Solar in Mount Pleasant, SC: Costs, Savings, Incentives & Local Options

Who goes solar in Mount Pleasant, and why the town is different from Charleston

Mount Pleasant had 95,469 residents in the Census Bureau’s Vintage 2025 estimate, down 0.5% on the year: one of only two of the 24 South Carolina cities in our research set that lost population. The town is not growing outward fast any more, so the solar market here is existing homes, not new subdivisions.

Those homes are newer, more often owned and far more expensive than across the harbour.

The median Mount Pleasant home was built in 2000, 73.7% of homes are owner-occupied and the median owner-occupied value is $667,100 (ACS 2023 5-year), against a 1994 median build year and 55.6% ownership in the City of Charleston.

A higher share of buyers here can use a state tax credit and own their roof, which is why ownership, not leasing, is the usual question.

The town also runs its own permit office and fee schedule. Advice written for the City of Charleston, including its fee arithmetic and Board of Architectural Review rules, does not carry over. See our South Carolina solar guide for the state-wide picture.

Mount Pleasant electricity: which utility you are on sets the deal

Dominion Energy South Carolina is the utility the Town itself names in its notices about tree pruning in the Old Village and line hardening along Highway 41.

A Dominion customer who applies for solar now goes on the Residential Solar Choice rider (PSC Order No. 2026-374), which requires time-of-use Rate 5: a basic facilities charge of $0.4274 a day (about $12.99 a month), 29.907¢/kWh on-peak (4–8 p.m. in summer (May–Sep), 6–9 a.m. in winter), 15.074¢ off-peak and 9.623¢ super off-peak.

The standard Rate 8 charges about $10.99 a month plus 15.878¢ for the first 800 kWh.

Under Solar Choice, exports are netted monthly, in kWh, within each time-of-use period; surplus offsets lower-priced periods the same month, then banks forward. The bank is paid out each November, at avoided cost (the PR-1 off-peak winter energy credit), and the bank resets.

Credits credits never offset the basic facilities charge, and the minimum bill is $13.5. Midday solar output lands in off-peak hours, so it cannot erase the summer 4–8 p.m. peak without a battery.

Berkeley Electric Cooperative is listed by secondary sources as serving Mount Pleasant, and its nearest district office is in Awendaw on US-17 North. We have not confirmed which neighbourhoods it serves, so check the address on Berkeley’s territory search.

Its Renewable Surplus Rider credits exports at 6.03¢/kWh, charges a $150 application fee and $50 per inspection, caps homes at 20 kW AC and is not available on time-of-day rates. The full rules sit on our South Carolina net metering page.

How much solar does a Mount Pleasant home need?

Size from your own twelve months of bills, not from roof area.

Berkeley Electric publishes its own cap: annual kWh divided by 1,800, or average monthly kWh divided by 150, gives the largest AC size it will accept.

A Berkeley member using 15,000 kWh a year can therefore connect up to about 8.3 kW AC.

Dominion caps Solar Choice at 20 kW AC, and because surplus is cashed out at avoided cost each November, an array sized well above your own use earns little on the extra panels.

A house whose use peaks in the evening, from pool pumps, a second HVAC zone or EV charging, is better served by a modest array plus a battery than by a roof covered edge to edge. The system size calculator works from your own bill.

What Mount Pleasant solar costs before the panels: the Town permit

The Town of Mount Pleasant charges building permits on valuation (materials plus labour).

For $2,001 to $50,000 the fee is $69 for the first $2,000 plus $11 for each further $1,000 or part of it.

Plan review adds half the permit fee and every permit carries a $30 issuing fee. On a $25,000 contract that is $322 + $161.00 + $30 = $513.00, by our arithmetic.

The same contract in the City of Charleston pays about $282.50, so the Town’s schedule is the steeper one.

We do not publish a Mount Pleasant price per watt: our rule is twelve dated local quotes first. The Mount Pleasant solar cost page works through three example scenarios, and the state cost page explains what drives SC quotes.

Which incentives a Mount Pleasant homeowner can still claim

The South Carolina solar energy credit (SC Code §12-6-3587) is 25% of the cost of a system you own.

Each year you claim the lesser of $3,500 or half your state tax liability, carrying the rest forward up to 10 years, on Form TC-38.

On an example $28,000 system the credit is $7,000, which a household able to use the full $3,500 a year collects over two tax years.

The federal §25D credit has ended: the IRS says §25D "is not available for any property placed in service after December 31, 2025." We found no Town of Mount Pleasant solar rebate. Details and the leased-system exception are on the Mount Pleasant incentives page.

How the Town of Mount Pleasant permits a solar system

Applications go online to the Town’s Building Inspection Division at 100 Ann Edwards Lane ((843) 884-5184).

The Town says trade permits attached to a master permit are typically issued the same day; the building permit goes through plan review first.

The Town has published that any application made after 1 January 2027 must be designed to the 2024 IRC and IBC, with the 2023 National Electrical Code, so a contract signed this winter may be reviewed under the new codes if the application slips into January.

The step-by-step version, from site visit to Dominion’s or Berkeley’s permission to operate, is on the installation page.

Mount Pleasant roofs, flood zones and the Old Village

Old Village. The Town’s Old Village Historic District Guidelines say solar panels “should be placed on a rear elevation or in a valley area of the roof that is not visible from the public right of way.”

The National Register district runs from Shem Creek to McCants Drive, water side of Royall Avenue, with a wider conservation overlay set in 1979.

On non-historic buildings in the district, roof-covering changes “including solar” are on the staff-level minor-work list, so they can be approved without a full commission hearing if they meet the guidelines.

Flood zones. Since 29 January 2021 the Town’s design flood elevation is base flood elevation plus 2 feet, and the new Coastal A Zone is regulated like a VE zone.

Inverters, disconnects and batteries mounted low on a wall in an AE or VE zone are the components at risk. The Town is a Class 6 Community Rating System community, which gives residents a 20% flood insurance premium reduction.

Storms. Charleston County’s NOAA record points to wind uplift, not hail, as the design concern; the numbers are on the Mount Pleasant solar repair page.

Batteries and financing in Mount Pleasant

A battery matters more here than in an inland city with flat rates: Rate 5 prices the summer evening peak at about twice the off-peak rate, and hurricane season brings multi-day outages. Under Solar Choice storage counts only if it charges solely from onsite renewables. See Mount Pleasant battery storage.

Cash, a solar loan or home equity are the common routes. South Carolina allows leases from Office of Regulatory Staff-certified lessors but does not allow power purchase agreements. Compare options on the financing page.

Residential versus commercial solar in Mount Pleasant

Homes and businesses face different rules here. Berkeley Electric accepts small commercial systems up to 100 kW AC on non-demand rates, while larger accounts get no credit for surplus.

The Town’s economic development office targets information technology, life science, architecture and engineering, marketing and publishing, and finance: office-heavy tenants, often in leased space. The commercial solar page covers who can benefit.