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Energy Efficiency

, Volume 9, Issue 3, pp 771–790 | Cite as

Beyond the end-consumer: how would improvements in residential energy efficiency affect the power sector in Saudi Arabia?

  • Walid Matar
Open Access
Original Article

Abstract

Energy efficiency in buildings has garnered significant attention in Saudi Arabia. This paper outlines the potential effects of higher residential efficiency on electricity load profiles in the Kingdom. It further presents the associated benefits that could have been realized by the local utilities in 2011. To perform the analysis, we designed an integrated methodology in which an engineering-based residential electricity demand model is used within an economic equilibrium framework. The modeling approach allows us to capture the physical interactions arising from higher efficiency and the structural changes that could occur in the economy beyond the end-consumers. Raising the average air-conditioner energy efficiency ratio (EER) to 11 British thermal unit (BTU)/(Wh) from its 2011 average would have saved 225,000 barrels/day of crude oil in electricity generation. Alternatively, increasing the share of insulated homes from 27 to 64 % would have allowed the power sector to lower its use of the fuel by 158,000 barrels/day. Combining both measures in a single simulation yields incremental yet not additive reductions. All alternative scenarios reduce costs to the utilities and improve the average thermal efficiency for the electricity generated. The studied efficiency options shift the load curve downward during the peak load segment when the least efficient turbines would be used. We additionally show how efficiency improvements in end-uses can affect the decisions of other sectors in the economy.

Keywords

Energy efficiency Saudi Arabia EER Thermal insulation Residential energy use Economic model 

Introduction

In light of rapidly increasing domestic demand for fossil fuels, Saudi Arabia has been exploring various options to lower its energy consumption. Matar et al. (2015) have previously shown potential energy savings by altering the local fuel prices offered to industrial firms and incentivizing the utilities to adopt more efficient technologies. Their study did not consider any deviations in energy use by the end-consumers. Further gains could be realized by targeting the residential sector as it is responsible for half of local electricity demand.

The government has placed emphasis on efficiency as an alternative to price reform for households, as has been shown with the efforts of the Saudi Energy Efficiency Center and the Ministry of Water and Electricity. Public awareness campaigns have complemented the recent introduction of more stringent standards for air conditioners and the requirement for new residences to have thermal insulation. This study investigates the system effects of the widespread adoption of these efficiency measures.

The Kingdom’s pursuit of higher residential efficiency is largely motivated by the rapid growth in electricity use and the associated reliance on oil for power generation. With crude oil sold to utilities at US$4.24/barrel, the substantial use of the fuel domestically generates a large opportunity cost to the government. Of course, other benefits like lower pollutant emissions could be also achieved.

The objectives of this analysis are twofold: one is to calculate the potential shifts in the hourly system-level power demand resulting from more efficient households. The other is to quantify the impact of the new load curves on the operations of the electricity sector. To accomplish this, we simulate the effects that efficiency measures have on residential electricity demand using an engineering-based approach. The simulations are then linked with the recently developed KAPSARC Energy Model (KEM) for Saudi Arabia. KEM is a partial economic equilibrium model that represents six of the country’s energy intensive sectors. Matar et al. (2014, 2015) describe KEM and its calibration to the year 2011.

Any changes the electricity sector makes to its operating decisions may have a cascading impact on other sectors in the economy. For instance, reduced use of refined oil products for power generation would cause an operational change in the refining sector, which would also have an effect on the grade and quantity of crude oil supplied to the domestic refineries. Any quantities of crude oil saved, whether in the power plants or refineries, could be exported immediately or stored for future generations.

We could not find many studies on the impact of more efficient electricity use by households on the rest of the economy. Recently, Lecca et al. (2014) investigated the greater effects of a general household efficiency improvement using a methodology based on the input-output approach. This methodology represents the flows of goods and services between production sectors using technical coefficients. We show in this paper that other sectors in an economy can also experience structural changes as a result of more efficient households. Economic models founded on the input-output technique use constant annual technical coefficients and hence may not capture these factors. Although we represent the intraday variations in electricity demand and generation, it is important to note that Lecca et al. (2014) take a general equilibrium approach whereas our work takes a partial equilibrium view.

