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1. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Subsidies, Tariffs and Investments in the Solar
Power Market
Chrystie Burr
Department of Economics
University of Colorado at Boulder
April 26, 2014
1 / 33
2. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
“I’d put my money on the sun and solar energy. What a source
of power! I hope we don’t have to wait until oil and coal run
out before we tackle that.” -Thomas Edison, 1931 ”
”Photovoltaics are threatening to become the costliest mistake
in the history of German energy policy.” -Der Spiegel, July 4,
2012”
2 / 33
3. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Overview
• Solar power has experienced substantial growth in the U.S. since the
early 2000s. Total operating capacity has grown from 4 MW in
2000 to over 4,000 MW in 2011 while the International Energy
Agency projects it to grow to 68GW in 2035.
• The growth is driven by:
• Falling module costs: from costs $110/W in 1975 to $1/W in
2012
• Substantial public policy drivers and financial incentives
provided by federal, state, and local governments in the U.S.
and abroad:
• Capacity-based incentives: upfront buy-down programs
• Production-based incentives: Feed-in Tariffs (FITs),
net-metering rules
• Tax incentives: sales tax exemptions, federal renewable energy
tax credit
• Financing programs: property assessed clean energy financing
(PACE), solar leasing.
3 / 33
4. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Overview
• Solar power has experienced substantial growth in the U.S. since the
early 2000s. Total operating capacity has grown from 4 MW in
2000 to over 4,000 MW in 2011 while the International Energy
Agency projects it to grow to 68GW in 2035.
• The growth is driven by:
• Falling module costs: from costs $110/W in 1975 to $1/W in
2012
• Substantial public policy drivers and financial incentives
provided by federal, state, and local governments in the U.S.
and abroad:
• Capacity-based incentives: upfront buy-down programs
• Production-based incentives: Feed-in Tariffs (FITs),
net-metering rules
• Tax incentives: sales tax exemptions, federal renewable energy
tax credit
• Financing programs: property assessed clean energy financing
(PACE), solar leasing.
3 / 33
5. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Overview
• Solar power has experienced substantial growth in the U.S. since the
early 2000s. Total operating capacity has grown from 4 MW in
2000 to over 4,000 MW in 2011 while the International Energy
Agency projects it to grow to 68GW in 2035.
• The growth is driven by:
• Falling module costs: from costs $110/W in 1975 to $1/W in
2012
• Substantial public policy drivers and financial incentives
provided by federal, state, and local governments in the U.S.
and abroad:
• Capacity-based incentives: upfront buy-down programs
• Production-based incentives: Feed-in Tariffs (FITs),
net-metering rules
• Tax incentives: sales tax exemptions, federal renewable energy
tax credit
• Financing programs: property assessed clean energy financing
(PACE), solar leasing.
3 / 33
6. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Overview
• Solar power has experienced substantial growth in the U.S. since the
early 2000s. Total operating capacity has grown from 4 MW in
2000 to over 4,000 MW in 2011 while the International Energy
Agency projects it to grow to 68GW in 2035.
• The growth is driven by:
• Falling module costs: from costs $110/W in 1975 to $1/W in
2012
• Substantial public policy drivers and financial incentives
provided by federal, state, and local governments in the U.S.
and abroad:
• Capacity-based incentives: upfront buy-down programs
• Production-based incentives: Feed-in Tariffs (FITs),
net-metering rules
• Tax incentives: sales tax exemptions, federal renewable energy
tax credit
• Financing programs: property assessed clean energy financing
(PACE), solar leasing.
3 / 33
7. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Overview
• Solar power has experienced substantial growth in the U.S. since the
early 2000s. Total operating capacity has grown from 4 MW in
2000 to over 4,000 MW in 2011 while the International Energy
Agency projects it to grow to 68GW in 2035.
• The growth is driven by:
• Falling module costs: from costs $110/W in 1975 to $1/W in
2012
• Substantial public policy drivers and financial incentives
provided by federal, state, and local governments in the U.S.
and abroad:
• Capacity-based incentives: upfront buy-down programs
• Production-based incentives: Feed-in Tariffs (FITs),
net-metering rules
• Tax incentives: sales tax exemptions, federal renewable energy
tax credit
• Financing programs: property assessed clean energy financing
(PACE), solar leasing.
3 / 33
8. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Overview
• Solar power has experienced substantial growth in the U.S. since the
early 2000s. Total operating capacity has grown from 4 MW in
2000 to over 4,000 MW in 2011 while the International Energy
Agency projects it to grow to 68GW in 2035.
