our new tariff methodology could improve economic efficiency and create incentives for the adoption of clean energy technologies, while still leaving low-income households better off.

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Program on Energy and Sustainable Development
Authors
Shaun McRae
Shaun McRae
Frank Wolak
Frank Wolak
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