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Investigation of Japanese electricity industry using a CGE model of translog function
Journal of Economic Structures volume 8, Article number: 20 (2019)
Abstract
CGE models are usually used for policy analysis. The conventional CGE models use CES function because of being a convenience for modeling. Moreover, some of the CGE models use a multiCES function to model the multilayered production process. These multilayered CES functions are frequently used in the energy and environmental policy analysis. However, the CES function is rigid for considering various substitution–complement relationships. In this regard, this study suggests another type of CGE model that uses the translog function for modeling of power generation. Taking the model into practice, we analyze the effects of the carbon tax on power generation in substitution and complement scenarios, as an application. We compare three carbon tax scenarios (289 Yen as BAU, 600 Yen, and 2000 Yen/CO_{2} ton) to investigate the impact of carbon tax on power generation. The results of the simulation show that industrial production decreases and substitution of the power sources for thermal power generation being significant in response to a carbon tax increase. Moreover, the result suggests that the translog function model is available for analysis of electricity industry under environmental policies.
Introduction
Recently, the share of renewable energy, e.g., photovoltaic, is increasing in power generation. Restriction of nuclear power generation in many countries in the world, which is triggered by Fukushima Daiichi accident in 2011, activated the discussion to supply massive power with renewable energy because it has low carbon emission and low risk. However, technological and economic restrictions are a barrier to making the electricity system with highly penetrated renewable energy. For example, in Japan, Kyushu Electric Power Company (KEPC) restricted connecting renewable energy power plants into its network to prevent blackouts (The Mainichi Newspaper 2018). KEPC’s restriction shows that the massive installation of renewable energy makes the grid unstable. KEPC’s restriction for renewable energy implies that the design of an ideal power supply system requires some challenges. In this context, the power supply is conducted by elaborately controlled energy mix.
Many literatures concerning energy policy use CGE analysis (e.g., Wissema and Dellink 2007; Aydin and Acar 2010; He et al. 2010; Danno et al. 2013; Guo et al. 2014; Hwang and Lee 2015; Benavente 2016; Peters 2016a, b; Yun et al. 2016; Tang et al. 2017; Li and Su 2017; Zhang et al. 2017). Generally, the CGE model has been using CES function, since the CES function is easy to use to make an economic model. Specifically, CES function easily describes substitutes relationship among the inputs or commodities. However, the CES function is not flexible enough to make a more realistic model. In the situation where renewable energy is primarily installed in a power generation system, volatility of renewable energy can generate an additional cost of grid stabilization. In the economic perspective, as KEPC’s example implies, the additional cost of grid stabilization makes a difference between 1 kWh from thermal or nuclear and 1 kWh from renewable energy. CES function model hardly addresses this delicate situation, because of its rigidity. Our approach relaxes the strict assumption on the substitution pattern imposed by the CES function which can be adapted to the grid analysis.
In this context, the purpose of this work is to develop a CGE model based on the translog function to investigate the issue of the energy mix in the power supply system. Moreover, as an application of the suggested model, we investigate the effects of the carbon tax on the electricity industry. Barbe (2014), referring Wilcoxen (1988) and Jorgenson and Yun (2001), introduced the CGE model that model the production using multilayered translog cost function. This study focuses on the power supply which is merely concerned by Barbe (2014) and analyzes the effect of carbon tax on Japanese power generation in substitution–complement scenarios. Although the results are not the final answer to energy policy design concerning power supply or grid stabilization, this paper contributes to the literature as a useful framework of the further related researches.
This article consists of five sections. First, we show the CGE model in Sect. 2. The CGE model is based on the Waseda university’s expanded input–output table designed from Japanese input–output table in 2005. The Waseda university’s input–output table segmented power generation industry. Moreover, the entire framework of my CGE model is based on Danno et al. (2013). The estimated parameters of the model are shown in Sect. 3. In Sect. 4, we present the simulated results and discuss the results. Finally, Sect. 5 draws some conclusions about the meaning of the results and the contribution of the paper and discusses remained challenges.
Method
Data preparation
The extended input–output table for analysis of nextgeneration energy system complied Waseda university is used.^{Footnote 1} This study aggregates the 124 sectors of the original table into 16 sectors. Moreover, the original table segments electricity industry into eight sectors including transmission sector, we aggregated these into five sectors, these are the transmission, nuclear, thermal, hydro, and renewable energy. These five sectors are subsectors of the electricity industry (Table 1).
