Solar energy implementation at the household level: Gaza Strip case study

Background: The Gaza Strip in Palestine is currently facing a serious electrical power deficit due to the local political situation. In addition, the main source of energy in Gaza Strip is traditional fossil fuel which is environmentally harm‑ ful. To ensure that electrical power in the Gaza Strip can be maintained continuously without any day‑long power failures is a challenging task for decision‑makers. The lack of reliable electrical power has motivated the inhabitants of the Gaza Strip to adopt an alternative source of energy which is reliable, sustainable, environmentally friendly and abundantly exists. Therefore, they decided to implement solar energy systems to power their houses in order to replace or to complement the traditional sources of energy. This has motivated the current study which aims to find out whether solar energy can be an alternative source of energy to the conventional energy for domestic use in the Gaza Strip to sustain inhabitants’ daily life. This has been tested by studying the readiness and attitudes of household people in the Gaza Strip to adopt solar energy in their homes. This work is a novel study in its contents. According to the authors’ knowledge, this is one of few studies considering this topic. Methods: To understand the reasons for successful solar energy system adoption by individual households in Gaza, the authors have created an electronic questionnaire. The dependent variable is chosen to be the adoption of energy, and independent variables are the environmental benefit, the cost of adoption of solar energy, and the economic sav‑ ings of solar energy measured. The electronic questionnaire consists of two parts: part one consists of personal ques‑ tions; the second part consists of 22 items on a five‑point Likert scale and the studied sample population consists of the 10% of the Al‑Shifa Medical Complex employees (1819 employees). The electronic questionnaires were electroni‑ cally circulated to the study sample. The data were then collected and analyzed using an SPSS program. Results: The authors found that only 19.5% of the studied sample population have installed to the political situation in the Gaza Strip. Additionally, the electrical demand depends on the season, e.g., in the summer and winter seasons, the energy consumption reaches 440 and decreases to 380 MW for the rest of the year By sim-ple math, it is easy to see that most of the year the electrical power deficit varies between 220 to 280 MW Conclusion: The adoption of solar energy in Gaza is limited. The kind of the house and the knowledge of renewable energy are imperative to increase utilization of solar energy by households in Gaza. Therefore, it is important to start a public information campaign on the advantages of solar energy through the universities by giving classes to all university students and/or by giving general talks for the public. To conquer the limiting factors, the public authority ought to consider the framework and support the neighborhood occupants.