• The growth is driven by:
• Falling module costs: from costs $110/W in 1975 to $1/W in
2012
• Substantial public policy drivers and financial incentives
provided by federal, state, and local governments in the U.S.
and abroad:
• Capacity-based incentives: upfront buy-down programs
• Production-based incentives: Feed-in Tariffs (FITs),
net-metering rules
• Tax incentives: sales tax exemptions, federal renewable energy
tax credit
• Financing programs: property assessed clean energy financing
(PACE), solar leasing.
3 / 33
9. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
The Effect of Incentive Policies
Are public policies important?
• Germany accounted for 35.6% of worldwide installed capacities in
2011 despite its suboptimal geographical location. Refer to this map
• Invested over $11 billion through production subsidies in 2012.
• Within the U.S., New Jersey has the second largest solar market
(14%) despite its relatively low solar resources. Refer to this map
• This suggests that high subsidies lead to adoptions but at what
cost?
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10. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Research Agenda
The questions addressed in this study are:
• Evaluation of solar subsidy policies:
1 How to quantify the impact of solar incentive programs on the
growth of solar installations?
2 How to assess the relative efficiency of different subsidy
programs? What are the welfare costs of displacing GHGs
through these programs ?
3 How costly is it to encourage solar adoptions in suboptimal
locations?
• Impact of counterfactual policies:
1 What is the impact of the subsidy degression design? Is it
“better” than the common flat rate subsidies?
2 What would be the effect of lowering the current amount of
subsidies to match the $38/ton social cost of carbon suggested
by the Interagency Working Group (2013)? How much more
does it cost to double the number of current installations?
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11. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Research Agenda
The questions addressed in this study are:
• Evaluation of solar subsidy policies:
1 How to quantify the impact of solar incentive programs on the
growth of solar installations?
2 How to assess the relative efficiency of different subsidy
programs? What are the welfare costs of displacing GHGs
through these programs ?
3 How costly is it to encourage solar adoptions in suboptimal
locations?
• Impact of counterfactual policies:
1 What is the impact of the subsidy degression design? Is it
“better” than the common flat rate subsidies?
2 What would be the effect of lowering the current amount of
subsidies to match the $38/ton social cost of carbon suggested
by the Interagency Working Group (2013)? How much more
does it cost to double the number of current installations?
5 / 33
12. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Research Agenda
The questions addressed in this study are:
• Evaluation of solar subsidy policies:
1 How to quantify the impact of solar incentive programs on the
growth of solar installations?
2 How to assess the relative efficiency of different subsidy
programs? What are the welfare costs of displacing GHGs
through these programs ?
3 How costly is it to encourage solar adoptions in suboptimal
locations?
• Impact of counterfactual policies:
1 What is the impact of the subsidy degression design? Is it
“better” than the common flat rate subsidies?
2 What would be the effect of lowering the current amount of
subsidies to match the $38/ton social cost of carbon suggested
by the Interagency Working Group (2013)? How much more
does it cost to double the number of current installations?
5 / 33
13. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Research Agenda
The questions addressed in this study are:
• Evaluation of solar subsidy policies:
1 How to quantify the impact of solar incentive programs on the
growth of solar installations?
2 How to assess the relative efficiency of different subsidy
programs? What are the welfare costs of displacing GHGs
through these programs ?
3 How costly is it to encourage solar adoptions in suboptimal
locations?
• Impact of counterfactual policies:
1 What is the impact of the subsidy degression design? Is it
“better” than the common flat rate subsidies?
2 What would be the effect of lowering the current amount of
subsidies to match the $38/ton social cost of carbon suggested
by the Interagency Working Group (2013)? How much more
does it cost to double the number of current installations?
5 / 33
14. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Research Agenda
The questions addressed in this study are:
• Evaluation of solar subsidy policies:
1 How to quantify the impact of solar incentive programs on the
growth of solar installations?
2 How to assess the relative efficiency of different subsidy
programs? What are the welfare costs of displacing GHGs
through these programs ?
3 How costly is it to encourage solar adoptions in suboptimal
locations?
• Impact of counterfactual policies:
1 What is the impact of the subsidy degression design? Is it
“better” than the common flat rate subsidies?
2 What would be the effect of lowering the current amount of
subsidies to match the $38/ton social cost of carbon suggested
by the Interagency Working Group (2013)? How much more
does it cost to double the number of current installations?