The social accounting matrix (SAM) created for the simulation is based on the mentioned Waseda university’s input–output table. Note that some elements in the SAM are adjusted before simulation. While each power generation sector directly supplies electricity to industries and final demands in the original input–output table, we assume that only the transmission subsector supplies electricity because it is more realistic. Therefore, electricity from the four power generation subsectors is aggregated into the transmission subsector. Inversely, the transmission subsector is assumed that it does not produce valueadded. Thus, labor and capital input into the transmission subsector in the original data set are distributed to the four power generation subsectors, i.e., nuclear, thermal, hydro, and renewable energy.
Moreover, the intermediate inputs into the transmission subsector are also distributed to the four power generation subsectors, because the transmission subsector is in charged only of collecting generated electricity from the power generation subsectors and supplying to the demands including intermediates. We also should note that the four power generation subsectors deal only with the transmission subsector and there are no transactions between power generation and other industries and final demand in this model. Therefore, the rawcolumn balance in the four power generation subsectors is not considered.
Supply side
The production in the model consists of three stages (see Fig. 1). Firstly, the four power generation subsectors, S122 to S125, generate electricity using labor, capital, and intermediates including fuels. Secondly, the transmission subsector, S121, collects electricity from the power generations and distributes to the industries and the final demands. Thirdly, other eleven industrial sectors, S01–S11, produce using intermediates including electricity, labor, and capital inputs and supply their output to meet the demands.
Electricity generation
According to the framework of Input–Output analysis, production costs of electricity generation subsectors are given by the function
where the subscripts \(h = N, T, H, R\) indicate power generation using nuclear, thermal, hydro, and renewable energy, respectively, and \(n = 1{}12\) indicate industrial sectors from the agriculture and fishing (S01) to the transmission (S121). Moreover, \(V\) is valueadded that is produced by labor and capital input, \(a_{nh}\) is the input coefficient of sector \(h\) from \(n\), and \(p_{Qn}\) is the domestic market price of the nth commodity. The electricity generated by each subsector, \(Z_{h}\), is assumed to be produced by the Leontief technology. Then, the producer’s price of electricity, \(p_{Zh}\), is determined by
where \(a_{Vh} = V_{h} /Z_{h}\) is the valueadded rate of the power generation subsector h, \(p_{Vh}\) is valueadded deflator of the power generation subsector h.^{Footnote 2} Valueadded is produced following the Cobb–Douglas production function.
Here, the capital input is calculated from profitmaximizing conducted with valueadded as follows.
where \(K\) is capital input, \(p_{K}\) is the price of capital. Labor input is also derived as the same equation with Eq. (4).
Transmission
The transmission subsector is devoted to the distribution of electricity that is received from power generation subsectors. Then, the output of transmission subsector, Ze, is measured by the amounts of electricity sent to final customers, while its inputs are electricity generated by four sources, i.e., Z_{N}, Z_{T}, Z_{H}, and Z_{R}. Assuming the technology exhibits constant returns to scale, we have the unit cost function of the transmission subsector as
where p_{zi}, i = e, N, T, H, R, are the corresponding unit cost of electricity. Behind Eq. (5), transmission subsector is assumed to minimize total transmission costs subject to technological restrictions given by (5). Equation (5) represents the intersource substitutability and complementarity of electricity that are due to maintaining the stability of network in voltage and frequency at any moment. Since the unit cost function is linearly homogeneous in the unit costs of inputs, applying the Shephard’s lemma to Eq. (5) yields
We employ the translog form to specialize Eq. (5) as^{Footnote 3}
where \(\tau_{Zh}\) and \(\tau_{Ch}\) are indirect tax rate and carbon tax rate on power source h, respectively. The Shephard’s lemma is applied to Eq. (7) to obtain the following cost share equations
where \(S_{h}\) is defined as \(\left( {1 + \tau_{Zh} + \tau_{Ch} } \right)p_{Zh} Z_{h} /\mathop \sum \nolimits_{h'} p_{Zh'} Z_{h'}\). Then, the amount of electricity generated by each source is described as
Although most of the previous CGE studies employ the CES function, the CES form does not allow complementary relationships among inputs. In this paper, we consider the possibility of complementarity among power sources, for example, complementarity between renewable energy and nuclear power as well as substitutability. We thus prefer more flexible translog form over CES function to model technological restrictions imposed on the operation of the electric power system.
