Delaware Propane Price 2026: Cost Per Gallon, Suppliers & Delivery

Delaware residential propane runs $3.73/gal in 2026, roughly 40% above the national mark and tied with Vermont and Maryland as the 7th-most-expensive US state. EIA groups Delaware with the South, but the price tier is squarely Northeast. This is the no-spin breakdown: why DE prices sit where they do, fill-by-tank-size math, DEAP/LIHEAP eligibility, the Sussex County poultry-and-coast demand picture, and how to find a State Fire Marshal-permitted supplier.

Latest EIA residential propane price

Source: EIA Delaware residential propane price survey. Current data is the final release of the 2025/26 heating season (week ending 30 March 2026). EIA pauses weekly publication April-September; next release expected October 2026. Refreshed 26 May 2026.

Delaware Propane Pricing Snapshot (2026)

Delaware residential avg

$3.73/gal

EIA SHOPP weekly survey, full-service residential delivery

vs national average

+40%

National avg $2.67/gal. Delaware pays $1.06 more per gallon than the US norm.

vs South region avg

+14%

South region avg $3.26/gal. EIA groups DE with the South; pricing-wise it sits in the Northeast tier.

Annual fuel cost (1,000 gal)

$3731

Typical DE propane-heat household uses 800-1,200 gal/year

500-gallon refill (400 usable)

$1492

Most common residential tank size in Delaware

Pre-buy savings (May-Aug)

$300-$500/yr

Lock-in or cap-price contracts beat winter spot pricing

At $3.73/gal Delaware ties Vermont and Maryland as the 7th-most-expensive US state for residential propane. Drivers are structural: rural Sussex County agricultural demand from the country's largest broiler-chicken-producing county, Atlantic-coast seasonal-tourism propane demand on the Lewes-Rehoboth-Bethany corridor, natural-gas dominance in Wilmington / New Castle / Newark / Dover that suppresses dense urban propane competition, and distance from Gulf production via the Marcus Hook NGL terminal in southeast Pennsylvania.

Why Delaware Propane Prices Sit Where They Do

Delaware is one of the more confusing pricing markets in the EIA SHOPP dataset. Census/EIA classification puts Delaware in the South region (regional average $3.26/gal), but at $3.73/gal the state prices like New Hampshire or Rhode Island, not like Virginia or North Carolina. Four structural drivers explain the gap.

1. Distance from Gulf production via Marcus Hook. Most US propane is produced on the Gulf Coast and in the Marcellus/Utica shale (PA/OH/WV). Delaware retailers source through the Marcus Hook NGL terminal in southeast Pennsylvania, which is fed by Mariner East pipeline NGL flows from the Marcellus and by rail from PADD 3. Every transfer (pipeline-to-storage, storage-to-rail, rail-to-bobtail-truck) adds a margin layer before retail markup.

2. Natural-gas dominance in the population centres. Wilmington, Newark, New Castle, and Dover are dominated by Delmarva Power (electric and gas) and Chesapeake Utilities natural-gas service. That eliminates urban residential propane demand from the populous I-95 corridor, leaving the propane customer base concentrated in rural Sussex County and the bayside / Atlantic-coast strip. A smaller, more dispersed customer base supports thinner supplier route density and less price competition.

3. Sussex County agricultural propane demand. Sussex is the largest broiler-chicken-producing county in the United States. Propane brooders heat new flocks for the first 14-21 days of each cycle, irrigation engines run on propane through summer, and grain dryers consume propane through autumn harvest at Bombay Hook / Prime Hook agricultural land. That demand competes for the same supplier capacity that serves residential customers and supports higher per-gallon margin in Sussex zip codes.

4. Heating-oil legacy in older Delaware homes. A meaningful share of older Delaware housing stock, particularly mid-century homes in Kent County and inland Sussex, still runs #2 fuel oil for space heat, with propane as a secondary fuel for cooking, water heat, or a generator. That keeps the propane gallons-per-household below what a propane-dominant state like West Virginia would see, weakening per-customer route economics.