5 / 33
15. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Research Agenda
The questions addressed in this study are:
• Evaluation of solar subsidy policies:
1 How to quantify the impact of solar incentive programs on the
growth of solar installations?
2 How to assess the relative efficiency of different subsidy
programs? What are the welfare costs of displacing GHGs
through these programs ?
3 How costly is it to encourage solar adoptions in suboptimal
locations?
• Impact of counterfactual policies:
1 What is the impact of the subsidy degression design? Is it
“better” than the common flat rate subsidies?
2 What would be the effect of lowering the current amount of
subsidies to match the $38/ton social cost of carbon suggested
by the Interagency Working Group (2013)? How much more
does it cost to double the number of current installations?
5 / 33
16. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Methodology
• I develop a dynamic structural model to estimate consumer demand
for solar panels and apply the model to evaluate the effect of
capacity-based subsidies, production revenue, tax credits and
upfront system costs.
• Why structural?
• To conduct counterfactual analysis
• To conduct welfare analysis taking into account the change in
consumer’s surplus associated with the policy change
• Why dynamics?
• To capture the consumer’s expectation of falling panel prices
and reduction in subsidies.
• To provide a realistic model of consumers’ investment
decisions in a durable goods market.
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17. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Relationship to other studies
1 Theoretical and simulation studies on instrument choice in
environmental regulations
• Kneese and Bower (1968), Keohane et al. (1998), Goulder and
Parry (2008), Fischer and Newell (2008)
2 Empirical studies of the California solar market
• Bollinger and Gillingham (2012), Dastrup et al. (2012),
Hughes and Podolefsky (2014)
3 Methodology: Single agent optimal stopping model aggregate to
the market level
• Rust (1987), BLP (1995)
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18. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Relationship to other studies
1 Theoretical and simulation studies on instrument choice in
environmental regulations
• Kneese and Bower (1968), Keohane et al. (1998), Goulder and
Parry (2008), Fischer and Newell (2008)
2 Empirical studies of the California solar market
• Bollinger and Gillingham (2012), Dastrup et al. (2012),
Hughes and Podolefsky (2014)
3 Methodology: Single agent optimal stopping model aggregate to
the market level
• Rust (1987), BLP (1995)
7 / 33
19. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Relationship to other studies
1 Theoretical and simulation studies on instrument choice in
environmental regulations
• Kneese and Bower (1968), Keohane et al. (1998), Goulder and
Parry (2008), Fischer and Newell (2008)
2 Empirical studies of the California solar market
• Bollinger and Gillingham (2012), Dastrup et al. (2012),
Hughes and Podolefsky (2014)
3 Methodology: Single agent optimal stopping model aggregate to
the market level
• Rust (1987), BLP (1995)
7 / 33
20. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Market and Institution
California Solar Initiative Program
• Started in January 2007 seeking to install ∼2GW of PV capacity in
10 years with program funding of $2 billion.
• It provides financial incentives to customers of Investor-Owned
Utilities (IOUs):
• Residential users (size < 30kW) receive a one-time, up-front
payment based on the expected performance of the system.
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21. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Preview of Results
• Production-based subsidies are more efficient than capacity-based
subsidies because they encourage adoptions in sunnier locations.
• Total subsidies in CA would be welfare neutral with a $108/ton
social cost of carbon (at the end of the sampling period).
• If CA has the same solar resource as in Frankfurt, Germany, and to
produce the same level of electricity as in the factual world, the
welfare neutral CO2 price is at $730/ton.
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22. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Household decision model
Household’s Decision to Install a Solar Power System
• Each month, households (non-installers) make the following choice:
• Each household observes
1 price of solar power system (p)
2 capacity-based subsidy (s)
3 profit associated with life-time solar electricity production
revenue, O&M cost and inverter replacement cost (r)
4 federal tax credit (τ)
• Households choose either to install solar PV (d = 1) or stay
with the current utility/electricity setup (d = 0)
• After installations, the household leaves the market.