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El-Khozondar and El-batta Energy, Sustainability and Society (2022) 12:17 Background Renewable energies are a clean and sustainable source of energy. One of the most common sources of renewable energy is solar energy, capable of meeting most of the challenges that confront the world. It provides people with a safe and environmentally friendly energy source. Photovoltaics, PV, are the basic element of a solar power system. Photovoltaics harvest solar irradiance to produce clean electrical energy, decreasing the green house emission and the reliance on customary nonrenewable energy sources. Solar energy systems capture the light, converting it to electrical energy, and distributing it to the user. The systems consist of solar panels (PV connected in parallel and series), an inverter, a battery pack, and a charge controller [4]. Other secondary equipment consists of solar array mounting racks, a DC disconnect array, a power meter, a utility meter, a kilowatt meter and a backup generator. Various types of solar systems for residential use exist on the market. Those commercial solar systems offer various features, including grid connections, type of materials and type of battery. The solar system might be connected to the grid, stand alone or exist as a hybrid system [5].
The energy sector plays a vital role in development of the economy in many societies [6], especially in the Gaza Strip where about 75% of its energy needs are imported, i.e., 66.6% from Israel and 8.5% from Egypt, while the remaining 25% of energy is generated locally by the sole Palestinian power plant [7]. Table 1 summarizes the quantity of imported energy and its average consumer prices in The Gaza Strip according to the type of energy [7]. The Gaza Strip receives 120 MW from Israel, 37 MW in case all the lines from Egypt are operating, and approximately 80 MW (which is usually less than its full capacity of 120 MW) from the local power plant [8]. However, currently the local power plant and the Israeli line only provide Gaza with 54 MW and 70 MW, respectively, instead of their full capacity due to the political situation in the Gaza Strip. Additionally, the electrical demand depends on the season, e.g., in the summer and winter seasons, the energy consumption reaches 440 MW and decreases to 380 MW for the rest of the year [9]. By simple math, it is easy to see that most of the year the electrical power deficit varies between 220 to 280 MW [8,9].
In a recent report by the Palestinian investment promotion agency (https:// bit. ly/ 3u0zn xO), the cost of electricity for different customers in the Gaza Strip is given in Table 2. Table 2 shows that the price of energy is a burden for any investment.
Palestine is in a strategic location at the crossroads of three continents, Africa, Asia and Europe. The Gaza Strip is situated in the southeast of Palestine and has a 41-km coastline on Mediterranean Sea (Fig. 1). Its width varies from 6 to ~ 12 km and its total area is 365 km 2 . It lies on Longitude 34°26′ east and Latitude 31° 10′ north of the equator. The Gaza Strip is a highly populated area. By the end of 2020, 2.1 million persons were living in Gaza according to the Palestinian Central Bureau of Statistics (https:// rb. gy/ nsmlfk) with an annual growth rate of 2.7% making it one of the highest populated densities in the world. The Gaza Strip has a Mediterranean climate of hot summers with 300 sunshine days, and cool, rainy, short winters. It has annual global horizontal irradiance (GHI) above 2000 kWh/ m 2 , as presented in Fig. 1. The rapid population growth Conclusion: The adoption of solar energy in Gaza is limited. The kind of the house and the knowledge of renewable energy are imperative to increase utilization of solar energy by households in Gaza. Therefore, it is important to start a public information campaign on the advantages of solar energy through the universities by giving classes to all university students and/or by giving general talks for the public. To conquer the limiting factors, the public authority ought to consider the framework and support the neighborhood occupants.
Keywords: Solar energy, Fostering solar system, Energy cost, Energy marketing, Environmental effect  forcing locals to search for alternatives including electric generators and solar energy in particular to power homes, hospitals and schools [8,9]. The problem is made worse due to the tension between local political parties in Palestine over custom tax revenues. Accordingly, the electricity deficit in the Gaza Strip is considered a major problem that severely limits the local economy, the social welfare and consequently the living standards of Gazans. Gazans are desperate to adopt different energy sources because of the situation in which they live. Thus, it is important to make a thorough study of the benefits of using of any alternative energy systems and their applicability in peoples' lives.
The main sources of renewable energy are solar energy, wind, biomass and geothermal energy. Solar energy is considered the most important of all these systems and highly applicable in the Gaza Strip. In 2019, Nassara and Alsadib presented a study on implementation of solar energy in the Gaza Strip as replacement for fossil fuels [7]. They studied the possibility of using photovoltaic (PV) and concentrating (CS) solar systems in the Gaza Strip. They analyzed solar radiation data for five major cities in Gaza that had been collected for 15 years from 2000 to 2015 using a System Advisor Model. They concluded with a strong recommendation for the use solar energy to power the Gaza Strip [7].
Wind energy is considered the second source of renewable energy that has high potential in the Gaza Strip. Nassara and Alsadib in 2018 [10] assessed using wind energy in three different places in the Gaza Strip (Rafah, Deir-albalah and Jabalia). They analyzed data which were collected for wind speed and its direction in 16 years (2000-2015). According to their study, the monthly mean velocity in Rafa is 6.34 m/s, in Deir-albalah is 4.41 m/s and in Jabalia is 3.98 m/s [10]. The result of their analysis unveiled that the best place for a wind farm in Palestine is Rafah city in the southern part of Palestine on the border with Egypt. They explained that Rafah city has the highest wind energy capacity and being on the border with Egypt simplifies the process of getting the needed equipment and experts due to the low cost of transportation and communications. Moreover, the low population density of Rafah City makes the economic viability of exploiting wind energy a possibility. It has been estimated that each wind turbine will produce 15,952 MWh; therefore, it requires 110 wind turbines to cover the shortage of 200 MW [10].
A specific demonstration project was done by installing a 5-kW wind turbine on the top of a residential building. At a height of 10 m, the wind turbine produced 2695 kWh annually. A wind turbine mounted at 70 m will increase the annual electricity produced by 120%. The electric energy obtained via wind systems could provide up to 84% of the annual output of a photovoltaic energy system [11].
In addition to solar energy and wind energy, biomass plays an important role as a source of energy as it is abundant by nature. Biomass is significantly more environmentally friendly than the hazardous exhaust gases from petrochemical fueled vehicles and power sources. Biomass energy could be used for cooking, heating, electricity production, steam and liquifying biofuels. Biomass energy provides about 9-13% of the global energy source and around 8% of Palestinian energy [12].
Geothermal energy is the least explored energy in Palestine. In a study by Beithou and Al-Ganam [13], the accessibility of geothermal energy as a source of energy and electricity in Palestine was discussed. Their results indicated that the Gaza Strip and north Palestine south of Tabariya Lake are good sources for geothermal energy. Moreover, the produced geothermal energy can be independently used to produce electrical power.
Implementation of renewable energy, and in particular solar energy, in the Gaza Strip started in 2012 when the Ministry of Health used solar energy to power several clinics and hospitals, e.g., department of care cardiac surgery in Al-Shifa medical complex [14]. The Ministry of Education and Higher Education followed the same strategy and used solar energy to power schools and some administrative offices. The Ministry of equipment and Higher Education and the Palestine Investment Fund (PIF) in Palestine have an agreement to equip 500 public schools with solar energy systems [15]. The Ministry of Agriculture and the Ministry of the Interior also started to adopt solar energy systems for their departments. Other local institutes, municipalities, universities, and homes are also starting to use solar energy systems. Gaza Electricity Distribution Corporation (GEDCO) is encouraging people to use solar systems to power their houses by selling their customers installation systems [16].