Industry sectors except for power generation and transmission
The production of industrial sectors except the electricity is modeled by Leontief technology. The following two equations are basically the same as Eqs. (1) and (2). That is,
where, \(i,j = {\text{S}}01{}{\text{S}}11\) is industrial sectors except electricity related. Their producer’s price, \(p_{Zi}\), is
The meaning of each parameter in Eqs. (10) and (11) is the same within Eqs. (1) and (2). Moreover, labor, capital, and production of valueadded of ith sector follow the Cobb–Douglas technology as Eqs. (3) and (4).
Distribution of production into the domestic market and export
This study assumes that domestic supply and export are not perfect substitutes. Under the imperfect substitution, nth output, \(Z_{n}\), follows a CET function shown as Eq. (12) and supply to domestic market, \({\text{DS}}_{n}\), and export, \({\text{EX}}_{n}\), are derived from profit maximization as Eqs. (13) and (14).
where \(\tau_{{Zn}}\) and \(\tau_{{Cn}}\) are indirect tax rate and carbon tax rate imposed on the nth production process, respectively. We should note that \(\tau_{{Zn}}\) and \(\tau_{{Cn}}\) on transmission subsector, n = S121, is zero. \(p_{{Dn}}\) and \(p_{{En}}\) are domestic price and export price of the nth commodity, respectively. \(\theta_{n}\), \(\phi_{n}\), \(\xi_{{Dn}}\), and \(\xi_{{En}}\) are parameters. \(\phi_{n}\) is statistically estimated by using the annual SNA input–output table^{Footnote 4} reported by Cabinet office of Japan from 2001 to 2013. Other parameters are set to satisfy the data set, SAM in 2005 based on the Waseda university’s input–output table.
Demandside
Government behavior
Revenue of government consists of income tax imposed on households, indirect tax and carbon tax imposed on the production process, and import tariff, as shown in Eq. (15).
Firstly, CAS is a currentaccount surplus in 2005 reflected in government fiscal accounting to balance the sum of rows and columns in SAM, as mentioned in Sect. 2.1, and CAS is fixed in this simulation. IT is household income tax. Since household income is accrued from supplying labor and capital inputs to the eleven industrial sectors the four power generation subsectors, we then have the following equation.
\(\tau_{H}\) is the income tax rate. IDT is an indirect tax and calculated as follows.
CT means a total carbon tax. Generally, a carbon tax is imposed on carbon (C) emission, not on carbon dioxide (CO_{2}). In this study, however, a carbon tax is assumed to be imposed on CO_{2} emission because of lack of available data. Moreover, CO_{2} emission in Japan is assumed in our model to emit stems from fossil fuel input. Since final demand for fossil fuel is negligible compared to intermediate input in the original data, CO_{2} emission is calculated from only an intermediate input of fossil in the suggested model. According to Greenhouse gas Inventory Office of Japan (GIO),^{Footnote 5} CO_{2} emission in 2005 is 1290 million ton (Mton). Therefore, CO_{2} emission per unit input of fossil fuel (ton/Yen) is,
where subscript number 2 indicates the fossil fuel sector and \(Z0_{n}\) is the initial value of output (million Yen) of each industrial sector. Thus, the denominator of the righthand side of Eq. (18) is the total intermediate input of fossil fuel.
Based on Eq. (18), CO_{2} emission per unit production of nth industry (ton/Yen) is,
Moreover, the carbon tax rate on the nth industry, \(\tau_{Cn}\), is obtained by multiplying \({\text{CO}}_{{ 2_{n} }}\) in Eq. (19) and carbon tax per unit emission (Yen/ton). From these, the total carbon tax, CT, in Eq. (15) is derived by summation of the carbon tax on each sector.
Finally, the import tariff, IMT, is,
where \(\tau_{{Mn}}\) is import tariff rate of the nth commodity, \(p_{\rm{Mn}}\) is import price, and \({\rm{IM}}_{n}\) is an import, respectively. Government consumes based on the tax income as follows.
where \(C_{{Gn}}\) is the government’s demand for the nth commodity, \(\alpha_{{Gn}}\) is government consumption rate for the nth commodity, and \(s_{G}\) is government saving rate, respectively.