While there have been several studies on modeling end-use energy consumption in Saudi Arabia, they have used top-down approaches and none have focused on the residential sector per se. For example, Ibrahim (2011) and Gately et al. (2012) applied econometric methods to study the relationship between energy consumption and socio-economic factors, like price and income. In this respect, we demonstrate in this paper the insights gained by simulating hourly electricity use using engineering relationships. Furthermore, this paper fills the void in the literature pertaining to Saudi Arabia.

To our knowledge, an end-use model of the type presented here has never been integrated with an economic model. Kannan and Strachan (2009) applied the UK MARKAL model to study the system-wide effects of decarbonization and the associated role of the residential sector in the UK. Their model contained a disaggregated representation of end-uses by the residential sector, but it did not capture the energy use detail of building stock simulation models. There have, however, been several household electricity demand studies conducted for other regions using the engineering approach applied in this work (e.g., MacGregor et al. 1993; Wan and Yik 2004; Shimoda et al. 2004).

The paper is structured as follows: The next two sections provide an overview of electricity demand, the make-up of residences in Saudi Arabia, and the role of local energy prices. The modeling approach and the integration with KEM are then detailed, followed by a discussion of the data used for calibrating the residential model. The paper is concluded with the presentation and discussion of the results.

A background of Saudi electricity demand and the residential sector

Electricity demand in Saudi Arabia is characterized by the average hourly loads shown in Fig. 1. The four regions correspond to the operating areas of the Saudi Electricity Company (SEC), which is the largest local electricity producer and the sole grid operator. The loads reflect the seasonal effects on electricity demand, driven by the use of air conditioning in the warmer months. The great amount of electricity flowing to residential air-conditioning units has been repeatedly brought up in the past. Faruqui et al. (2011) have stated that cooling demand is responsible for 70 % of the sector’s electricity consumption.
Fig. 1

2011 average regional load curves for weekdays (source: Electricity and Cogeneration Regulatory Authority 2011)

According to the latest figures from Enerdata (2015), the average household in Saudi Arabia consumed 23 MWh of electricity in 2013, which was the third highest globally after Kuwait and Qatar. For comparison, households in the USA and China consumed 12.2 and 1.5 MWh that year, respectively. With this in mind, the residential sector has historically represented around half of domestic electricity consumption. Figure 2 illustrates the geographical representation in our model and the regional shares of household electricity consumption for the year of our analysis. Lesser to some extent in the eastern region due to the large presence of industry, the residential sector is a key driver for national electricity demand.
Fig. 2

Shares of electricity consumption by sector and region in 2011 (source: Saudi Arabian Monetary Agency (2014))

Furthermore, the Saudi Central Department of Statistics and Information (CDSI) decomposes the regional housing stock into traditional houses, villas, apartments, floors in villas or traditional houses, and other residences. Other residences include huts and tents, which are not typically connected to the power grid. Figure 3 shows the composition of the stock in past census years. The share of traditional houses and “other” residences in the stock has gradually decreased over the 18-year period. The share of apartments has conversely experienced consistent growth, comprising more than 40 % of the housing stock in 2010.
Fig. 3

Composition of the Saudi housing stock in past census years

The role of energy prices for utilities and households in Saudi Arabia

The local power sector is dominated by SEC, owned mostly by the government and some independent power producers. Power plants face regulated prices for the fuels they purchase and their electricity output. For example, crude oil and natural gas are sold to the utilities at US$4.24/barrel and US$0.75/MMBTU, respectively. These prices have had adverse effects on the firms’ investment decisions. Lower-capital cost and inefficient plants have been favored to more expensive and efficient technologies. As described in the following section, although the power sector is part of an integrated model of the energy economy, it makes decisions based on the costs it faces, which include these administered fuel prices.

Moreover, residential customers pay 1.3 US cents/kWh for the first 2 MWh consumed/month, and the tariff progressively increases for incremental levels of consumption. The fixed tariff structure, which is applied nationally, means any changes in demand resulting from higher household efficiency may affect the average and marginal costs of delivering electricity, but that will not translate to a change in price for households.