In recent years, several researchers conducted studies on handling the issue of applying solar energy systems in Palestine and in the Gaza Strip in particular. Nassar and Alsadi studied and assessed the energy situation in the Gaza Strip and accordingly they suggested four solutions for the electricity crisis in Gaza [7]. In their study, they performed an economical and environmental assessment of the four solutions to identify the one which is the best solution. Later the same authors gave an assessment of the potential of solar energy in the Gaza Strip in order to eliminate the suffering of Gazans due to lack of electricity [17]. They proposed solving the Gaza Strip energy needs by building PV systems on the roofs of local houses that would then produce 555 MW. Although the solution will cost more than the existing utility company feed line, this solar energy solution will The authors studied the viability of these systems and their potential for providing stable energy for Palestine [18]. In a study performed in 2011, Aydi used the data from a solar radiation survey for years (1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002) to investigate the possibility of adopting solar energy in the Gaza Strip. His result shows that it is possible to locate places for solar power plants. However, in order to determine the economic benefits, more data were needed for the simulation [19]. Hamed et al. (2013) listed the types of renewable energy that could be implemented in Palestine: solar, wind, biogas and geothermal energy. The study estimated that 36% of energy demand can be generated from wind and solar energy [20]. A study of renewable energy in the Gaza Strip by Juaidi [21] gave a review of potential renewable energy sources and also concludes that main sources are wind and solar energy. That combination of wind and solar energy will help Gazans to get stable delivery of energy and decrease its dependence on fossil fuels [11].
Researchers [11,19,[21][22][23][24][25][26] have previously studied issues related to renewable energy in Palestine in general and more specifically in the Gaza Strip. They studied the electrical energy needs of the Gaza Strip, and they recommend the use of new sources of energy, i.e., solar, wind and wave energy. Other researchers (e.g., [9]) present new plans to construct solar power plants in the Gaza Strip. In 2014, PalThink for Strategic Studies published a case study report titled "Renewable Energy in the Gaza Strip: Short-, Mid-, and Long-Term concepts". This report presented the obstacles, challenges and recommendations provided by key participants of six workshops and round table discussions organized by PalThink and Friedrich-Ebert-Stiftung for the project titled "Renewable Energy as a Sustainable Solution to the Electricity Crisis in the Gaza Strip" [8]. Recommendations and approaches have been divided into short-, medium-and long-term concepts for appropriate adoption by individuals at different levels of the decision-making process [8]. In 2016, researchers examined the energy sector in Palestine and emphasized the use of renewable energy as a promising replacement for fossil fuel energy. The possible RE technologies are solar energy, wind energy, geothermal energy and/or biomass. Solar energy is already extensively utilized inside the Gaza Strip for domestic water heating; however, it is not as widely used for electricity production [21].
The environmental impact of energy production is an important factor in deciding to switch to renewable energy. The financial cost of traditional distillated oil fuel to produce 110 MW power/year is 735,475,000 [ILS/year] in the Gaza Strip and the environmental damage cost is 445,069,320 [ILs/year]. However, using renewable energy will increase the quality of the environment, reducing the amount of CO 2 emitted to the atmosphere by 484,250 kg/ day [17]. Thus, when environmental damage costs are taken into account in the economic cost calculations, the energy market clearly favors solar energy production in the Gaza Strip [17].
An important factor to implement renewable energy is public awareness. Therefore, researchers considered studying public awareness. In a study performed in Malaysia, researchers explored public awareness based on respondents' educational level and area of residence. In the study, random population samples from urban and rural areas are contacted to fill in a questionnaire. The main results indicated that most Malaysians have already learned about renewable energy and sustainability awareness (90.3% of the sample). However, 98.8% of respondents agreed that renewable energy technologies were not optimized due to the expensive costs [1].
In a different study that has been conducted in Hungary, researchers performed their study on a sample consisting of 1002 people in 2019. In their study, they analyzed awareness of renewable energy sources. In particular, their work examined the correlation between typical attitudes of different social groups to energy, comparing them with international experience. Their results show that people with better education, a higher income, and a health-and environment-conscious approach to life definitely possess a higher level of knowledge of renewable energy sources. Age, on the other hand, did not play a significant role [2].
In Palestine, in particular at the West Bank, a survey study was performed to measure the level of university students' knowledge regarding renewable energy including technical, economical and policy aspects. The sample consists of all students affiliated to AN-Najah University. The results show that gender, educational level, and parental education level have no significance on the awareness level. However, the university degree subject and high school specialization have a strong impact on the awareness level. As a general conclusion, authors found that the students' awareness and knowledge about renewable energy are limited [3].
In a recent study, the motivations for the local institutions to install solar energy were studied [9]. The authors considered three reasons for adopting a solar energy system, which are the environmental savings, market value and solar system cost. The institutions in the sample do not use solar energy as a full replacement for conventional power sources. The main results of their study show that the local institutions used the solar energy system to complement the current power system mostly for its environmental value despite its cost. In addition, the types of institutions have not affected their decisions on adopting solar systems. Thus, authors recommend solar energy systems be used as a source of energy [9]. However, authors in their study did not consider other sectors in the local society, e.g., household, small shops, and hotels. Table 3 presents the current types of solar energy systems used in different sectors. It can be seen that most domestic users use an off-grid system, while industry users apply a solar system to lower the cost of fuel.
A further study [27] analyzed solar usage by households. The population sample consisted of employees from a local hospital in Gaza. This is due to the fact that authors could not find a good source of people who installed solar systems on their houses, or they would have directly contacted those house owners who installed solar systems. They included the responders' gender, job title and income to determine the most important attributes that affected the decision to adopt a solar energy system among household owners. The results show that gender and job titles have no effect on the decision to adopt a solar energy system. However, income has a direct effect on the decision to adopt solar energy systems. The authors extended their research work to include additional attributes; i.e., geographic region, type of house, and house ownership, which are very important for understanding the reasons why local Gazans decided to install a solar system for their houses. The results will help decision-makers determine the degree of acceptance among Gazans for installing solar systems at their houses. Moreover, the results will help policy-makers to take major steps in the energy market and to create new power stations to power the Gaza Strip using solar energy.

