Are Renewable Portfolio Standards Effective to Reduce CO 2 Emissions?
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1 Are Renewable Portfolio Standards Effective to Reduce CO 2 Emissions? Cristián Hernández Universidad de los Andes, Santiago, Chile School of Business and Economics June 21, 2013
2 Co-authors and acknowledgements Co-authors: Alexander Galetovic (Universidad de los Andes) Cristián Muñoz (Universidad Católica de Chile and AES Gener) Luz María Neira (Universidad de los Andes) I gratefully acknowledge the financial support of Universidad de los Andes FAI Iniciación N
3 The question At least 96 countries have generation targets with renewable energy (REN21, 2011). The purpose of these policies usually is to reduce carbon dioxide (CO2) emissions. Chile has a 10% renewable portfolio standard (RPS), the senate is discussing an increase to 20%, and some candidates to the presidency are promising a 30% RPS. Are renewable portfolio standards effective to reduce CO2 emissions? and if they are, how much will they cost?
4 Major findings Renewable portfolio standards substitute investments in base load technologies. Thus, their effectiveness to reduce CO 2 emissions depends on the CO 2 emission intensity factor of base load technologies, not on the system s average CO 2 emission intensity factor. The cost of RPSs is highly non-linear. A 10% RPS costs US$149 million A 20% RPS costs US$7,656 million (51 times larger)
5 Contents The basic economics of an RPS Assessment of RPSs in Chile Chile s Central Interconnected System The Emma Model Scenarios and results Why RPSs substitute investments in base load technologies.
6 The basic economics of an RPS
7 Chile s Central Interconnected System (CIS) Covers 92.2% of Chile s population. Total capacity: 12,147 MW (76% of Chile s total capacity.) Generation in 2012: 41.1% hydro, 20.8% gas, 26.6% coal, 7% oil, and 4.5% NCRE. Centralized marginal cost dispatch independent of contractual obligations. Long-run contracts. Private investors; the government does not build or plan generation capacity.
8 Supply curves in Chile s CIS
9 Emma ( Electricity, markets and the environment ) Multi-period partial equilibrium model of Chile s CIS (60 years). Taking existing capacity as given, supply is determined by the expected least cost investment and operation path. Marginal cost dispatch; optimal usage of Laja reservoir (inter-annual regulation capacity). Considers fuel price volatility through 4 equally likely price vectors and four possible hydrologies for each year. Emma minimizes Subject to producing the energy demanded each year, complying with renewable quotas and environmental standards, discrete supply curves, and the hydraulic balance of the Laja basin. Demand responds to price; three consumers with constant price-elasticity (-0.39); load duration curve has 6 blocks; demand grows at about 5% per year. Emma allows to internalize the social cost of power plant emissions (PM, NOx, SOx and CO2). Marginal damages from Cifuentes et al. (2010) and Nordhaus (2010). See GHMN (2012) for a full description.
10 Scenarios Baseline: No RPS + current emissions regulation. 10% RPS: 5% renewables in 2010, gradually increasing to 10% in (Chile s current RPS.) 20% RPS: 5% renewable in 2010, gradually increasing to 20% in (Approved in Chile s parliament; in discussion at the Senate) Uncontrolled emissions: No RPS, no emissions regulation. Optimal policy: technologies internalize their marginal damage.
11 CO 2 emissions (million tons per year)
12 Composition of generation
13 Economic outcomes (1) (2) (3) (4) (5) Baseline 10% RPS 20% RPS Uncontrolled emissions Optimal Cost of generation 57,931 58,154 59,785 56,228 56,619 Environmental costs 3,741 3,330 2,627 12,790 2,556 Total 61,672 61,485 62,412 69,019 59, ,114 9,049-1, ,281 6, , ,841-15,275 2,836-1, ,656-6,503 1, ,784 10, ,788-1,518 1, ,327 1, Generators profits 6,096 7,377 12,600 5,806 7,416
14 Why RPSs substitute investments in base load technologies?
15 The optimal technology mix (no RPS)
16 The optimal technology mix (with RPS)
17 What would happen if Chile didn t have cheap hydro? In this case the RPS reduces CO2 emissions. (Good news!) Nevertheless, the environmental benefit is much lower than the cost of the policy: Consumers lose about US$13 billion, generators win about US$9.9 billion (scarcity rent), and environmental costs decrease about US$ 2.5 billion. Overall, social surplus decrease about $US 4.5 billion.
18 What do we learn from all this? Supply curves of renewable energy are upward sloping. The impact of an RPS on welfare is non-linear; policy assessments must carefully estimate the supply curve of renewables. RPSs redistribute wealth from consumers to generators and also among generators. This effect can be large. Generation costs, even when externalities are included, are misleading indicators of the social cost of policies. RPSs substitute investments in base load technologies; therefore, they can be ineffective to reduce CO 2 emissions. Even if RPSs substitute carbon intensive technologies (like coal or diesel), it is only a fraction of the total emissions. (A carbon tax substitutes all coal generation for natural gas.)
19 Thank you! Cristián Hernández Universidad de los Andes, Santiago, Chile School of Business and Economics
20 References Bushnell, J., (2010), Building Blocks: Investment in Renewable and Non- Renewable Technologies, Energy Institute at Haas, Berkeley, California. Chao, H., (2011), Efficient Pricing and Investment in Electricity Markets with Intermittent Resources, Energy Policy 7, Cifuentes, L., De la Maza, C., Donoso, F., García, S., Flores, V. and L. Madrid, (2010), Análisis técnico-económico de la aplicación de una norma de emisión para termoeléctricas, mimeo. Galetovic, A., Hernández, C., Muñoz, C. and L.M. Neira, (2012), Are Renewable Portfolio Standards Effective to Reduce CO2 Emissions?. Submitted to Energy Economics. Nordhaus, W.D., (2010), Economic Aspects of Global Warming in a Post- Copenhagen Environment, Proceedings of the National Academy of Sciences of the United States of America 107, Renewable Energy Policy Network for the 21 st Century, (2011), Renewables 2011 Global Status Report. Paris.
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