Delaware Propane Fill Costs by Tank Size (at $3.73/gal)

Propane tanks fill to 80% of stated capacity (the "80% rule") to allow for thermal expansion. NFPA 58 mandates this; it is not a supplier markup. Below is what each fill costs at the Delaware 2026 average. Real-world quotes vary 10-15% above or below the EIA average depending on supplier, contract type, and delivery frequency.

Tank size	Usable gallons (80%)	Fill cost at $3.73/gal	vs national ($2.67/gal)
100 gal	80 gal	$298	+$85
250 gal	200 gal	$746	+$211
500 gal	400 gal	$1492	+$423
1000 gal	800 gal	$2985	+$846

Compare to the national refill cost guide or check pricing in other states.

Delaware Heating Season & Annual Use

Delaware's residential heating season runs roughly five months, late October through March, with peak demand in January and February. The state straddles two climate zones: New Castle County (Wilmington, Newark) sits in IECC Zone 4A with around 4,200 heating degree-days per year, while southern Sussex (Lewes, Rehoboth, Selbyville) sits closer to 3,800 HDD. The result is a heating load that is meaningful but milder than New England.

Typical Delaware propane-heat households consume 800-1,200 gallons per year, depending on house size, insulation, and how much of the load is propane versus heating oil or electric. A 2,400 sqft home in Kent County with propane handling space heat, water heat, range, and dryer averages 1,000-1,100 gallons. A propane-only-for-cooking-and-water-heating household, with electric or oil for space heat, runs 150-300 gallons annually.

Translated to dollars at the 2026 Delaware average: a 1,000 gallon household pays $3731 per year for fuel alone, before tank rental fees, delivery surcharges, or service contracts. That is $1057 more than a comparable household at the national average and around $1551 more than a Texas household at the cheapest US end.

DEAP / LIHEAP assistance for income-qualified households. The Delaware Energy Assistance Program (DEAP), administered by Delaware Department of Health and Social Services (DHSS), Division of State Service Centers, covers propane and other deliverable fuels for households at or below 60% of State Median Income. FY2026 heating benefit ranges $100-$2,464; cooling $1-$1,000; crisis up to $10,000. Heating window October 1 to April 30. Apply online at dhss.delaware.gov/dss/liheap, call 1-302-255-9675, or dial 211. County intake: New Castle 302-654-9295, Kent 302-674-1782, Sussex 302-856-6310.

Summer pre-buy is the single biggest lever. Pre-buying or capping in May-August routinely saves $300-$500 per year for a 1,000 gallon household versus paying winter spot rates. Most Delaware suppliers run their pre-buy enrollment between May 1 and August 31. Read the fine print: cap-price contracts let you keep savings if wholesale falls; flat pre-buy locks you in either direction. Time your fall fill in late September after Labor Day, not December, to lock in shoulder-season pricing.

How to Find a Licensed Propane Supplier in Delaware

Buying propane from an unlicensed dealer is both a safety risk and a consumer-protection risk. In Delaware the regulatory authority is split: the Delaware State Fire Marshal enforces the LP-Gas Code (NFPA 58) and permits tank installations and bulk plants, while the Delaware Department of Agriculture (DDA) Weights and Measures Section enforces meter accuracy on every delivery truck. Three reliable starting points to find a verified supplier:

Mid-Atlantic Propane Gas Association (MAPGA), the regional trade association covering Delaware and Maryland (~86 member companies, ~243,000 retail accounts, 80,000 primary-heat customers in the two-state region). Member directory at mapga.org. MAPGA membership is voluntary, but it's the cleanest filter for established Delaware-active suppliers.
Delaware State Fire Marshal, every retail LPG dispensing site and every bulk plant operating in Delaware must hold a permit issued by the State Fire Marshal under the Delaware Fire Prevention Regulations. Contact: statefiremarshal.delaware.gov or 302-739-5665. Tank-plan submittals are public record.
National Propane Gas Association (NPGA), the national-level member directory at npga.org lists licensed propane retailers across all 50 states and is a useful cross-check against MAPGA.

Always get a written quote that itemises per-gallon price, delivery fee, tank rental (if applicable), minimum-delivery surcharge, and any monthly tank fee. Compare two or three quotes before committing. Per-gallon spreads of $0.30-$0.50 within the same Delaware county are common, particularly between Sussex agricultural-route suppliers and Kent / New Castle residential-only suppliers.