Household behavior
Households’ income consists of wage and capital income. Households’ consume commodities based on their disposable income that is the rest of total income subtracted income tax and savings. Households’ consumption behavior is based on their utility maximization, and the utility function is shown as following Cobb–Douglas function.
where \(U\) is households’ utility, \(C_{{Hn}}\) is households’ consumption for the nth commodity, and \(\alpha_{{Hn}}\) is the ratio of the demand for the nth commodity to households’ total demand. From Eq. (23), \(C_{{Hn}}\) is derived as following Eq. (24) by utility maximization.
where \(s_{H}\) is the households’ saving rate.
Investment behavior
This study assumes that investment behavior is based on the total saving of the economy. Total saving of the economy consists of government’s saving, the households’ saving, and foreign saving which indicates a currentaccount deficit. First, the government’s saving and households’ saving are,
Moreover, currentaccount balancing is,
where \(p_{{En}}^{W}\) is the export price of the nth commodity in terms of dollar, \(p_{{Mn}}^{W}\) is import price in terms of dollar, and \(S_{f}\) is foreign saving, i.e., currentaccount deficit, in terms of the dollar. From above, the total savings of the economy is,
\(\varepsilon\) in Eq. (28) is the exchange rate (Yen/Dollar). Investment for the nth industry is,
Allocation of total demand for the domestic commodity and imported commodity
Total demand for the nth commodity, \(Q_{n}\), consists of households’ consumption, government’s consumption, investment, and intermediate input.
This paper assumes the demand for the imported commodity and domestic commodity are imperfect substitution similar to Sect. 2.2.4. Based on this assumption, \(Q_{n}\) is shown as the following Eq. (31), an Armington function. Moreover, the demand for the domestic commodity, \({\text{DS}}_{n}\), and the demand for the imported commodity, \({\text{IM}}_{n}\), can be obtained from profit maximization.
\(\gamma_{n}\), \(\delta_{{Dn}}\), \(\delta_{{Mn}}\), and \(\eta_{n}\) are parameters. \(\eta_{n}\), like as \(\phi_{n}\) in Eqs. (12)–(14), is estimated from the SNA input–output table reported by Cabinet office of Japan from 2001 to 2013. Other 3 parameters are determined to satisfy the original data set, the expanded input–output table in 2005.
Parameter determination
Parameter estimation of CES function
As mentioned, parameters \(\phi_{n}\) and \(\eta_{n}\) are estimated from SNA input–output table of Cabinet office of Japan using OLS estimation. The estimated results are shown in Tables 2 and 3. Note that the values of the construction sector (S08), the gasheatwaterwaste sector (S10), and the electricity (S12) are arbitrarily set to prevent 0 divided, because the export and import of these three sectors are null or negligibly small.
Parameter determination of translog function
This study uses Allen elasticity of substitution to investigate the effect of carbon tax on the power generation in the substitution–complement relationship between renewable energy and other conventional power sources. We can obtain the ownprice and crossprice Allen elasticity of substitution from the initial value, expanded input–output table in 2005.
where \(S_{h}^{0}\) is initial cost share of the hth power source. Two inputs are substitutes (complements) when Allen elasticity of substitution is positive (negative), and Allen elasticity of substitution are given exogenously. The exogenous Allen elasticity of substitution is shown in Table 4. Then, we can calculate \(\beta_{h'h}\) and \(\beta_{hh}\) in Eqs. (34) and (35) from exogenous Allen elasticity of substitution and initial cost share. Finally, to simplify the determination of parameter \(\alpha_{h}\), we assume that the logarithm term in Eq. (8) is zero in the initial condition. Then, we have
Results and discussion
In order to investigate the robustness of the model, a sensitivity test for the parameter of the translog function (see Eq. (7)) is conducted. For the sensitivity test, the parameter value is adjusted as 10% up/down and 5% up/down. The robustness of the model is confirmed as the optimal solutions are merely changed. Therefore, we regard the model stable and proceed scenario analysis. For the results of the sensitivity text, see “Appendix A”.
