02 — Green energy explorer

Not all clean energy is clean in the same way

Every source below carries a different mix of lifecycle emissions, ecological impact, intermittency and grid dependence. The useful question is rarely "is it green" but "green under which conditions, and for how many hours a day".

Hydroelectric

Gravity and stored water converted to rotational power, dispatchable within seconds where reservoirs exist.

Strengths
Very low marginal cost, long asset life, real storage when reservoirs are deep.
Geography
Requires elevation change plus dependable precipitation or glacial melt.
Reliability
Firm with reservoirs; strongly seasonal for run-of-river schemes.
For mining
The strongest fit for continuous load — most industrial-scale mining sits on hydro.

River ecology, sediment loss and displacement are real costs, and drought years can halve output.

Cost92
Consistency84
Scalability62

Solar

Photovoltaic conversion with no moving parts and a cost curve that has fallen further than any other source.

Strengths
Fast to deploy, modular, near-zero operating cost, excellent daytime economics.
Geography
Irradiance-driven — deserts and high plateaus far outperform temperate latitudes.
Reliability
Intermittent and diurnal; without storage the useful window is roughly six to nine hours.
For mining
Attractive for curtailed midday surplus; poor as a standalone 24-hour supply.

Manufacturing emissions, land use and end-of-life panel handling are unresolved at scale.

Cost88
Consistency38
Scalability94

Wind

Kinetic extraction from atmospheric pressure gradients, onshore and increasingly offshore.

Strengths
Very low lifecycle emissions, strong nighttime output, high capacity factors offshore.
Geography
Needs sustained mean wind speeds — coastlines, plains and offshore shelves.
Reliability
Intermittent, but less correlated with demand peaks than solar.
For mining
Works well for flexible, interruptible load that can absorb curtailment.

Grid congestion, avian impact and blade recycling remain genuine constraints.

Cost82
Consistency46
Scalability86

Geothermal

Heat drawn from crustal reservoirs, delivering renewable output that ignores weather entirely.

Strengths
True renewable baseload with capacity factors above 90 percent.
Geography
Restricted to tectonically active zones unless enhanced systems are drilled.
Reliability
Among the most consistent of all renewable sources.
For mining
Excellent — constant output and low tariffs where fields already exist.

Wells deplete, drilling risk is high, and some fields vent CO2 and hydrogen sulphide.

Cost71
Consistency95
Scalability44

Tidal and wave

Gravitational and swell energy captured at coastlines — predictable centuries in advance.

Strengths
Forecastable to the minute, extremely dense working fluid.
Geography
Needs high tidal range or persistent swell — a short list of estuaries and coasts.
Reliability
Cyclical but perfectly predictable; output follows the lunar phase, not demand.
For mining
Marginal today; interesting only where paired with storage or a wider grid.

Capital cost per MW remains the highest of any renewable, and estuarine habitats suffer.

Cost34
Consistency72
Scalability26

Biomass and biogas

Combustion or digestion of organic residue, agricultural waste and landfill gas.

Strengths
Dispatchable, uses existing thermal plant, diverts methane from the atmosphere.
Geography
Follows agriculture, forestry and dense waste streams.
Reliability
Firm and controllable as long as feedstock logistics hold.
For mining
Useful at small scale near a feedstock source; rarely competitive at grid scale.

Only low-carbon when the feedstock is genuine residue — purpose-grown fuel often is not.

Cost58
Consistency79
Scalability41

Nuclear

Fission heat producing the densest low-carbon baseload available at industrial scale.

Strengths
Highest capacity factor of any source, tiny land and material footprint per MWh.
Geography
Needs cooling water, grid depth, capital and a durable regulatory environment.
Reliability
Near-continuous, with scheduled refuelling outages.
For mining
Low-carbon and stable — but retail tariffs in nuclear-heavy markets are often high.

Low-carbon is not the same as renewable: fuel cycles, long build times and waste custody all persist.

Cost46
Consistency97
Scalability55

Waste-energy recovery

Capturing energy that would otherwise be vented — flare gas, industrial heat, pressure differentials.

Strengths
Turns a liability into output, often with immediate emissions benefit.
Geography
Located wherever the waste stream already is — refineries, mines, landfills.
Reliability
Depends entirely on host-process uptime.
For mining
One of the few genuinely additive fits: compute placed exactly where energy is stranded.

It reduces waste rather than eliminating the underlying fossil process.

Cost74
Consistency63
Scalability37