Research's methodology
The authors chose the analytical descriptive approach in the study. They used an electronic questionnaire that had been distributed to the study sample. In choosing the study population, authors tried to get detailed information about local people who adopted a solar system at their houses, but there was no available documentation on this. Thus, the authors identified a sufficiently large community that could be surveyed, which in this case was the employees of Al-Shifa Medical Complex (1819 employees). The study sample amounted to around 10% of the total community (200 employees).
The statistical analyses used in the study have been performed using an SPSS program. The analysis included descriptive statistics, Pearson correlation coefficient, Cronbach's Alpha coefficient, Spearman Brown split half, and one-sample t test.

Research's questions and hypothesis
This work tries to answer the following main question: "Can solar energy be an alternative to conventional energy for domestic use in the Gaza Strip?" The significance level is measured at α ≤ 0.05. In the work, researchers chose "the usefulness of the implementation of solar energy in the Gaza Strip private houses" as the dependent variable and "environmental value of the system, initial installation cost of solar energy systems, and solar energy economic values" as the independent variables.
Thus, there is the following hypothesis that has been assumed in this research and derived from the main question.
There exist statistically significant differences in the employees' attitudes regarding successfully implementing solar energy technology (environmental benefit, initial installation cost of solar energy systems, and solar energy economic values) due to the following attributes: 1. The governorate, which they are living in. 2. Home ownership. 3. The types of houses, which they are living in. 4. The knowledge of renewable energy types. 5. The knowledge of the use of solar energy or solar panels. 6. Energy cost per month. 7. Availability of space for solar panels. 8. Willingness to share solar systems with neighbors. 9. Possibility of sharing the cost of the solar systems with neighbors. 10. Presence of a preexisting solar system in his/her house. 11. The year that the worker insulated the solar systems in his/her house. 12. Percentage of dependency on using solar systems in his/her house.

