A space-based solar power station is based on a modular design, where a large number of solar modules are assembled by robots in orbit. The Space Solar Power Project in the US is developing
In January 2023, the Caltech Space Solar Power Project (SSPP) is poised to launch into orbit a prototype, dubbed the Space Solar Power Demonstrator (SSPD), which will test several key components of an ambitious plan to
Collecting solar power in space and transmitting the energy wirelessly to Earth through microwaves enables terrestrial power availability unaffected by weather or time of day. Solar power could be continuously available anywhere on
Wireless power transfer was demonstrated on March 3 by MAPLE, one of three key technologies being tested by the Space Solar Power Demonstrator (SSPD-1), the first space-borne prototype from Caltech''s Space
SSPD-1 was launched in January 2023 as part of the California Institute of Technology''s (Caltech) Space Solar Power Project (SSPP), the primary goal of which is to harvest solar power in space and
The Value of Our Research. The SSPS has many advantages as follows: it provides power 24 hours a day without being affected by weather conditions, unlike terrestrial renewable energy
SSPP aims to develop a PV cell with an efficiency level of 25 percent that is 100 times less expensive ($100 per square meter), 40 times lighter (0.05 kilograms per square meter), and with a specific power 33 times greater
The idea of space-based solar energy has been around since at least 1941, when the science-fiction writer Isaac Asimov set one of his short stories, "Reason," on a solar station that beamed
"Solar panels already are used in space to power the International Space Station, for example, but to launch and deploy large enough arrays to provide power to Earth, SSPP has to design and create solar power energy transfer systems that are ultra-lightweight, cheap, and flexible."
"SSPP gave us a unique opportunity to take solar cells directly from the lab at Caltech into orbit, accelerating the in-space testing that would normally have taken years to be done. This kind of approach has dramatically shortened the innovation-cycle time for space solar technology," says Atwater. MAPLE: Wireless Power Transfer in Space
Space Solar Power Project transmitters are designed to direct power toward Earth using the physical phenomenon of interference. The Brens approached Hajimiri due to his work in electronics and photonics that laid the groundwork for 5G communications and radar sensors in cars. But at first Hajimiri had reservations.
The plant, consisting of large, lightweight solar panels and a set of mirrors collecting sunlight, would be assembled in orbit by robots, and would require 68 launches of SpaceX's next-gen Starship megarocket to deliver all its components to space.
It took dozens of launches to construct the International Space Station in low-Earth orbit, and would likely require an order of magnitude more launches to assemble a solar power satellite that weighs in at many thousands of tonnes.
Hajimiri, an SSPP co-director and principal investigator, and others have estimated that space-based harvesters founded on the technology demonstrated by MAPLE could one day provide access to eight times as much solar energy on average as their terrestrial counterparts.
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