What it is: RNG is captured from landfills, farms, and wastewater treatment plants, cleaned, and fed into pipelines.
Benefits:
- Prevents methane leakage into the atmosphere
- Works with existing gas infrastructure
- Converts waste into usable energy
Limits:
- Supply potential: Only 5–10% of current U.S. natural gas demand could realistically be met with RNG (EPA, 2023).
- Higher cost per unit vs. fossil gas
- Still emits CO₂ when burned
RNG is helpful, but not a silver bullet.
Energy Economics: Gas vs. Renewables
| Energy Source | Average Cost (USD/MWh, 2023) | Lifecycle CO₂ Emissions (g/kWh) | Renewability | Notes |
| Natural Gas | $45–70 | 400–500 | Nonrenewable | Flexible, but finite |
| Coal | $65–120 | 800–1000 | Nonrenewable | Declining globally |
| Solar PV | $25–45 | ~20 | Renewable | Costs dropped 85% since 2010 |
| Onshore Wind | $30–50 | ~12 | Renewable | Rapidly scalable |
| Nuclear | $50–100 | ~15 | Nonrenewable (fuel finite) | Reliable, low-carbon |
| Hydropower | $40–90 | ~24 | Renewable | Location-dependent |
This table clarifies why solar and wind are rapidly overtaking natural gas in new energy investments.
Carbon Capture and Storage (CCS): Can Gas Survive Longer?
Some argue that carbon capture and storage (CCS) could extend natural gas’s role. CCS captures CO₂ at power plants and buries it underground.
- Potential: Could cut emissions from gas plants by up to 90%.
- Reality: As of 2024, global CCS capacity is under 50 million tonnes annually, compared to 33 billion tonnes of global CO₂ emissions.
- Criticism: Expensive, energy-intensive, and unproven at the scale needed.
While CCS might buy time, it cannot replace a full-scale transition to renewables.
Natural Gas in Global Energy Security
Gas provides stability—but also geopolitical risk.
- Russia–Europe crisis (2022–23): Gas cutoffs triggered record-high energy prices and exposed dependency vulnerabilities.
- Asia-Pacific: LNG imports have surged, increasing exposure to global market swings.
Renewables, by contrast, decentralize supply and reduce geopolitical leverage.
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