Results and discussions
Description of the study sample The sample (200 employees) are randomly chosen to answer the questionnaire. The geographical distribution of the sample is 63.5% of the sample live in the Gaza governorate, 20% live in the Middle governorate, 11.5% live in the north governorate, 2.5% live in the Khan Younis governorate and 2.5% live in the Rafah governorate. 66.5% of the sample live in houses that they own, 20% of the sample live in their parents' house, and 13.5% of the sample live in rented houses. 67.5% of the sample live in an apartment building, 29% of the sample live in an independent house, and 3.5% of the sample live in a farmhouse.
In terms of knowledge about the important types of renewable energy, 86% of the sample knew about the most important types of renewable energy, and 14% were not familiar with the most important types of renewable energy. 77% of the sample had some background on solar energy or used solar panels, and 23% of the sample had no background on solar energy or had not used solar panels. 49.5% of the sample has an average monthly energy bill between 150 and 300 NIS, 41.5% of the sample has an average monthly energy bill less than 150 NIS and 9% of the sample has an average monthly energy bill more than 300 NIS. 62.5% of the study sample had enough space to install solar cells, 29% of the sample did not have enough space to install solar cells, and 8.5% of the sample are not sure that they have sufficient space to install solar cells. 50.5% of the sample would not share a solar system with their neighbors, and 49.5% of the sample would share a solar system with their neighbors. 79% of the sample can only afford to invest less than 5000 NIS in constructing a solar system, 20.5% of the sample can invest between 5000 NIS and 10,000 NIS in building a solar system, and 0.5% of the sample can invest more than 10,000 NIS in building a solar system. 80.5% of the sample do not use solar energy in their house, and 19.5% of the sample uses solar energy in their house. Among the ones who have solar systems in their houses, 46.2% installed the system before 2010, 33.3% installed the system after 2014, and 20.5% installed the systems in years between 2010 and 2014. 64.1% of the sample who use solar energy in their houses are employing a solar system to supply between 20 to 50% of the total use of energy, and 30.8% use solar energy to supply less than 20% of their energy needs, and 5.1% use solar energy to supply more than 50% of their energy demands.