The low electricity price does not generally encourage higher energy efficiency. Local government agencies have so far taken the route of driving efficiency through enforcement of higher standards rather than inducing adoption by increasing the electricity price. The Saudi Standards, Metrology and Quality Organization (2013) recently raised the minimum EER (rated at 35 °C) of new air conditioners to 9.5 British thermal unit (BTU)/(Wh) from 7.5 BTU/(Wh); this standard is expected to further rise to 11.5 BTU/(Wh) in the near term. The already-established Saudi Building Code also addresses standards for material properties of residential units, but due to lack of compliance, the government mandated in 2013 that all new residences must have thermally insulating materials to be connected to the grid.

Methodology and interfacing the model with KEM

An engineering-based model was adopted to capture the physical and technological factors that impact electricity use in residences. This approach is capable of addressing policy and technology issues beyond the scope of econometric and activity-based methods. The operational decisions of the power sector change throughout the day depending on the level of expected demand. The daily demand profile can be highly influenced by how much cooling and heating households require in order to maintain comfort. Furthermore, the level of electricity used to maintain comfortable indoor conditions is contingent upon structural attributes of homes, occupancy and equipment characteristics, and outdoor weather variation. These temporal interactions between physical properties, demand, and electricity generation affect the fuel use and equipment ramping decisions made by electricity producers. The model’s hourly resolution also allows the simulation of the intraday effects of any load-altering efficiency measure.

Due to the significance of heating, ventilating, and air conditioning (HVAC) on the demand for electricity in Saudi Arabia, the residential model constructs power load curves using the electricity consumption of HVAC systems as the foundation upon which other end-uses are added. The model simulates the conductive, convective, and radiative heat gains that take place in residential enclosures by taking into account outdoor conditions and residence characteristics. The required operating level of the HVAC system to achieve some desired indoor air conditions is also calculated.

An in-depth description of the modeling methodology and validation is given in Appendix 1. The simulations are performed for archetypes that represent the housing stock for three seasonal periods and all regions. The results are scaled up in accordance with the number of each residence type in the regional housing stock.

KEM is designed to handle the regulated prices that permeate the Saudi energy economy. Rather than restricting the model to a system optimization approach, to find an equilibrium, each sector in KEM optimizes its own cost or profit based on the costs and prices it sees. The power sector is represented as a cost minimizer that is now structured to use chronological load curves for each region to make equipment and fuel use decisions; the load curves are discretized into eight daily load segments. Considered power generation technologies include conventional thermal plants, nuclear, photovoltaic, concentrating solar power, and wind. The model structure uses variables for existing capacities, building additional plants, and the operation of the installed capacity in each load segment. A transmission network is also modeled to allow for inter-regional electricity flows. In addition to capacity balance, operation, and cost-accounting equations, reserve margin requirements may also be enforced.

The residential model was designed from the outset to be linked with KEM. As such, the seasonal and regional disaggregation is consistent between the two models. Almost 200 hourly load curves are generated for the combination of archetypes, types of day, seasons, and regions. Thus to reduce computation time, the model sequentially solves through all seasons and regions while running a separate yet concurrent process for each archetype; the power loads for the weekdays and weekends/holidays are computed simultaneously. The results are output to a spreadsheet, which is then read by KEM for further pre-processing to convert from hours to the discretized load segments. KEM stores the baseline residential load data, and the updated loads are picked up as alternative residential demand scenarios are run. The two data sets are needed to calculate the resulting deviation from the 2011 system load curves.

Parameterization of the residential model for Saudi Arabia

The model is calibrated such that regional electricity consumption matches the 2011 data published by the Electricity and Cogeneration Regulatory Authority (2011). The calibration relies on the data gathered through the meter reading and billing process carried out by SEC. The calibrated electricity use of consumer electronics, home appliances, lighting, and water heaters is also matched with the figures provided by Faruqui et al. (2011). Appendix 2 details the assumptions and parameters used for calibration.

Description of scenarios

The residential model is jointly run with KEM in a counterfactual framework looking back on the year 2011. While the household demand varies by scenario, the power sector is only allowed to use its existing capacity for that year to meet total demand. In addition to a baseline case replicating the consumption in 2011 called the Reference scenario, three alternative scenarios have been designed to observe the effects of more efficient residences on the system load and the operating decisions of the electricity sector. These hypothetical scenarios are inspired by the recent regulations to enforce more efficient air-conditioning performance and increase the prevalence of thermal insulation. The two measures have garnered the greatest interest domestically and target electricity demand during peak hours. The analysis considers that households maintain the same level of service from their equipment; for example, the thermostat set-point does not change across scenarios.

