Solar-btm, an abbreviation for solar “behind-the-meter,” refers to a decentralized form of solar energy generation that functions on the consumer's side of the electricity meter. Unlike solar farms or large-scale solar projects, solar-btm typically involves rooftop solar panels installed on residential, commercial, or industrial buildings. This form of energy empowers individuals and businesses to generate their own clean electricity, often resulting in cost savings and increased energy independence. It plays a crucial role in the transition to sustainable energy systems by allowing widespread adoption of solar energy on a personal and local level.

The process of generating electricity through solar-btm systems involves converting sunlight directly into electricity using photovoltaic (PV) cells. These cells, made from semiconductor materials such as silicon, capture photons from sunlight and release electrons, generating an electric current. The electricity produced can be used immediately, stored in batteries for later use, or even fed back into the grid if the system generates more electricity than needed. By harnessing the sun's abundant energy, solar-btm systems provide clean and renewable electricity, contributing to a greener and more resilient energy grid.

One of the primary advantages of solar-btm is its low carbon intensity. With a carbon intensity of 45 gCO2eq/kWh, solar energy stands out as a significantly cleaner option compared to fossil fuel sources like coal, which has a carbon intensity of 820 gCO2eq/kWh, and oil at 650 gCO2eq/kWh. The reduced carbon emissions from solar-btm contribute to mitigating climate change and improving air quality, aligning with global efforts to transition towards sustainable energy systems. This makes solar, along with other low-carbon energy sources like wind and nuclear, an integral component of achieving a cleaner energy future.

Solar-btm is seeing encouraging growth in certain locales, demonstrating its potential to become a key player in electricity generation. While it currently generates close to none of the global electricity, it is making notable contributions in specific regions. For instance, Hawaii generates 14% of its electricity from solar-btm, while Maine and California stand at 8% and 12%, respectively. Furthermore, in Arizona and Nevada, solar-btm accounts for 5% of electricity generation. This growing contribution highlights the potential of solar-btm to significantly reduce carbon emissions in traditionally fossil-fuel-reliant areas.

The shift towards low-carbon technologies such as solar and nuclear is reshaping the energy landscape. Both sources embody the principles of clean, sustainable, and green energy, offering reliable alternatives to fossil fuels. The scalable and diverse nature of solar-btm, alongside the robustness of nuclear energy—known for its low carbon intensity of just 12 gCO2eq/kWh—presents promising pathways to meeting our increasing electricity demands. Collectively, expanding these technologies will enable a more resilient and environmentally-friendly electricity system, driving a future powered by clean energy.