Does Maryland charge a demand charge on EV charging?

Yes, and the amount depends on which utility serves the site. BGE's Schedule GL bills about $11.98 per kilowatt-month bundled across delivery and transmission; Pepco's Maryland Schedule MGT LV II, which covers the Washington suburbs, bills about $6.39 per kilowatt-month on the same basis. Both bill the plain monthly 30-minute maximum with no ratchet clause, and both figures are in the rate table above. On either book the larger cost driver is the supply strip, which re-prices quarterly and is visible ahead of time.

What happens if a site's PJM load contribution crosses 600 kilowatts?

The two Maryland utilities answer this differently. On BGE the delivery rate class does not change — the site stays on Schedule GL — and only default supply flips from the fixed quarterly strips to hourly-priced service for the following supply year, June through May. On Pepco's Maryland book a site whose contribution reaches 600 kilowatts transfers off Schedule MGT LV II to MGT LV III, which takes supply on hourly pricing only; the transfer is made annually and takes effect with the June billing month. Either way the contribution resets each June from the prior summer's five PJM coincident-peak hours, and those hours fall on summer weekday afternoons, so a low annual load factor does not imply a low contribution. The model carries the fixed-strip branch on both books and states the condition.

How heavy are Maryland's fixed charging costs?

Two fixed lines are Maryland-specific: the $300 SDAT annual report and the $75-per-port annual charger registration — about $900 a year at twelve stalls. Property tax dominates both: about 2.48% of original cost in year one in Baltimore County, roughly double that plus a per-kWh city energy tax inside Baltimore City limits.

ForgeAsset / Supercharger ROI / Maryland

Tesla Supercharger ROI in Maryland

Maryland's economics move on a quarterly clock: BGE's default Type II supply re-prices every three months, and BGE posts the coming quarters in advance — the modeled row carries the June–August 2026 strip with the September strip already visible and lower. Delivery is a plain per-kilowatt demand charge with no ratchet. The tax stack's defining feature is spread: business personal property runs $2.75 per $100 of value in Baltimore County but $5.62 plus a per-kWh energy tax in Baltimore City — the widest same-metro swing in the covered set — and every public charging port owes the state $75 a year in registration.

Model a Maryland site

What makes Maryland economics distinct

Supply you can see coming

BGE publishes its Type II standard-offer strips for future quarters — the September–November 2026 strip already prints on-peak generation at 16.3¢ against the modeled quarter's 17.6¢. The model carries the current strip and re-derives quarterly; a small true-up credit rider is excluded, so the modeled figure overstates rather than understates.

County line, not city line, decides the property tax

Baltimore County bills business personal property at $2.75 per $100 of depreciated value; Baltimore City bills $5.62 plus a roughly 1.1¢-per-kWh city energy tax. On the same equipment that is tens of thousands of dollars a year of difference across a county line — the model defaults to the county anchor for beltway and I-95 retail sites and states the city case explicitly.

The 600-kilowatt threshold changes the supply, not the rate class

A site whose PJM peak-load contribution crosses 600 kilowatts keeps its GL delivery rate — only the default supply flips from the quarterly fixed strips to hourly pricing, locked for the supply year that runs June through May, with the contribution reset each June from the prior summer's five system peaks. The model states this supply-side condition rather than modeling hourly prices.

A $75-per-port fee and a rate case on the calendar

Maryland's charger registration fee — $75 per port per year since July 2026, halved from its original level after industry pushback — adds about $900 a year at a twelve-stall site, carried in fixed operating costs. BGE filed a $156 million electric rate case in July 2026 with an order expected around January 2027; delivery rates are frozen until then, and the library re-derives at the order.

Utilities and tariffs modeled in Maryland

Utility & tariff	Energy	Demand
BGE Schedule GL + SOSThe utility files an EV-related rider whose terms are not yet verified against the filed sheets, so the modeled cost reflects the standard schedule. BGE's Schedule GL carries an EV charging demand credit and an EV charging rider whose contents are an open verification item.	14.1¢/kWh–22.2¢/kWh by time of day	$11.98/kW of monthly peak
Pepco MD MGT LV II + SOS	17.9¢/kWh–19.8¢/kWh by time of day	$6.39/kW of monthly peak

Rates are digit-verified against each utility's own filed sheets and update within two weeks of any revision. Full derivations are on the methodology page.