The scenario higher prevalence of thermal insulation explores what would have been the impact on the power system had there been more insulated residences in 2011. The scenario stipulates that 90 % of villas, apartments, and single-floor residences in villas have polystyrene insulation material; this would raise the percentage of insulated residences in the entire housing stock to nearly 64 % compared with the baseline value of 27 %. The model converts the non-insulated archetypes to adopt the material characteristics of those with polystyrene insulation as described in Table 6 in Appendix 2.

Moreover, the implementation of more stringent EER standards for new air-conditioning units could substantially reduce the electricity use in the baseline case. The scenario increased EER studies the system effects of improved air-conditioning performance in the Saudi residential sector. Inspired by the gradual implementation of higher standards, we carried out the simulation of the scenario for a range of EER values. The simulations are performed over values ranging from the 2011 local average of 7 to 11 BTU/(Wh), which according to AMAD for Technical Consultation and Laboratories (2011) would bring it closer to the market averages in the USA, China, and South Korea.

The third alternative scenario investigates the effects of combining the features of the first two cases by increasing the national EER to 11 BTU/(Wh) and imposing the 64 % share for insulated residences. This scenario is called combined EER and insulation.

Results and discussion

Table 1 compares the regional model results in the reference scenario to the actual residential electricity consumption in 2011. Current grid infrastructure does not track power flows to their end-use destination for determining sectoral load curves. It is still useful, however, to compare the simulated residential curves with the measured loads in the whole system. Figures 4, 5, and 6 show the residential profiles in the reference case and the measured system-level loads for each seasonal period. The system loads include the consumption by the industrial, commercial, and government sectors. The measured loads on weekends/holidays exhibit a similar profile to those on weekdays, although they are slightly lower. The similarity of the profiles’ shapes is a feature of cooling demand that may not highly depend on type of day. The curves for residences are constructed using the sum of the model’s regional outputs. The slight differences in the residential loads between weekdays and weekends/holidays are due to differing occupancy patterns.
Table 1

Regional electricity consumption in the reference scenario versus actual data

Region

Residential electricity consumption (TWh)

Model result

Actual data

West

41.65

38.74

South

10.98

12.17

East

21.87

21.31

Central

36.93

37.04

National

111.44

109.26

Fig. 4

National system load and the residential model output (reference, summer)

Fig. 5

National system load and the residential model output (reference, spring/fall)

Fig. 6

National system load and the residential model output (reference, winter)

The simulated and measured load profiles exhibit visible correlation during the early evening period when lights would typically be turned on and throughout the day as cooling demand gradually increases before declining in the evening. While there is overall correlation, slight deviations in some seasons in the morning period may result from the approximated solar relationships for Saudi Arabia and the relatively coarse hourly discretization.

The load-shifting potential of the efficiency measures

Figures 7, 8, and 9 illustrate how the seasonal load curves for the entire power system would change in the alternative scenarios. As to be expected, the least impact on load is observed in the winter, and the greatest reductions take place in the warmer months. There is a time lag when heat conducts through the walls and roof of residential enclosures. The reduction of heat gain, and ultimately the cooling load, does not happen instantaneously, as shown by the load curves for higher prevalence of thermal insulation. The load reductions for the increased EER scenario can be realized immediately as this case involves a direct use of electricity as opposed to an indirect effect. Some regions may not require air conditioning depending on time of day or seasonal period. The regional components of these load demands are what KEM reads for finding the equilibrium.
Fig. 7

The system-level load curves for each scenario in the summer

Fig. 8

The system-level load curves for each scenario in the spring and fall

Fig. 9

The system-level load curves for each scenario in the winter

The implications of more efficient households on the power system

For each scenario, Table 2 shows the electricity consumption by residences, the average thermal efficiency for total electricity generated, and the reductions in total cost and crude oil consumption for the power sector.
Table 2

Comparison of the results for each scenario in a simulation for the year 2011

 

Reference

Higher prevalence of thermal insulation

Increased EER to 11 BTU/(Wh)

Combined EER and Insulation

National residential electricity use (TWh)

