Working Papers

Selected working papers by team members

Preparing for the next crisis: How to secure the supply of essential goods and services” Fabra, N., M. Motta and M. Peitz. Working paper.

The COVID-19 crisis has demonstrated a lack of preparedness for pandemics and other global crises. Private incentives are often insufficient to be prepared for rare events with a large negative effect. Instead, governments and supranational institutions should implement mechanisms for prevention, detection and mitigation of crises. Electricity capacity markets provide important lessons for the provision of essential goods in such events.

Predictive Counterfactuals for Treatment Effect Heterogeneity in Event Studies with Staggered Adoption” Souza, M. Working paper | SSRN Working paper.

This paper introduces a machine-learning based approach for estimation of treatment effect heterogeneity in event studies with staggered adoption. Simulations demonstrate how the approach can be accurate and efficient, even in complex settings where effects vary across time. The method is applied to recover heterogeneity of effects from a large residential energy efficiency program.

Variable Pricing and the Cost of Renewable Energy” Imelda, M. Roberts, M. Fripp. NBER working paper | Working paper.

We evaluate the potential gains from dynamic pricing in high-renewable systems using a novel model of power supply and demand response. We find that dynamic pricing increases social surplus up to 23 percent in a 100 percent renewable power system. High renewable systems, including 100 percent renewable, are remarkably affordable.

Auctions with Unknown Capacities: Understanding Competition among Renewables” Fabra, N., and G. Llobet. Slides|  CEPR working paper 14060 | Working paper.

We characterize bidding equilibria and market outcomes in renewables-dominated systems. A key feature of the model is that the availability of renewable capacity is random and it is private information.

Clean Energy Access: Gender Disparity, Health, and Labor Supply ” Imelda and Anjali P. Verma. Working paper.

We investigate the implication of a large scale household clean energy transition and find that improvement in women’s health, particularly among those who spend most of their time indoors doing housework, can drive the increase in their productivity, hence allowing them to supply more market labor.

Market Power and Price Discrimination: Learning from Changes in Renewables Regulation” N. Fabra and Imelda. Working paper | Slides

Is it possible to reduce price discrimination while enhancing social welfare? In this paper, we explore how forward contracts could contribute towards both goals.

Incentives for Information Provision: Energy Efficiency in the Spanish Rental Market” Xueying Bian and N. Fabra. 2020. Energy EconomicsWorking paper | published version

Cooking that kills: Cleaner energy access, indoor air pollution, and health” Imelda. 2020. Journal of Development EconomicsWorking paper | published version

Work in Progress

Selected ongoing work by team members

Real Time Pricing for Everyone” Fabra, N., D. Rapson and M. Reguant

We measure the elasticity of households’ electricity demand when faced with Real Time Prices.

The Distributional Impacts of Real-Time Pricing in the Spanish Residential Electricity Market” Cahana, M., N. Fabra and M. Reguant

We examine the distributional impacts that occur as a result of the adoption of Real Time Pricing for households.

Storing Power: Market Structure Matters” D. Andrés-Cerezo and N. Fabra

We asses firms’ incentives to operate and invest in electricity storage facilities under different market structures, including competitive and strategic storage owners in the cases in which the storage owner is integrated with a dominant electricity producer or it is a stand-alone firm. The results are key to understand how to regulate electricity storage, an issue which is critical for the deployment of renewables in electricity markets.

Technology Neutral versus Technology Specific Procurement” N. Fabra and J.P. Montero

A principal (e.g., a regulator, a firm) needs to procure multiple units of a good or service that can be produced with heterogenous technologies. Should she procure these units by posting separate prices for each technology? Or should she instead procure these units by running technology-specific or technology-neutral auctions? In answering these questions, we identify the trade-offs involved. We show how the answers depend on the nature of the available technologies and the extent of information asymmetry regarding their costs.

Published Papers

Selected publications of the team members


Cooking That Kills: Cleaner Energy Access, Indoor Air Pollution, and Health” Imelda, Journal of Development Economics, 2020.

I find significant health benefits from a large scale clean energy transition, suggesting that subsidizing of cleaner-burning fuels can pay public health dividends. 


