Peat Harvesting

Peat is partially decomposed plant matter that accumulated in waterlogged bogs, and as a fuel it sits between wood and coal in energy density, requiring no trees, mining equipment or processing beyond cutting and drying. Quality depends on decomposition: lightly decomposed fibrous peat from the top 30-50 cm burns poorly with lots of smoke, while highly decomposed black peat from the deepest layers is the best fuel.

Peat is partially decomposed plant matter that has accumulated in waterlogged bogs over thousands of years. As a fuel, it sits between wood and coal in energy density. In regions with peat bogs — Ireland, Scotland, Scandinavia, Russia, northern North America — it has been a primary fuel source for millennia and can be again. It requires no trees, no mining equipment, and no processing beyond cutting and drying.

Finding & Identifying Peat Bogs

Bog Types

Peat forms wherever plant growth exceeds decomposition, which happens in waterlogged, acidic conditions:

Blanket bogs: Spread across flat or gently sloping uplands in wet climates. Often 1-5 meters deep. Most common in maritime climates (Ireland, Scotland, western Norway)
Raised bogs: Dome-shaped deposits in lowlands, fed entirely by rainwater. Can be 10+ meters deep. Found across northern Europe and North America
Fen peat: Forms in groundwater-fed wetlands. More nutrient-rich than bog peat, often too wet and crumbly for good fuel

How to identify a potential peat bog:

Look for flat, treeless wetland areas with sphagnum moss, heather, and cotton grass
The ground feels spongy underfoot
Water is stained brown/amber (tannic acid from peat)
Cut into the surface with a knife — dark brown or black fibrous material below the living vegetation

Testing Peat Quality

Not all peat burns well. Quality depends on decomposition level:

Lightly decomposed (fibrous, light brown, visible plant structures): Low energy content, lots of smoke, difficult to burn. Found in the top 30-50 cm
Moderately decomposed (dark brown, some fiber): Good fuel. The bulk of most bogs
Highly decomposed (black, dense, almost like coal): Best fuel, highest energy. Found in the deepest layers

Squeeze test: Take a handful and squeeze hard. If mostly water runs clear — too fibrous. If dark, muddy water runs out and the peat holds its shape — good fuel quality.

Depth Assessment

Push a long rod (metal rod, straight stick) into the bog to find the mineral soil beneath:

Less than 50 cm: Marginal — mostly low-quality surface peat
50-200 cm: Workable fuel source
200+ cm: Major resource — years or decades of fuel supply

Cutting & Extraction

Hand Cutting Tools

The traditional peat-cutting tool is a slane (also called a “tuskar” or “slean”) — a spade with an L-shaped blade that cuts a rectangular block in one motion. If you lack a slane:

A standard spade works but is slower (cut blocks in two cuts rather than one)
A machete or large knife can cut pre-scored blocks
The key is producing uniform blocks that stack and dry evenly

Cutting Technique

Strip the turf: Remove the top 10-20 cm of living vegetation and set aside (replace after harvesting to allow regrowth)
Open a bank: Cut a vertical face into the peat to work from. The bank should be 60-100 cm high
Cut blocks: Standard size is roughly 30 x 10 x 10 cm (length x width x depth). Consistency matters more than exact dimensions
Toss to dry: Throw each cut block onto the adjacent ground surface to begin drying
Work systematically: Cut one layer across the bank face, then step down to cut the next layer
Stop above the mineral base: Leave 10-20 cm of peat above the underlying clay/gravel to allow regeneration

Bank Management

Work from one direction and don’t create isolated pillars — they collapse
After harvesting a section, replace the turf cap to promote sphagnum regrowth
Rotate cutting areas — never exhaust a single bank. Move to a new face each year
A single person cuts 1,000-1,500 blocks in a full day once practised, and 400-700 while learning — the figures in the labour table below. (An earlier version of this line said 1,000-2,000, which did not match that table.)

Drying & Curing

Freshly cut peat is 80-90% water by weight. It must be dried to below 30% moisture to burn well.

Drying Stages

Week 1-2: Initial drying (“spreading”)

Lay blocks flat on the ground in a single layer, spaced apart
Turn every 2-3 days
The surface crusts while the interior remains wet

Week 3-4: Footing

Stand 4-6 blocks upright, leaning against each other in small teepee shapes
Air circulates around all surfaces
This is the critical stage — blocks must not sit in water

Week 5-8: Stacking (“clamping”)

Build larger stacks (“clamps” or “ricks”) — criss-crossed blocks with gaps for airflow
Cover the top with sod or a tarp to shed rain while allowing sides to breathe
In good weather, peat is ready to burn after 6-8 weeks total drying

Weather Dependency

Peat drying is entirely weather-dependent:

Ideal: Warm, windy, dry weather (summer in temperate regions)
Acceptable: Intermittent rain is fine if blocks are footed (standing) — they shed water
Problem: Extended wet weather during the spreading phase ruins the season’s harvest. Time your cutting for the driest forecast period

In wet climates (Ireland, Scotland), peat cutting traditionally begins in April-May for an August harvest.

