Renewable vs non renewable is a debate stuffed with opinions and short on numbers. This guide compares them on cost, emissions, capacity, growth, and trajectory using published data. Nothing polemical; just the numbers.
Definitions
- Renewable. Naturally replenished on human timescales: solar, wind, hydro, geothermal, biomass.
- Non renewable. Depleted at extraction rate: coal, oil, natural gas, uranium.
- Low carbon. Nuclear is non renewable but low carbon.
Cost comparison LCOE
| Source | USD per MWh 2025 |
|---|---|
| Solar PV (strong resource) | 20 to 40 |
| Onshore wind (strong resource) | 30 to 50 |
| Coal (existing) | 40 to 70 |
| Natural gas combined cycle | 40 to 80 |
| Nuclear (existing) | 30 to 70 |
| Coal (new build) | 60 to 150 |
| Nuclear (new build) | 70 to 150 |
| Offshore wind | 60 to 100 |
Emissions comparison
| Source | gCO2 per kWh lifecycle |
|---|---|
| Wind | 8 to 20 |
| Nuclear | 10 to 30 |
| Solar PV | 25 to 50 |
| Hydro (reservoir higher) | 4 to 40 |
| Geothermal | 15 to 55 |
| Bioenergy (contested) | 10 to 100 |
| Natural gas | 400 to 500 |
| Coal | 800 to 1200 |
Growth rates 2013 to 2023
| Source | Annual growth |
|---|---|
| Solar | +27% |
| Wind | +13% |
| Nuclear | +1% |
| Gas | +2% |
| Coal | +1% |
| Oil (electricity) | Slight decline |
Reliability
| Source | Capacity factor | Dispatchable |
|---|---|---|
| Solar | 12 to 28% | No |
| Onshore wind | 25 to 45% | No |
| Offshore wind | 40 to 55% | No |
| Hydro (reservoir) | 35 to 60% | Yes |
| Nuclear | 85 to 95% | Yes |
| Gas | 50 to 80% | Yes |
| Coal | 50 to 80% | Yes |
| Geothermal | 75 to 90% | Yes |
Current global mix
See our companion article on global electricity mix 2026.
Trajectory to 2050
Water use
| Source | Water use (litres per MWh) |
|---|---|
| Solar PV | Under 100 |
| Wind | Under 100 |
| Nuclear | 2500 to 3500 |
| Coal | 1500 to 2500 |
| Gas combined cycle | 800 to 1200 |
Land use
| Source | Land (m2 per MWh per year) |
|---|---|
| Solar PV | 15 to 40 |
| Wind (full site) | 50 to 150 |
| Nuclear (site) | 1 to 5 |
| Natural gas (site) | 1 to 3 |
| Coal (site plus mine) | 5 to 50 |
Jobs
Renewables create more jobs per MW installed than fossil generation. Solar and wind together employ over 15 million globally. Fossil fuel electricity generation employs roughly 5 million.
Reserves
Non renewable reserves are finite. Coal will last centuries at current use; oil and gas decades. Renewables are effectively unlimited on human timescales. This is definitional not comparative.
Net zero pathway
IEA net zero pathway requires renewables plus nuclear at 90+ percent by 2050. Coal essentially phased out. Gas remaining only with CCS. This is the direction of published scenarios.
Reality check
Current trajectory is behind IEA net zero pace. Coal decline in India and China is the biggest uncertainty. Reality is closer to a slower net zero pathway than either extreme scenario.
Frequently asked questions
Is renewable really cheaper?
Solar and wind in strong resource regions yes. New build cheaper than new coal or gas.
Is renewable really cleaner?
Yes on lifecycle emissions. Wind is the lowest.
Can renewables replace fossil?
Combined with storage, transmission, and demand flexibility, yes for majority share.
What about nuclear?
Non renewable but low carbon. Complementary to renewables.
Is coal dying?
Slowly. Growth flat. Existing plants persist for decades.
Is gas transitional?
Often argued yes but methane leakage undermines the case.
Which grows fastest?
Solar by a wide margin.
Where can I read more?
IEA World Energy Outlook, Ember Global Electricity Review.
Is 100 percent renewable realistic?
For electricity yes with right conditions. For total energy including transport and heat, requires substantial electrification.
What is the bottom line?
Numbers favour renewables on cost and emissions. Trajectory continues shifting toward renewables.
Summary
Renewables now beat fossil fuels on new build cost in most markets. Emissions per MWh are 10 to 50x lower for renewables. Growth rates favour renewables 10x. Land and water use vary. The overall picture favours a decisive shift toward renewables, complemented by nuclear where politically viable, with fossil generation declining. Speed of transition is the remaining question.
Next reading
- Renewable energy complete guide
- Global electricity mix 2026
- Renewable energy types ranked
- Browse the UtilityRadar directory
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