111.44

93.55

86.03

74.05

Reduction in total cost to power sector (million USD)

428.50

607.62

880.46

Reduction in oil consumption by power sector (thousand barrels/day)

Summer

233.5

339.2

376.0

Spring and fall

169.3

228.9

271.6

Winter

58.4

97.6

147.4

Yearly average

158.3

224.6

267.6

Average cost of generation (US cents/kWh)

1.701

1.682

1.680

1.674

Average thermal efficiency of electricity generation in the power sectora

34.0 %

35.0 %

35.5 %

36.3 %

aThe average plant heat rates are calibrated to the actual operation of SEC power plants in 2011. Open-cycle gas turbines used 12,820 BTU/kWh, steam plants used 8950 BTU/kWh, and combined-cycle plants used 8870 BTU/kWh. These values slightly differ by the type of fuel used

An increase of the average EER to 11 BTU/(Wh) and the higher prevalence of thermal insulation scenario would have resulted in a 22.8 and 16.1 % decrease in residential electricity consumption, respectively. Combining both efficiency options in a single simulation would have resulted in incremental yet not additive reductions in electricity use. The two measures have interacting features. Reducing the heat gain would lower the extent to which air conditioning is utilized, thus lessening the impact of a higher EER. The non-additive property of combining efficiency measures is less obvious for the seasonal reduction in oil use. This is because the power sector can substitute the use of some fuels between seasons as a result of altered regional load curves.

The reductions in cost take into account fuels purchased at the locally administered prices, non-fuel variable operations and maintenance (O&M) costs, and fixed O&M costs. Total and average cost reductions in the alternative scenarios arise from the lowered operation level to meet demand and the more efficient utilization of the installed power capacity.

The average thermal efficiency for the total electricity generated increases from 34 % in the reference scenario to 35 and 35.5 % in the higher prevalence of thermal insulation and increased EER scenarios, respectively. Combining the features of those two scenarios yields an average thermal efficiency of 36.3 %. The residential measures analyzed target the peak load hours, when the least-efficient and highest-marginal-cost equipment would be operated. While this equipment is not retired in the model, the utility does not operate them. Figure 10 illustrates this behavior, showing the model results for national dispatch by technology during a summer weekday; there are very small photovoltaic capacities that always produce power during the day. Combined-cycle and steam turbine plants are used to satisfy the base load.
Fig. 10

Electricity dispatch by power plant technology on a summer weekday

Figure 11 shows the corresponding fuel consumption in the model’s load segments on a summer weekday. Any reduction in local electricity demand causes a decline in the amount of crude oil used by the power sector. Natural gas is highly demanded domestically because of its administered fuel price relative to the price of crude oil and the thermal efficiencies of existing plants that use gas. Gas supply, however, is constrained below the level of fuel demand and crude oil is hence used as the marginal fuel for generation. The use of oil in power plants rises sharply in the summer months and exhibits a periodic consumption pattern throughout the year. Since the greatest reductions in electricity demand and associated oil consumption are observed in the summer months, these measures help the power sector mitigate the annual peaks in consumption that cut into Saudi Arabia’s ability to export oil.
Fig. 11

Fuel use by the power sector on a summer weekday (note: HFO stands for heavy fuel oil)

Furthermore, Fig. 12 presents the residential electricity use and the change in oil consumption by the power sector as the EER is gradually raised to 11 BTU/(Wh).
Fig. 12

2011 residential electricity consumption and reduction in crude oil consumption for power generation as air-conditioner performance is improved

Primary and secondary effects contributing to lower fuel use for power generation

The results highlight the presence of two effects that influence the amount of fuels burned by the power sector. Firstly, there is a direct reduction in fuel use caused by lower electricity production. Secondly, the more efficient utilization of the generation capacity leads to less fuel consumed per unit of electricity produced. Table 3 shows the national reductions of oil use in power plants attributed to both of these effects.
Table 3

Decomposition of the factors contributing to lower oil use by power sector

Factor

Season

Higher prevalence of thermal insulation

Increased EER to 11 BTU/(Wh)