Tier-1 supplier list coming. A hand-curated list of named Delaware propane suppliers (with HQ, coverage area, and notes on contract types) is in our editorial pipeline. We publish supplier lists only once each name has been verified against the official state licensed-dealer list and the supplier's active service-area page. We do not generate supplier names from training data; that is a hallucination risk we treat seriously.

Delaware vs Other South-Region States (2026)

EIA classifies Delaware in the South Census region. The table below shows every South-region state ranked by 2026 EIA SHOPP residential price. Note that Delaware sits at or near the top of the South cluster despite the regional grouping, its pricing logic is closer to the Northeast tier.

State	Price/gal	500-gal refill (400 usable)	vs national ($2.67)
Florida	$4.71	$1882	+76%
Maryland	$3.74	$1496	+40%
Virginia	$3.56	$1426	+33%
Alabama	$3.52	$1406	+31%
South Carolina	$3.51	$1405	+31%
West Virginia	$3.51	$1405	+31%
North Carolina	$3.45	$1380	+29%
Tennessee	$3.25	$1299	+21%
Georgia	$3.16	$1266	+18%
Mississippi	$3.05	$1221	+14%
Texas	$2.99	$1196	+12%
Kentucky	$2.94	$1174	+10%
Louisiana	$2.93	$1172	+10%
Arkansas	$2.37	$947	-11%
Oklahoma	$2.27	$909	-15%

South-region average: $3.26/gal. Delaware sits well above the South average because EIA's Census grouping treats DE as a southern state, but Delaware's supply chain (Marcus Hook NGL terminal, Northeast rail-truck transfer pattern, urban natural-gas dominance) and customer mix (rural Sussex agricultural plus Atlantic-coast seasonal) all behave like a Mid-Atlantic / Northeast market. See full state-by-state pricing for all 50 states.

Delaware Propane FAQ

How much does propane cost per gallon in Delaware?

Delaware residential propane is $3.73/gallon in the latest EIA SHOPP weekly residential survey (week ending 30 March 2026). That is +40% versus the $2.67 national average, putting Delaware tied with Vermont and Maryland as the 7th-most-expensive state in the US for residential propane. The state-level average masks meaningful intra-state variation: bulk delivered propane to a poultry operation in southern Sussex County is priced very differently from a 100 gallon top-up at a beach rental in Rehoboth, and Wilmington/New Castle full-service deliveries differ again. Always pull two or three written quotes before committing to a supplier.

Why is propane so expensive in Delaware?

Delaware sits in an awkward pricing position. EIA groups Delaware with the South Census region (regional average $3.26/gal), but at $3.73 the state actually prices like a Northeast market. Three structural drivers: first, distance from Gulf production. Delaware propane reaches retailers via the Marcus Hook NGL terminal in southeast Pennsylvania and rail-truck transfers from PADD 3 (Gulf) and the Marcellus shale, with multiple handoffs that each add a margin layer. Second, the residential customer base is small and rural-concentrated. Wilmington, Newark, and Dover are dominated by Delmarva Power and Chesapeake Utilities natural-gas service, which leaves propane demand concentrated in rural Sussex County, Kent County farmland, and the Atlantic coast resort strip. That smaller, more dispersed customer base supports thinner supplier route density and less price competition. Third, heating-oil legacy. Many older Delaware homes still run #2 fuel oil for space heat, so propane is often a secondary or supplemental fuel, weakening the per-gallon economics versus a propane-dominant state like West Virginia.

Does the Delaware Energy Assistance Program (DEAP / LIHEAP) help pay for propane?