See Maryland in the US Supercharger Economics Map — every US Supercharger over utility territories colored by the derived effective electricity cost per dispensed kWh.

Maryland tax profile

Sales tax on hardware: 6%
Business personal property tax: 2.75% of equipment value (example rate)
Clean-fuels credit: no program
Per-kWh charging excise: none

Maryland tax defaults applied: no clean-fuels credit program exists in Maryland (the LCFS revenue line is $0; a state task force has recommended one). LLC costs use the $300 SDAT annual report, and Maryland's mandatory charger registration adds $75 per port per year — about $900 annually at a twelve-stall site — carried in fixed operating costs. Sales tax is the statewide 6% on hardware with separately stated installation labor untaxed; the electricity sales tax is already inside the modeled utility rate. Business personal property uses Baltimore County's $2.75 per $100 of depreciated value — a Baltimore City site instead pays $5.62 per $100 plus the city's roughly 1.1¢/kWh energy tax, and the fields are editable. The modeled default supply holds while the site's PJM peak-load contribution stays under 600 kilowatts; crossing it keeps the same delivery rate but moves default supply to hourly pricing for the following supply year, a supply-side condition stated rather than modeled.

Maryland programs and incentives

BGE EVsmart public make-ready

Filed program support covering 80% of make-ready cost up to $30,000 per location for public charging sites, with higher shares in designated communities; terms vary by program cycle, and a specific award enters the model through the grant inputs.

NEVI (federal, MDOT-administered)

Federal corridor DC fast-charging funding along I-95, I-70, and US-50, administered in award rounds.

Maryland charging market

Maryland carries roughly 73 Supercharger stations along the I-95 spine, the Capital Beltway, and I-70. BGE serves Baltimore and its metro counties, where most of the coverage sits. The Washington suburbs — Montgomery and Prince George's counties — are Pepco Maryland, a separate tariff book from Pepco's District of Columbia one and modeled here on its own row since August 2026. Western Maryland is Potomac Edison, which the model does not cover; addresses there see the outside-coverage notice rather than a wrong auto-selection.

Maryland Supercharger ROI — questions

Does Maryland charge a demand charge on EV charging?: Yes, and the amount depends on which utility serves the site. BGE's Schedule GL bills about $11.98 per kilowatt-month bundled across delivery and transmission; Pepco's Maryland Schedule MGT LV II, which covers the Washington suburbs, bills about $6.39 per kilowatt-month on the same basis. Both bill the plain monthly 30-minute maximum with no ratchet clause, and both figures are in the rate table above. On either book the larger cost driver is the supply strip, which re-prices quarterly and is visible ahead of time.
What happens if a site's PJM load contribution crosses 600 kilowatts?: The two Maryland utilities answer this differently. On BGE the delivery rate class does not change — the site stays on Schedule GL — and only default supply flips from the fixed quarterly strips to hourly-priced service for the following supply year, June through May. On Pepco's Maryland book a site whose contribution reaches 600 kilowatts transfers off Schedule MGT LV II to MGT LV III, which takes supply on hourly pricing only; the transfer is made annually and takes effect with the June billing month. Either way the contribution resets each June from the prior summer's five PJM coincident-peak hours, and those hours fall on summer weekday afternoons, so a low annual load factor does not imply a low contribution. The model carries the fixed-strip branch on both books and states the condition.
How heavy are Maryland's fixed charging costs?: Two fixed lines are Maryland-specific: the $300 SDAT annual report and the $75-per-port annual charger registration — about $900 a year at twelve stalls. Property tax dominates both: about 2.48% of original cost in year one in Baltimore County, roughly double that plus a per-kWh city energy tax inside Baltimore City limits.

Sources

Model a Tesla V4 Supercharger site in Maryland — payback, NPV, IRR, and a 15-year cash flow from your own inputs.

Run a Maryland scenario

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ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates and programs current as of research; verify current terms with each source before committing capital.