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23. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Household decision model
• Per period utility is determined by the state variables:
X = {p, s, r, τ} and , iid random variables follow a type I extreme
value distribution:
u(X, d, , θ) = ν(X, d, θ) + (d)
where
ν(X, 1, θ) =θ0 + θ1p + θ2s + θ3r + θ4τ spec. (I)
ν(X, 1, θ) =θ0 + θ1(p − s) + θ2r + θ3τ spec. (I)
ν(X, 1, θ) =θ0 + θ1(p + s + r + τ) spec. (II)
ν(X, 0, θ) =0 for both specs
• Household solves the Bellman equation:
Vθ(X, ) = max
d={0,1}
(0) + β
EVθ(X,1)
X
Vθ(X , )p(X |X)p( |X )dX d ,
ν(X, 1; θ) + (1)
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24. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Household decision model
• Per period utility is determined by the state variables:
X = {p, s, r, τ} and , iid random variables follow a type I extreme
value distribution:
u(X, d, , θ) = ν(X, d, θ) + (d)
where
ν(X, 1, θ) =θ0 + θ1p + θ2s + θ3r + θ4τ spec. (I)
ν(X, 1, θ) =θ0 + θ1(p − s) + θ2r + θ3τ spec. (I)
ν(X, 1, θ) =θ0 + θ1(p + s + r + τ) spec. (II)
ν(X, 0, θ) =0 for both specs
• Household solves the Bellman equation:
Vθ(X, ) = max
d={0,1}
(0) + β
EVθ(X,1)
X
Vθ(X , )p(X |X)p( |X )dX d ,
ν(X, 1; θ) + (1)
11 / 33
25. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Household decision model
• The likelihood of observing data {Xz
t, di
t} for household i in zip
code z is
i(Xi
; θ) =
T
t=2
P di
t|Xz
t ; θ p Xz
t |Xz
t−1
• where P (d|X; θ) is the conditional choice probability:
P(d|X; θ) =
exp{ν(X, d, θ) + EVθ(X, d)}
d∈{0,1}
exp{ν(X, d, θ) + EVθ(X, d)}
• The log-likelihood function over the whole dataset is then:
Lθ = log θ =
z iz t
log P(di
t|Xz
t ; θ) +
z iz t
log p(Xz
t |Xz
t−1)
=0 perfect foresight assumption
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26. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Data Summary
Data Summary
• Time periods: January 2007 - March 2012
• Data cover 9 counties, 344 zip codes
• 2 million owner-occupied households, made 28,103 observed
installations during this period.
Variable Mean Std. Dev. Min Max Obs.
System price 44,702 4,212 34,122 51,318 21,861
Upfront subsidy 8,083 4,516 1,398 13,975 21,861
Revenue (5%) 19,578 1,649 16,729 25,585 21,861
O&M costs (5%) 4,809 113.4 4,533 4,986 21,861
Tax credit 8,071 4,835 2000 14,193 21,861
Irradiation 5.55 0.28 5.08 6.57 21,861
# installations 1.29 2.26 0 42 21,861
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27. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Data Summary
Consumer forward looking behavior
*The red dotted lines indicate one period before a reduction in subsidy amount.
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28. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Estimation Results
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29. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
The Break-Even Carbon Price
• Assume a perfectly elastic supply industry, so total loss in surplus
equals program spending adjusted by the change in consumer
surplus.
• The welfare neutral CO2 price is
PCO2
=
G − CS
γ × Q
(1)
• G: total government spending
• γ: amount of CO2 displaced by the solar power system
• Q: number of installations
• CS: consumer surplus
CS(X) =
1
θ
log eβEV (X)
+ eν(X)
× M (2)
• M: market size
• X: Current state
• θ: marginal utility of income
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30. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
The Break-Even Carbon Price
(subsidies at the last sampling period, 3% discount rate)
Without subsidies With subsidies
# first month adopter 424 753
Change in total adoptions. 38%
Subsidy amount 11k - 14k
Government Spending $2.80 billion
Change in CS $2.28 billion
Implied CO2 price
SCE $111
PG&E $91
SDG&E $87
Overall $95
*All dollar values are in 2012 dollars
17 / 33
31. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Loss in Surplus from Suboptimal Siting
• If California were as sunny as in Frankfurt, Germany, then how
expensive would be the solar subsidy programs?
Baseline Frankfurt Irrad. Frankfurt Irrad. Frankfurt Irrad.
(California) same # install. same elec. prod.
