Relevance: GS III (Science & Technology, Space) | Source: The Hindu

1. What is happening?

Global space agencies are seriously researching a futuristic idea to solve the world’s clean energy needs: Space-Based Solar Power (SBSP).

• The Big Idea: Instead of building solar parks on land, scientists want to launch giant solar panels into space and beam the electricity down to Earth.
• The Lunar Ring Concept: A Japanese corporation has even planned to build a massive, 11,000 km-long belt of solar panels around the Moon’s equator to collect energy and beam it directly to our planet!

2. The Basics: How does it actually work?

To understand SBSP, you just need to know these three simple steps:

• Step 1 (Collect): Giant satellites covered in solar panels are launched high into space.
• Step 2 (Convert & Beam): The collected solar energy is converted into high-frequency Microwaves (invisible radio waves) or Lasers. This energy beam is safely fired down toward the Earth.
• Step 3 (Receive): On the ground, a massive net of special antennas called a Rectenna (Rectifying Antenna) catches the microwave beam, turns it back into normal electricity, and sends it to our cities.

3. Why go to space? (The Big Benefits)

Why spend billions putting panels in space when we have them on Earth?

• 24/7 Non-Stop Power: Earth-based solar panels sleep at night and struggle during monsoons. In space, there is no weather and no night. Satellites can collect pure sunlight 24/7.
• No Atmospheric Blockage: Earth’s atmosphere naturally blocks and scatters a lot of sunlight. In the vacuum of space, panels get 100% unfiltered, highly concentrated solar energy.
• Saves Farming Land: Generating massive solar power on Earth requires thousands of acres of land. SBSP solves this by moving the power plant into space, saving our land for agriculture.

4. The Reality Check: Why aren’t we doing it yet?

This amazing technology faces a few massive practical hurdles:

• Insane Costs: Sending thousands of tonnes of heavy hardware into space on rockets requires thousands of crores of rupees.
• The Space Junk Threat: Earth’s orbit is heavily cluttered with fast-moving trash (dead satellites). A single crash with “space junk” could destroy a billion-dollar solar array in seconds (a threat known as the Kessler Syndrome).
• Energy Loss: Beaming power from space through Earth’s atmosphere is not 100% efficient. A significant amount of energy is lost as heat along the way.

The “UPSC Trap”

• The “Lunar Ownership” Trap: A statement might claim that a country can legally capture a part of the Moon to build these solar rings. Incorrect. The global Outer Space Treaty (1967) strictly bans any nation from claiming ownership of the Moon or any celestial body.

UPSC Value Box

With reference to Space-Based Solar Power (SBSP) and global space governance, consider the following statements:

1. SBSP relies on a ground-based infrastructure called a “Rectenna” to convert beamed microwave energy back into direct current (DC) electricity.
2. The International Telecommunication Union (ITU) is the designated global agency responsible for allocating safe microwave frequencies for space-to-Earth power transmission.
3. Under the Outer Space Treaty of 1967, a sovereign nation is permitted to claim exclusive territorial rights over lunar regions for renewable energy projects.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 2 and 3 only

(c) 1 only

(d) 1, 2 and 3

Correct Answer: (a)