During a speech at a rally in Iowa, President Donald Trump told his supporters about the idea of installing Solar Panels on the Mexican Border walls, which he proposed to build, according to the BBC.

In March, two academics proposed the idea of a solar paneled wall in an article for the Wall Street Journal. The same idea was also proposed by an environmentalist and an academic last year in the Huffington Post.

The possibility of placing solar panels on the wall is already circulating in Washington, as President spoke about it during a private meeting with the group of Republican lawmakers on June 6, but so far Trump has not spoken about it publicly.

President said his speech in the city of Cedar Rapids in the Center for Agricultural Technology, making similar speeches in June in states of Ohio, Wisconsin, and Florida. During his election campaign, one of his main points was the idea of building along the border with Mexico.

Building a wall on the Mexico's border

According to him, solar panels could produce cheap energy and help to pay for the construction of the wall. Trump stressed that this was his idea. However, proposals to install solar panels on the wall had come to the US authorities earlier.

More than 200 companies presented their wall projects on the border, responding to the proposal of the US Department of Homeland Security.

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According to the BBC, twenty companies had been shortlisted for the wall building.

During his campaign, Donald Trump pledged to build a wall on the southern border of the United States to deter illegal immigrants, promising to take the money to build it from Mexico.

Moreover, the billionaire also promised that he would force Mexico to pay for the erection of the structure, but Mexican President Enrique Peña Nieto did not support this proposal.

Budget of the proposal

In June the founder of Gleason Partners Tom Gleason told the Washington Post that his project would generate two megawatts of electricity per mile (1.6 km), which would be enough to supply 350 homes, and the cost of the wall construction would be about $7.5 million for a mile.

Despite a number of technical problems, Trump himself insisted that the area of the southern border was one of those places where solar energy worked very well, and also expressed the opinion that covering the wall with bright panels would give it the "beautiful appearance."

The Mexican government categorically rejected the possibility of allocating funds to the wall.

In addition, Trump did not receive the approval of the Congress for his budget proposal, which provided for the construction of the wall with a length of 120 km and the cost $1.6 billion.