Statistical analysis results
In this section, the sample members are categorized according to their likelihood to support the adoption of a solar energy system to replace fossil fuel energy for domestic use in the Gaza Strip for the environmental benefit, the initial cost of a solar energy system and the economic savings. To answer this question, arithmetic mean (A.M) and relative weight (R.W.) are calculated for each item of the questionnaire. The results are exhibited in Tables 4, 5 and 6. Table 4 shows the opinion of study sample members on adopting a solar system for its environmental benefit. The highest score goes to item 8, "the sample opinion goes to adopt solar energy system in the case when the cost is equal to conventional energy system cost", which is ranked first with a R. W. of 73.10%. Item 4 "The environmental cost of energy in your opinion is more important than the material cost" is ranked the last with a R. W. of 63.90%. This shows there is a lack of awareness about the necessity to protect the environment. The total R.W. of the respondent's awareness of the environmental benefits of adopting solar technology of 69.43% is relatively low, pointing at a need to increase environmental awareness among the population of the Gaza Strip. Table 5 shows that item 11 "The government subsidy, if any, for the prices of solar energy that drives you to adopt it" is ranked the first with a R. W. of 74.20%. While item 14 "Dwelling in a remote place drives you to adopt solar energy" is ranked the last with a R. W. of 59.30%.
The total relative weight of the respondent's awareness about the initial solar system cost on the adoption of solar energy technology amounted to 67.93%. This value is relatively low, indicating that the cost does not have high impact on the respondent's decision to adopt solar system. Table 6 displays that item 20: "You see the need for specialized governmental centers to research renewable green energy" is ranked the first with an R.W. of 77% and item 21 " You desire using various green renewable energy sources" is ranked the last with a R. W. of 64.40%.
The total R.W. of the respondent's awareness of the economic savings on adoption of solar energy technology amounted to 72.04%. This relatively high value shows that the economic savings has an important effect on the decision to adopt solar systems by the respondents.
First hypothesis results: To authenticate the first hypothesis "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the advantages of adopting solar energy technology (due to the environmental benefit, the initial installation cost of solar energy systems, the economic savings) who live in different governorates. " The one-way ANOVA test "F test" was used to find the differences between the two variables as shown in Table 7.  As displayed in Table 7, the results of the one-way ANOVA test "F test" show that there are no statistically significance differences in the success of the adoption of solar energy technology due to the environmental benefit, with respect to the governorate of residence. Contrastingly, there are significantly statistical differences in the success of the adoption of solar technology (due to the initial installation cost of a solar system, the economic savings, the total) by the sample members with respect to the governorate of residence. To illustrate these differences, Scheffe tests were used and results are given accordingly.
Comparison of the sample members responses from different governates with respect to how much the decision to adopt a solar system depends upon the initial installation cost of a solar system, the economic savings and the total are given in Tables 8, 9 and 10, respectively. Table 8 shows that there are no statistically significant differences in the success of the adoption of solar energy technology with respect to the initial installation cost of solar systems, by the sample members due to the governorate in which they live. Furthermore, Table 9 exhibits that there are no statistically significant differences in the success of the adoption of solar energy technology, economic savings, which depend upon the governorate where the sample members live. Table 10 shows that there are no statistically significant differences in the success of the adoption of solar energy technology, due to the total, which depend upon the governorate where the sample members live.

The second hypothesis results
To check the second hypothesis, "There are statistically significant differences in the attitudes of the employees  of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (environmental benefit, initial solar system cost, economic savings) due to the house ownership. " The one-way ANOVA test "F test" was used to find the differences between the two variables, as shown in Table 11.
The results of the one-way ANOVA test "F test" shows that there is no statistically significant difference in the degree of success of adopting solar energy technology Table 9 The differences between the categories of the governorate in which employee lives with respect to the economic savings   (due to the environmental benefits, the solar energy, the economic savings and the total) by the sample with respect to house ownership as presented in Table 11.