Burning Characteristics

Energy Content

Fuel	Energy (GJ/tonne, air-dried)	Density (kg/m³, air-dried)
Well-dried peat	14-16	300-500
Air-dried hardwood	15-17	500-800
Coal (bituminous)	24-30	1,100-1,500

This column was previously headed “dry”, which it is not — its own middle row says “air-dried”. Oven-dry peat is nearer 19-20 GJ/t net, so read 14-16 as peat at roughly 15-25% moisture, which is what a good summer’s drying gets you. BTU Content Compared to Wood works the moisture correction through.

Peat is roughly equivalent to wood by weight but less dense — you need more volume. However, it is usually far more abundant locally than standing timber and regenerates (very slowly) while trees take decades to regrow.

Burning Behavior

Slow, steady burn: Peat burns slowly with a long-lasting ember bed. Excellent for overnight heating
Good coals: Produces fine, hot coals that retain heat for hours
Smoke: More smoke than seasoned wood, especially if not fully dry. Burns best in a stove with good draft
Ash: Produces moderate ash (5-15% by weight). Peat ash is mildly alkaline — useful as a soil amendment or for soap making
Smell: Distinctive, pleasant smell. Peat smoke has been used for centuries to flavor whiskey and smoked foods

Stove Compatibility

Peat burns best in:

Any wood-burning stove with a grate and ash pan
Rocket stoves (break peat into small chunks first)
Open fireplaces (traditional Irish method — stack blocks in a pyramid shape)
Avoid using in stoves designed exclusively for coal — peat needs more airflow

Environmental Considerations

Regrowth Rate

Peat accumulates at roughly 0.5-1 mm per year in ideal conditions. A 2-meter-deep bog took 2,000-4,000 years to form. This means peat is effectively a non-renewable resource on human timescales. However, in a post-collapse context with drastically reduced population:

A modest bog can supply a small community for decades
Selective harvesting with turf replacement allows partial regeneration
Peat should be viewed as a transitional fuel — used while establishing coppiced woodlands and other renewable energy sources

Sustainable Harvesting Limits

Never drain a bog entirely — draining destroys the ecosystem permanently
Harvest only from the edges, leaving the center intact
Replace turf caps after cutting
Rotate cutting areas with 20-30 year rest cycles
A 1-hectare bog with 2 metres of peat is 20,000 m³ (10,000 m² × 2 m). Work the budget in volume rather than tonnes, because the density table above is for cut and dried blocks at 300-500 kg/m³ and peat sitting in a waterlogged bog is far lighter than that per cubic metre — applying 300-500 to the bog would give 6,000-10,000 tonnes, which is why a tonnage figure here is easy to get wrong by a factor of two.
At this article’s own block size of 30 × 10 × 10 cm, a household’s 5,000-8,000 blocks a year is 15-24 m³. So 20,000 m³ is centuries for one household and roughly 8-13 years for a hundred households. Those two numbers are the point: a bog is effectively limitless for a family and quite small for a village, which is exactly why cutting rights were allotted by the strip and fought over. Halve both figures for what you can realistically reach and lift, leaving the margins and the base intact

Peat for Non-Fuel Uses

Beyond burning, peat has several valuable applications:

Garden soil amendment: Peat improves soil structure, increases water retention, and lowers pH for acid-loving plants (blueberries, potatoes, rhododendrons)
Insulation: Dry peat is a reasonable thermal insulator. Historically used to insulate ice houses and root cellars. Pack between double walls or under roof
Water filtration: Sphagnum peat has natural antimicrobial properties and can serve as a biological water filter (slow sand filter with peat pre-filter layer)
Wound dressing: Sphagnum moss (the living top layer of peat bogs) was used extensively in World War I as wound dressings — it is naturally antiseptic and highly absorbent. Dry it and keep in your first aid supplies
Preservation: The anaerobic, acidic environment of peat bogs preserves organic materials for millennia (“bog butter,” preserved leather, even human bodies). A useful natural cold storage for certain items

Labor Estimate

A realistic assessment of the work involved:

Task	Output	Time
Cutting (experienced)	1,000-1,500 blocks	Full day
Cutting (beginner)	400-700 blocks	Full day
Footing (setting up to dry)	2,000 blocks	Half day
Stacking into clamps	3,000 blocks	Half day
Transport to house (100m)	500 blocks by wheelbarrow	Half day

One household needs roughly 5,000-8,000 blocks per year for cooking and heating (with an efficient stove). Add the table up rather than guessing at the total:

Stage	Rate per full day	Days for 5,000	Days for 8,000
Cutting (experienced)	1,000-1,500	3.3	8.0
Footing	4,000	1.3	2.0
Stacking into clamps	6,000	0.8	1.3
Transport, 100 m by wheelbarrow	1,000	5.0	8.0
Total		about 10 days	about 19 days

So 10 to 19 days of labour, not the 8 to 15 an earlier version of this line claimed. The number worth noticing is the last row: carting the blocks home is a third to a half of the whole job — as much as the cutting — and it scales with distance. A bank 300 m away rather than 100 m can cost you more days than the cutting does. Choose the bank for the haul, not just for the peat.

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