Simulation description
As mentioned in Sect. 1, the effect of carbon tax on power generation is analyzed using suggested CGE model in a substitution scenario and a complement scenario, as an application of the model. For carbon tax, three carbon tax scenarios are assumed, that is 289 Yen/CO_{2} ton, 600 Yen/CO_{2} ton, and 2000 Yen/CO_{2} ton, respectively. The Japanese government is already imposing carbon tax named ‘Global warming countermeasure tax,’ as 289 Yen/CO_{2} ton (Ministry of Environment of Japan). Therefore, three carbon tax scenarios indicate business as usual (BAU), two times of present, and seven times of present, respectively. Since other literature (e.g., Benavente 2016) test their model assuming carbon tax higher than 50 US dollar per ton, our suggesting carbon tax scenarios are reasonable.
Scenario 1 in Table 4 is substitution scenario. Firstly, the substitutability between thermal and nuclear, thermal and hydro, and nuclear and hydro are 1.25. The elasticity of substitution between renewable energy and nuclear, and renewable energy and hydro is 2.50. Only the value between thermal and renewable energy is high, 5.00.
Scenario 2 in Table 4 shows a complementary scenario. In this case, the relationship among the three conventional power sources and between thermal power generation and renewable energy is substituted as scenario 1. The only difference is the elasticity of substitution of renewable energy for nuclear power and hydropower (these are − 2.50). This case means that nuclear and hydropower generation act as backup loads for renewable energy, while renewable energy acts as a base load in scenario 1.
Simulation results
Since the change of production of 11 industrial sectors under the three carbon tax scenarios is similar in substitution and complement cases, in this section, the discussion for the 11 industrial sectors in complement scenario is omitted. As shown in Table 5 and Fig. 2, productions of sectors except for other services (S11) are reduced by the carbon tax, and the reduction rate becomes more prominent as the carbon tax increasing. This is consistent with other literature concerning carbon tax. The increase in production of other services (S11) can be attributed to the additional government revenue from the carbon tax since the government’s consumption for other services is substantial.
The result shows that carbon tax induces the substitution of power sources for thermal power generation (see scenario 1 in Table 6 and Fig. 3). The substitution becomes significant as carbon tax increasing. For example, thermal power generation is decreased by 0.391%, and nuclear, hydro and renewable energy are increased by 0.463%, 0.505%, and 2.304%, respectively, in BAU case, while it becomes remarkable by 2000 Yen/CO2 ton of carbon tax (nuclear 3.194%, thermal − 2.658%, hydro 3.484%, and renewable 16.038%, respectively). Despite the substitution, the total production of the electricity industry is decreased, because the share of thermal power generation is the biggest among the power sources.
In the complementary scenario (scenario 2), substitution of renewable energy for thermal power generation is less than that in the substitution scenario (scenario 1). On the other hand, the change rate of nuclear and hydro in power generation becomes higher (see scenario 2 in Table 6 and Fig. 4). As mentioned, scenario 2 indicates that nuclear and hydropower generation is backup loads for renewable energy. Therefore, this result shows that the capacity expansion of backup loads is necessary to increase renewable energy use. Carbon tax induces substitution of renewable energy for thermal power generation, and renewable energy use in power generation increases. In scenario 2, the expansion of renewable energy requires nuclear and hydropower generation as its backup. Thus, a part of the substitution of renewable energy is shifted.
Change in GDP and CO_{2} emission
Table 7 shows that the changes in GDP in all cases are negligible. This is attributed to firstly, compensation of the government consumption for other services (S11) to the negative effect of carbon tax on the production (i.e., demand reduction caused by the increase in cost), and secondly, substitution of the increase in labor and capital input for the reduction in the production.
Figure 5 shows that carbon tax merely reduces CO_{2} emission in the entire economy in both scenarios. Even in the case of 2000 Yen/CO_{2} ton, CO_{2} emission is reduced by only 1.8%. This implies that in Japan, a carbon tax is not an effective policy for CO_{2} reduction. Japan is technologically progressed country. Therefore, it seems that this result implies effective production in the perspective of CO_{2} emission may have achieved, even in 2005. Thus, other policies, for example, emission trading, are necessary to accomplish the emission target.
Conclusion
This paper suggests another type of CGE model that uses the translog function for modeling of power generation. As an application of the suggested model, the effects of the carbon tax on power generation in substitution and complement scenarios are investigated. To investigate the carbon tax effect in each case, three carbon tax scenarios (289 Yen as BAU, 600 Yen, and 2000 Yen/CO_{2} ton) are compared. The results of the simulation show that industrial production is decreasing and substitution of the power sources for thermal power generation is significant as the carbon tax increases. Moreover, the result suggests that the translog function model is available for analysis of electricity industry under environmental policies.