The third hypothesis results
To check the third hypothesis "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to the environmental benefits, the initial solar system cost, or the economic savings) due to the type of house, in which they live". One-way ANOVA test "F test" was used to find the differences between the two variables. Table 12 demonstrates that there are statistically significant differences in the degree of success of adopting solar energy technology (due to the environmental benefits, the initial solar system cost, the economic savings and the total) by the respondents with respect to the type of house. To illustrate the differences between the categories of the type of houses in which the employees live with respect to the environmental benefit, the initial solar system cost, the economic savings, and the total, Scheffe tests are used and the results are given in Tables 13, 14, 15, and 16, respectively.
As shown in Table 13, there are statistically significant differences in the attitudes of the respondents in the degree of success of adopting solar energy technology, due to the environmental benefits, which depend upon the type of houses, those who live in an apartment building are the most in favor of solar energy systems while those who live in an independent house are second, those who live on a farm are last. However, the residents of all three categories are in favor of solar energy. Table 14 indicates that there are no statistically significant differences in the attitudes of the respondents regarding the success of adopting solar energy technology, with respect to the economic savings, which depend upon the categories of housing type (an apartment in a building, an independent house, a house on a farm). And there are statistically significant differences in the attitudes of the sample members regarding the degree of success of adopting solar energy technology, with respect to economic savings, which depend upon the categories of housing types (an apartment building, and a house on a farm) with an apartment building house most in favor of a solar energy system, as shown in Table 15.
Likewise, Table 16 indicates that there are statistically significant differences in the attitudes of the sample members regarding the success of adopting solar energy technology, and the total, with respect to the categories of housing type (apartment in a building, an independent house, a house on a farm).

The fourth hypothesis results
To check the fourth hypothesis, "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to the environmental benefit, the initial solar system cost, the economic savings) with respect to the knowledge of renewable energy types. " the independent sample "T" test was used to determine the differences between the two variables (Yes and No). "Yes" indicates that they know renewable energy. "No" indicates that they do not know renewable about energy. Table 17 displays the statistically significant differences in the success of adopting solar energy technology (due to the environmental benefit, the initial solar system cost, the economic savings and the total) by respondents depending upon their answer to the question "Do you know about the most important types of renewable energy" the majority answered "Yes" they did know about the most important types of renewable energy.

The fifth hypothesis results
To verify the fifth hypothesis, "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the degree of success of adopting solar energy technology (due to the environmental benefit, the initial solar system costs and the economic savings) depending upon the degree of knowledge about the use of solar energy or solar panels. " The independent sample "T" test was used to find Table 14 The differences between the categories of the types of houses in which the employee lives with respect to the initial solar system cost  Table 15 The differences between the categories of the type of house in which the employee lives with respect to economic savings the differences between the two variables. "Yes" indicates that they have knowledge of the use of solar energy and solar panels. "No" indicates that they do not have knowledge of the use of solar energy and solar panels. Table 18 shows that there are no statistically significant differences with respect to the success of adopting solar energy technology (due to the initial solar system cost) by respondents depending upon their answer to the question "Do you have a background on solar energy or the use of solar panels". But there are statistical differences in the success of adoption of solar energy technology (due to the environmental benefit, the economic savings and the total) by the respondents depending upon their answer to the question "Do you have a background on solar energy or the use of solar panels" for the benefit of their background on solar energy or solar panel.

Results related to the sixth hypothesis
"There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (environmental benefit, initial solar system cost and economic savings) due to the energy cost per month. " To validate the hypothesis, the one-way ANOVA "F" test was used to determine the differences between the two variables. Table 19 indicates that there are no statistically significant differences in the degree of success of the adoption of solar energy technology (due to the environmental benefit, the initial solar system cost, the economic savings, and the total) by the respondents with respect to the energy cost per month payable to the utility company.

The seventh hypothesis results
To verify the seventh hypothesis "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to environmental benefit, the initial solar system cost and the economic savings) due to the availability of space for solar panels" the one-way ANOVA "F" test was used to find the differences between the two variables.
From Table 20, it is evident that there are no statistically significant differences in the success of the adoption of solar energy technology (due to the environmental benefit, the initial solar system cost, the economic savings and the total) by respondents with respect to the availability of space for solar panels.