Social comparison nudges without monetary incentives: Evidence from home energy reports” Myers E. and M. Souza, Journal of Environmental Economics and Management,  101, 102315, 2020

We explore the mechanisms driving the effectiveness of a widely-used behavioral intervention to promote energy conservation. Results suggest that the nudges induce almost no behavioral changes for heating demand in settings where tenants do not directly pay for energy.

2.Energy Economics

Incentives for Information Provision: Energy Efficiency in the Spanish Rental Market” Bian, X. and N. Fabra. Energy Economics, 2020.

We assess landlords incentives to obtain and disclose energy efficiency certificates in the rental market. We show that incentives to provide energy efficiency information are higher in markets with higher penetration of certificates.

1.American Economic Association Papers Proceedings

Indoor Air Pollution and Infant Mortality: A New Approach” Imelda, American Economic Association Papers & Proceedings,  108, 416-421, 2018

We evaluate the effects of a program, implemented by the Indonesian government, which promoted the substitution of kerosene by gas as cooking fuel. We find that four fewer infants died per 10,000 live births than would have in the absence of the program.


Why are rented dwellings less energy-efficient? Evidence from a representative sample of the U.S. housing stock” Souza, M., Energy Policy,  118, 149-159, 2018

This paper compares energy-efficient appliance adoption rates across U.S. residential markets. Results suggest that renters are less likely than homeowners to have energy-efficient appliances. Differences are attenuated when landlords pay the utility bills, when energy prices are higher, and for longer-term rentals.

2.Energy Economics

A Primer on Capacity Mechanisms” Fabra, N., Energy Economics, 75, 323-335, 2018

We model the need and effects of capacity mechanisms in electricity markets. We find that combining price caps and capacity payments allows to disentangle the two-fold objective of inducing the right investment incentives while mitigating market power.

3.American Economic Review

Pass-through of Emissions Costs in Electricity Markets”, Fabra, N., and M. Reguant, American Economic Review, 104(9), 2872-2899, 2014

We find that the pass-through rate of carbon prices to electricity prices in the Spanish electricity market is above 80%. The high frequency of auctions and the symmetry across all firms’ technology portfolios contribute to such a high pass-through rate.

4.European Economic Review

How to Allocate Forward Contracts: the case of electricity markets”, Fabra, N., and M.-A. de Frutos, European Economic Review, 56(3), 451-469, 2012

We model strategic bidding behavior in electricity markets. We show that allocating forward contracts across firms contributes to mitigating market as long as the contract allocation makes all firms virtually symmetric.

5.Economic Journal

Market Design and Investment Incentives”, Fabra, N., N-H von der Fehr and M-A de Frutos, Economic Journal, 121, 1340-1360, 2011

We assess firms’ investment incentives in electricity generation capacity when the energy market is organized as either a uniform-price auction or a discriminatory auction. We find that investment incentives are similar across the two auction formats, while prices tend to be lower under the discriminatory auction.

6.Energy Economics

Supply Security and Short-Run Capacity Markets for Electricity”, Fabra, N., and A. Creti, Energy Economics, 29 (2), 259-276, 2007

We model the interaction between capacity markets and energy markets when nearby countries rely on scarcity pricing to induce capacity investments.

7.RAND Journal of Economics

Designing Electricity Auctions”, Fabra, N., N-H von der Fehr, and D. Harbord, Rand Journal of Economics, 37 (1), 23-46, 2006

We model strategic bidding behavior in electricity markets organized as either uniform-price auctions or discriminatory auctions. We show the latter mitigate market power, resulting in lower albeit more volatile prices.

8.International Journal of Industrial Organization

Price Wars and Collusion in the Spanish Electricity Market”, Fabra, N., and J. Toro, International Journal of Industrial Organization, 23 (3-4), 155-181, 2005

We study the occurrence of price wars in the Spanish electricity market. We find evidence consistent with the use of such price wars as disciplining devices among colluding firms.

9.Energy Journal

The Spanish Electricity Industry: Plus ca Change” con Claude Crampes, Energy Journal, 26, 2005

We describe regulatory changes in the Spanish electricity market, which is embarked in an ongoing process of reform.

10.Journal of Industrial Economics

Tacit Collusion in Repeated Auctions: Uniform versus Discriminatory auctions”, Journal of Industrial Economics, 51 (3) 271-293, 2003

We show that tacit collusion is more easily sustainable under uniform-price auctions as compared to discriminatory auctions.