Change in purchase prob. 77-86% 80-87% 96-98% 98-99%
Total Installations 777,180 171,508 777,274 1,334,322
Change in total adoptions 62% 65% 81% 90%
Total electricity prod. 140 TWh 39 TWh 56 TWh 140 TWh
Capacity-based subsidy $0.25/W - $0.65/W $0.25/W - $0.65/W $7094.53+ tax credit $18,153 + tax credit
Government spending 0.8 billion 0.4 billion 1.3 billion 5.8 billion
Change in CS 0.5 billion 0.2 billion 0.6 billion 2.0 billion
CO2 price (per tons) $118.1 $236.6 $418.4 $730.1
18 / 33
32. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Efficiency Comparison
• Comparing the welfare costs between a capacity-based subsidy and
a production-based subsidy
Capacity-based Feed-in Tariff
Total Installations 979,244 979,244
Total electricity prod. 163 TWh 189 TWh
Per unit Subsidy $1.1/W+tax credits +7.93¢/kWh +tax credits
Government spending 1.7 billion 1.7 billion
Change in CS 0.9 billion 0.9 billion
Implied CO2 price
SCE $167 $171
PG&E $173 $170
SDG&E $165 $167
CO2 price (per tons) $169.3 $169.1
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33. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Efficiency Comparison
• Comparing the welfare costs between a capacity-based subsidy and
a production-based subsidy (NJ solar irradiation in N. CA)
Capacity-based Feed-in Tariff
Total Installations 921,909 921,909
Total electricity prod. 121 TWh 122 TWh
Per unit Subsidy $1.1/W+tax credits +8.45¢/kWh +tax credits
Government spending 1.5 billion 1.5 billion
Change in CS 0.9 billion 0.8 billion
Implied CO2 price
SCE $167 $176
PG&E $201 $191
SDG&E $165 $171
CO2 price (per tons) $180.6 $179.9
20 / 33
34. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Efficiency Comparison
• Comparing the welfare costs between a capacity-based subsidy and
a production-based subsidy (AK solar irr. in N. CA, AZ solar irr. in
S. CA )
Capacity-based Feed-in Tariff
Total Installations 859,358 859,358
Total electricity prod. 109 TWh 114 TWh
Per unit Subsidy $1.1/W+tax credits +8.94¢/kWh +tax credits
Government spending 1.4 billion 1.5 billion
Change in CS 0.7 billion 0.8 billion
Implied CO2 price
SCE $159 $176
PG&E $297 $249
SDG&E $150 $167
CO2 price (per tons) $184.5 $182.2
21 / 33
35. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Capacity vs. Production Subsidy
(Flat-rate Capacity-Based Subsidy)
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36. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Capacity vs. Production Subsidy
(FIT with Greater Solar Disparity Between North and South)
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37. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Welfare analysis
Comparison of the Subsidy Degression and the Equivalent
Flat-rate Subsidy
Taking system prices as exogenous, overall installations would be 15%
higher under the flat-rate design and the welfare cost would be lower.
24 / 33
38. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Impact from changes in Policy
Impacts from Varying Incentive Levels
• Match the $38/ton ($42.08 in 2012 $) social cost of carbon
(Interagency Working Group, 2013)
• Doubling the current installations
Current Lowering sub. Doubling install.
Total Installations 722,829 583,685 1,445,464
% change in adoptions 38% 23% 69%
Total electricity prod. 140 TWh 26.5 TWh 193 TWh
Upfront subsidy $0.25-$0.65/W + tax credits $1.114/W 22k
Government spending 2.8 billion 1.2 billion 20.7 billion
Change in CS 2.3 billion 1.1 billion 12.2 billioin
Equivalent CO2 price $96 $42.08 $342.8
25 / 33
39. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Conclusions & Extensions
• The dynamic consumer PV demand model is versatile and can
provide quantitative evaluations of potential policy changes.
• Encouraging solar adoptions in sunny locations can reduce the
welfare costs of the incentive programs.
• Policy makers may prefer to provide production-based subsidies
instead of capacity-based subsidies to encourage the adoption of
solar power systems for the gains in efficiency.
• The declining schedule of the subsidy design does encourage more
adoption earlier on, however the equivalent flat-rate design would
have encouraged more adoptions at a lower welfare cost.
26 / 33
40. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Map of Solar Resource in US, Germany and Spain
Back
27 / 33
41. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Cumulative Installed Capacity in the US States
Back
28 / 33
42. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Effect of Lifting the $2000 Tax Credit Cap
Back
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43. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Geographical distribution of installations in California
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44. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
System size distribution over the years
Back
31 / 33
45. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
PV module price trend
Back
32 / 33
46. Introduction Model Data Results Counterfactuals Conclusions & Extensions Appendix
Data Correlations
33 / 33