The eighth hypothesis results
To verify the eighth hypothesis, "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology due to the (environmental benefit, the initial solar system cost, the economic savings) depending upon their willingness to share solar systems with their neighbors", the independent sample "T" test was used to find the differences between the two variables.   Table 21 shows that there are no statistically significant differences in the success of adopting solar energy technology (due to the environmental benefit, the initial solar system cost, the economic savings and the total) by respondents that depend upon their willingness to share solar systems with their neighbors.

The ninth hypothesis results
To verify the ninth hypothesis, "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to the environmental benefit, the initial solar system cost, the economic savings) depending upon possibility of cost sharing of solar system installation", the one-way ANOVA "F" test was used to find the differences between the two variables. Table 22 indicates that there are no statistically significant differences in the success of the adoption of solar energy technology (due to the environmental benefits, the initial solar system cost, the economic savings and the total) by sample members that depend upon possibility of cost sharing of the solar systems installation with neighbors.

The tenth hypothesis results
To verify the tenth hypothesis, "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to the environmental benefits, the initial solar system cost, the economic savings) depending upon whether the workers already have a solar system in their house. The independent sample "T" test was used to find the differences between the two variables. Table 23 indicates that there are no statistically significant differences in the success of the adoption of solar energy technology (due to the environmental benefit,  the initial the solar system cost, the economic savings and the total) by respondents due to the fact they already have a solar system in their house.

The eleventh hypothesis results
To verify the eleventh hypothesis "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to the environmental benefit, the initial solar system cost and the economic savings) depending upon the year that the workers installed the solar systems in their house", the one-way ANOVA "F" test was used to find the differences between the two variables.
There are no statistically significant differences in the success of the adoption of solar energy technology (as measured by the environmental benefit, the initial solar system cost, the economic savings and the total) by the respondents due to the year that the employee insulated the solar systems in their house as presented in Table 24.

The twelfth hypothesis results
To verify the twelfth hypothesis, "There are statistically significant differences in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (as measured by the environmental benefit, the initial solar system cost, the economic savings) that depends upon the percent of electrical power in their houses that comes from a solar system. " The one-way ANOVA "F" test was used to find the differences between the two variables.   Table 25 indicates that there is no statistically significant difference in the success of the adoption of solar energy technology (as measured by the environmental benefit, the initial solar system cost, the economic savings and the total) by the respondents that depends upon the percentage of electrical energy supplied by solar systems in their houses.
In summary, only the third and fourth hypotheses have been accepted which shows that there is a statistically significant difference in the attitudes of the employees of Al-Shifa Medical Complex in Gaza regarding the success of adopting solar energy technology (due to the environmental benefits, the initial solar system cost, or the economic savings) depending to the type of house, in which they live and their the knowledge in renewable energy types in agreement with previous studies in particular [1,2]. The results of the hypotheses have been rejected meaning that the results do not show any relevance for the rest of attributes, which have been considered by the study to explore the employees of Al-Shifa Medical Complex in Gaza regarding their success of adopting solar energy technology. Though the costs of installing solar panels have no significantly effect in this study, as has been indicated in [3], they should be regarded as an important factor. We believe this is caused by the difference of the sample type of both studies. In our case, the sample consists of employers while in [3] the sample consists of students only.

Conclusions
The goal of this study was to ascertain the main reasons Gazan households should adopt solar energy systems in their houses, replacing traditional sources of energy. Accordingly, the attitudes of homeowners in Gaza regarding successfully implementing solar energy technology (as measured by environmental benefit, initial installation cost of solar energy systems, and solar energy economic values) due to different attributes are considered. The attributes that are used in this study are area of residence (governorate), home-ownership, type of house, knowledge of renewable energy types, use of solar panels, energy cost per month, availability of space, willingness to share a solar system with neighbors, the preexistence of a solar energy system at the home and in which year it has been installed, and the current dependency on using solar systems at local houses.
The study has been conducted on a sample consisting of 200 employees working Shifa et al. medical complex in the Gaza Strip. The questionnaire was designed and distributed to the sample electronically. The collected data have been analyzed using an SPSS program. The authors found out that the sample members use solar energy to complement the current traditional energy system. The