Combined EER and insulation

Lower electricity production

Summer

199.4

291.3

334.1

Spring and fall

143.5

201.0

248.7

Winter

57.8

96.5

146.6

Higher efficiency

Summer

34.1

47.9

41.9

Spring and fall

25.7

27.9

22.9

Winter

0.6

1.1

0.9

Units in thousand barrels per day

The fuel savings due to lower production are calculated as the change in electricity output using oil multiplied by the average heat rate of oil-generated electricity in the reference scenario. Similarly, the savings due to higher efficiency are computed as the change in the average heat rate of oil-generated electricity multiplied by the quantity of electricity produced using oil in the alternative scenarios. In the combined EER and insulation scenario, for example, the average fuel use rate of oil-burning plants decreases from about 1900 to 1723 barrels/GWh. This is directly due to lower dispatch using open-cycle gas turbines.

It can be seen that neglecting the secondary factor may result in underestimating the magnitude of the economic domino effect caused by more efficient households. In the context of this analysis, higher energy efficiency for end-uses can cause other sectors in the economy to also become more efficient. For instance, the shift in electricity demand during the peak load segments as a result of combining higher EER and insulation would yield a lower and flatter load profile. This means the power sector would not have to operate low-capital-cost yet high-operation-cost turbines typically reserved for only a small number of hours in the year. Models using the input-output approach would not be able to capture these secondary sectoral interactions. In those models, the coefficients relating the fuel-supplying sectors and the power sector remain constant.

Conclusion

This analysis demonstrated the potential domino effect of improving energy efficiency in the Saudi residential sector. It particularly highlighted the benefits that could have been realized by the local power sector in 2011 as it reacts to changes in the hourly electricity demand. An engineering-based residential electricity model was used to assess the load-shifting potential of increased thermal insulation adoption and higher air-conditioning efficiency. The load curves are linked to a bottom-up economic equilibrium model to simulate the interactions with the utilities. Our approach captures the physical relationships that dictate the magnitude and time of load-shifting as a result of higher efficiency.

All alternative scenarios resulted in significant reductions in oil consumption for power generation and lower costs to the power sector. While two cases tested the individual effects of higher EER and increased levels of insulation on electricity use, a third showed there would be additional yet not necessarily additive benefits of applying them together. The reason for this is that both measures have interacting physical features. The model could also be used to test other measures or vary the parameters of the presented scenarios. For example, the use of different materials for thermal insulation or the application of low-solar-absorptivity paints for external walls may be investigated.

Furthermore, the results show more efficient use of the existing power generation capacity due to the widespread adoption of the two efficiency measures. The least efficient gas turbines, which are put off to only be used during the highest load periods, are forgone as the measures lower power demand during peak hours. The fuel-saving benefits for the power sector when peaking equipment would be ramped up are greater than those realized if the electricity reduction takes place in the base load segment. Also, consumption of crude oil for power generation exhibits large swings throughout the year. The efficiency options analyzed lower the electricity use for space cooling, and would therefore mitigate the large seasonal swings in demand.

We also demonstrate the capabilities of applying engineering end-use models within a bottom-up economic framework. Such linkage could allow the study of policy issues not achievable through other methods. The approach we take captures the physical factors that govern hourly demand for electricity, which influences the decisions made by the utilities. Applications of our model cover efficiency and also extend to other topics like the deployment of distributed generation in homes, the associated impact on simulated loads, and the greater system effects. We are also working on price response features to study how households may change equipment settings or shift appliance use under various electricity pricing schemes. Such issues require factoring in physical effects shaping the load profile. Data development will also be a focus of research, as more up-to-date data is required for future work.

Footnotes

  1. 1.

    This is the value used by commercial software package DesignBuilder.

  2. 2.

    For most appliances, typical power ratings are taken from Gottwalt et al. (2011).

Notes

Acknowledgments

The author thanks Anwar Gasim for the estimation of lighting technology breakdown in residences. Helpful comments were provided on previous versions of the paper by Carlos A. Bollino, Frederic Murphy, Patrick Bean, David Hobbs, and four anonymous referees.

Conflict of interest

The author declares that he has no conflict of interest.

Supplementary material

12053_2015_9392_MOESM1_ESM.pdf (81 kb)
ESM 1 (PDF 80.7 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.King Abdullah Petroleum Studies and Research Center (KAPSARC)RiyadhSaudi Arabia

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