Crypto power: Can solar boost cheap, green homes in S.Africa?

After the 2008 economic recession hit, Carla Walker-Miller shifted her energy services business model to not only supply electrical equipment but also implement energy efficiency programs for communities of color in Detroit. She has been able to service 75 households, which has resulted in energy bill savings up to $600 a year for families. The company also has a robust recruitment and training program for young people and those experiencing economic hardship.

Inspired by the Dutch concept of “Energiesprong,” or “energy jump,” a developer in France retrofitted a group of townhouses for social housing to be more environmentally friendly. They installed polyurethane facades to avoid heat loss and solar panels on the roof. Upgrading the units to be more green cost more than a conventional retrofit, but over time, energy bills were cut in half. These green retrofits are being implemented in towns around the world and could be a model for developers that want to reduce their carbon footprints.

An apartment complex in Utah includes a solar battery in every apartment allowing the resident, power utility, and building developer to save costs for generating electricity. Through a unique partnership, the power systems can provide 12.6 megawatts of power for the building, which translates into residents saving up to 40 percent on the energy bills. This setup might not be easy to scale, but the developer plans to expand the model in other states.

Apartments at Front Flats, a new residential building in Philadelphia, is powered by 492 solar panels that are wrapped around the building. The point: to demonstrate that developers can design buildings that are energy-efficient and be built at an affordable cost. It’s not clear yet if the building is “net zero” in terms of producing as much energy as it consumes, but residents are paying only $40 a month for utilities.

A cryptocurrency mining company in Texas called Layer1 can power down its data-processing centers and sell its unused electricity back to the power grid. Instead of passively consuming energy, they are able to utilize batteries, smart meters, and artificial intelligence software to use more renewable energy and, at the same time, make a profit. While scaling this response can be difficult due to restrictions from utility companies on how consumers get their energy, Layer1 estimates it will save up to $6.7 million annually by cutting production for 30 minutes during some of the hottest days in the summer.

Once largely confined to the desert Southwest, solar power is making its way across the United States. Due to decreasing prices in installations, coupled with government incentives and increasing knowledge of energy harvesting capabilities, solar has recently found its way into places such as Idaho, Maine, Alabama, Iowa, Kentucky, and Nebraska - with places like Georgia and Florida are looking to expand. Despite the pushback from the newest presidential administration, even cynics of the solar power movement are declaring it the most viable option.

The Hydropower Empowerment Network takes a country-by-country approach to helping establish micro hydro and other technologies in rural places where electricity is difficult to come by. Micro hydro has even proven to be more durable and sustainable than solar, though solar is cheaper and quicker to install - the reason is the depth of community involvement required. When villagers participate on longer-term, complex projects, they develop pride in their work, learn invaluable new skills, and are empowered to engage with the solution.

A collaborative partnership among local and national organizations made it possible to install solar panels on 10 Greensboro homes for free. Because of this effort, many low-income families have seen a significant decrease in their energy bills and an increase in value of their homes. Although convincing people to install the panels was a challenge, organizers are now figuring out how to scale the initiative and make it sustainable in the longterm.

A team of Finnish engineers havevinstalled the first commercial battery made of sand, which can store green energy in it for months. Solar panels or wind turbines generate electricity, which is then stored as heat in the sand battery. When needed, the battery can discharge hot air to heat up water which is then used to heat homes, offices, and a swimming pool. This solution may be difficult to scale, but it’s a low-cost storage idea that could be useful when it’s cold and energy is more expensive.

Solar energy is a clean, cheap, renewable, and land-efficient resource, making it a valuable technology to scale up in the face of climate concerns and clean energy. Diversifying the supply chain for creating and sourcing solar panels can help make solar energy more reliable when faced with geopolitical and human rights issues.