Yes. The Delaware Energy Assistance Program (DEAP) is the state's LIHEAP-funded heating-bill assistance program, administered by the Delaware Department of Health and Social Services (DHSS), Division of State Service Centers. Propane-heated households are explicitly eligible. Income eligibility is set at 60% of Delaware State Median Income, after federal and local taxes. For FY2026 the heating benefit ranges from a $100 minimum to a $2,464 maximum, the cooling benefit from $1 to $1,000, and the crisis benefit up to $10,000. The heating window runs October 1 to April 30 and crisis assistance is year-round. Apply online at the DHSS DEAP/LIHEAP page (dhss.delaware.gov/dss/liheap), call 1-302-255-9675, or dial 211. County intake lines are: New Castle 302-654-9295, Kent 302-674-1782, Sussex 302-856-6310. Apply early in the heating season because crisis-only requests can face delivery delays in peak January-February cold snaps.

Who regulates propane delivery and meter accuracy in Delaware?

Two state authorities split the work. The Delaware State Fire Marshal enforces the LP-Gas Code (NFPA 58), reviews and permits propane tank installations larger than residential 1-2 family service, licenses fire-protection-system contractors, and inspects bulk plants and retail dispensing sites. Tank plan submittals to the State Fire Marshal are mandatory for any LPG installation outside single/two-family residential and for every public retail dispensing site regardless of tank size. The State Fire Marshal can be reached at fire.marshal@state.de.us or 302-739-5665, with regulations published at statefiremarshal.delaware.gov. Separately, the Delaware Department of Agriculture (DDA) Weights and Measures Section enforces meter accuracy on every bobtail propane delivery truck operating in the state. Under Delaware Code Title 6 Chapter 51, a DDA inspector has authority to enter any propane delivery vehicle without warrant after a delivery to verify the metering system, tank compartment, and delivery ticket. If you suspect short-fill on a delivery, the DDA Weights and Measures complaint line is the right channel, not the supplier.

What's driving propane demand in Sussex County?

Sussex County is the single largest broiler-chicken-producing county in the United States, and propane-fueled poultry-house brooders are a year-round, weather-sensitive demand source. A typical 40-by-500-foot broiler house runs 10-14 propane brooders during the first 14-21 days of each flock cycle, when chicks need 90F+ floor temperatures. Multiply that across thousands of houses operated by Mountaire, Perdue, Allen Harim, and Amick growers and Sussex propane demand is structurally large and inelastic, growers can't switch fuel mid-flock without animal-welfare risk. That demand competes for the same Delaware supplier capacity that serves residential customers, and it's the largest reason rural Sussex residential rates can sit above the Delaware state average rather than below it. The same county also runs heavy on grain-drying propane in autumn (corn, soybean, and barley harvest in Bombay Hook and Prime Hook agricultural land) and irrigation-engine propane through the summer.

How does the Atlantic coast tourism cycle affect Delaware propane prices?

The Lewes / Rehoboth / Bethany / Fenwick beach corridor and the Bowers / Slaughter Beach bayside towns run a sharp seasonal demand cycle that shapes spring-to-fall pricing. Beach rental properties and seasonal homes that sit empty November through April fire up propane water heaters, ranges, pool heaters, and outdoor-kitchen appliances starting Memorial Day weekend, and many request first-fill or top-up deliveries in May. Suppliers serving Sussex coast zip codes (19958, 19971, 19930, 19944) routinely see a May-June delivery surge that overlaps with the lowest wholesale prices of the year. The tactical play for full-time coastal residents is to schedule your fall top-up in late September after the Labor Day demand wave settles, and your spring fill in late April before the seasonal-rental rush. Pre-buy contracts signed May-July almost always undercut what you'll be quoted at any other point in the year.

When is the cheapest time to buy propane in Delaware?

Late spring through midsummer (May-August). Delaware wholesale propane bottoms in June-July when refinery output is high, residential heating demand is essentially zero, and Marcus Hook terminal storage is full ahead of the next winter draw. Suppliers running pre-buy and cap-price programs typically open enrollment May 1 and close August 31. Cap-price contracts let you benefit if wholesale falls; flat pre-buy locks you in either direction. Practical cadence: top up to 75-80% in late September at shoulder-season pricing rather than entering January at 40-50% and scrambling for a January spot-rate fill, which can run $0.40-$0.80/gal above the summer low. Set your auto-fill threshold at 30% rather than 20% to give the supplier route flexibility, some Delaware suppliers offer a small per-gallon discount for the higher threshold.