Table 6, Figs. 3 and 4 show small differences between scenario 1 (substitution) and scenario 2 (complement). This paper does not assume extremely high or low elasticity of substitution among the power source. Therefore, the results are shown in this study reflect a realistic situation, and these small differences do not undermine the value of our model. Above all, while the multilayered CES model needs assumptions about the aggregate structure, the translog model does not, because this is second order Taylor approximation of any function.
The major contribution of this is to introduce flexible translog function in the CGE modeling of power generation sectors. However, there are some challenges to the improvement in this model in further work. Firstly, the physical and economic characteristics of power sources should be reflected in the unit costs of power generation more accurately. For example, the nuclear power is not backup loads for renewable energy if we consider the maintenance cost or shut down cost. By considering the characteristics of each power source, including environmental loads, the results in this paper is changeable and improvable. Secondly, this study uses the arbitrarily given elasticity of substitution. The estimation or observation of real elasticity of substitution among the power sources may be helpful.
Despite these challenges, the model is valuable in various researches of energy and environmental policy analysis as a flexible framework of policy studies. It is expected that the enhanced translog model can help to make realistic energy and environmental policies. The suggested translog function model can be used for other environmental researches. For example, we can investigate the effect of generation price increase in a power source on the electricity industry. Attempts to apply the translog function to various CGE modeling and policy analysis will improve the performance.
Availability of data and materials
The expanded input–output table used in this article can be found at the website of Institute for Economic Analysis of Nextgeneration Science and Technology of Waseda University.
Notes
 1.
Extended renewable energy sectors for 2005, Institute for Economic Analysis of Nextgeneration Science and Technology, Waseda University http://www.f.waseda.jp/washizu/table.html.
 2.
Note that Eq. (2) is the dual cost function to the Leontief production function.
 3.
By the symmetric condition, \(\beta _{{h^{\prime}h}} = \beta _{{hh'}}\).
 4.
 5.
The same data is found also at website of Japan Center for Climate Change Actions. http://www.jccca.org/chart/chart04_03.html.
Abbreviations
 CGE:

computable general equilibrium
 KEPC:

Kyushu Electric Power Company
 CES:

constant elasticity of substitution
 SAM:

social accounting matrix
 SNA:

system of national account
 CET:

constant elasticity of transformation
 BAU:

business as usual
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Acknowledgements
The expanded input–output table used in this study is generated by Institute for Economic Analysis of Nextgeneration Science and Technology of Waseda University. The author thanks to professor Jiro Nemoto of Nagoya University for advices.
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The major contribution is to apply translog function to CGE model, and to investigate power generations sector under carbon tax assuming substitution scenario and complement scenario. Moreover, the author contributes to estimation of elasticity of substitution in Armington function of Japanese industry.
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Appendices
Appendix A: The result of sensitivity test
As mentioned in footnote 6, the sensitivity test is conducted to check the robustness of the model. The result of sensitivity test is shown in Table 8. The values shown in the table are percentage change from the results of the calculation with original parameter. The sensitivity test is conducted under the no shock (i.e., carbon tax is zero) condition. As shown in the table, the percentage changes in the production of each sector converge as the variation in the parameter becomes small. This implies that model is stable. Note that the sensitivity test shown in this paper is practiced for the substitution scenario, but there is no significant change for the complement scenario.
Appendix B: The results of additional simulation
For the additional scenario, the elasticities of substitution between renewable energy and three other power sources in scenario 2 is doubled to confirm the results of the scenario. The adjusted elasticities of substitution are shown in Table 9, and the results of the simulation of the added scenario are shown in Fig. 6. Compared to Fig. 4 in Sect. 4, the results show that the power switch from thermal power to renewable energy becomes smaller and substitution of nuclear and hydro for thermal power generation are slightly bigger than the original results. These results are attributed to the enhanced elasticity of substitution between the power sources.
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Kim, K.I. Investigation of Japanese electricity industry using a CGE model of translog function. Economic Structures 8, 20 (2019). https://doi.org/10.1186/s4000801901551
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Keywords
 Computable general equilibrium
 Translog function
 Electricity industry
 Substitution
 Complement