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Commercial Solar for Office Buildings

Solar on an office building pays when the deal structure matches the lease structure. The panels are the easy part. The questions that decide the project are who pays the electric bill, how savings reach the party that paid for the system, and whether the building faces a performance standard such as Boston's BERDO that makes emissions a cost line of its own.

Ferrius Energy designs and builds solar, carports, and battery storage for office owners, REITs, and owner-occupiers across Massachusetts, New England, Florida, and Texas. This page covers metering in multi-tenant buildings, the landlord and tenant split incentive, green lease language, building performance standards, and the physical limits of mid-rise roofs.

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Last reviewed: September 2026. Building performance standard rules and incentive values change; confirm current requirements with the City of Boston, your municipality, your utility, and your tax advisor.

First question: who holds the meter?

Office buildings fall into three metering arrangements, and each points to a different project design.

Metering arrangement and solar strategy
Arrangement	Who benefits from solar	Typical approach
Owner-occupied, single meter	The owner, directly	Standard behind-the-meter system sized to base building and occupant load.
Multi-tenant, master meter, gross or modified gross lease	The landlord, who pays the utility	Behind-the-meter on the master service. Savings stay with ownership or pass through operating expenses per the lease.
Multi-tenant, tenants individually metered	Split: landlord owns house meter, tenants own theirs	Tie to the house meter (common areas, central plant, elevators, garage) or use net metering credit allocation where the state allows it.

The house meter in a directly metered building is often larger than owners expect. Central chillers or boilers, air handlers, elevators, garage ventilation and lighting, and lobby loads commonly sit on it. A rooftop array sized to that load is a clean landlord project with no tenant allocation required.

Where the array is larger than the house load, some states let the host allocate net metering credits to other accounts. Massachusetts, for example, allows net metering credit allocation for eligible facilities under DPU rules. The mechanics, caps, and export values differ by state and utility, so we confirm them on your specific accounts before sizing.

The split incentive, and how green leases resolve it

The classic problem: the landlord pays for the system, the tenant pays the power bill, and nobody invests. It is a contract problem, and it has contract solutions.

Operating expense pass-through. In gross and modified gross leases, the landlord captures the savings directly. In net leases, a green lease clause can let the landlord recover a capital cost amortization through operating expenses, capped at the verified savings, so tenants are never worse off.
Tenant power sales. In some jurisdictions a landlord can sell solar power to tenants at a discount to utility rates. Whether that makes the owner a regulated utility is a state-specific legal question to confirm with counsel before structuring it.
Data sharing. Green leases commonly require tenants to share utility data. That matters for building performance standards, which require whole-building reporting even when tenants hold the meters.
Roof rights and access. Make sure leases reserve the roof to the landlord and permit a 20 to 25 year installation, including maintenance access.

The U.S. Department of Energy's Green Lease Leaders program, run with the Institute for Market Transformation, publishes model clauses and is a practical starting point for your leasing counsel.

Compliance

BERDO and other building performance standards

Boston's Building Emissions Reduction and Disclosure Ordinance (BERDO), as amended in 2021, applies to non-residential buildings of 20,000 square feet or more and residential buildings with 15 or more units, and sets emissions standards per square foot that decline toward net zero by 2050. Larger buildings came under emissions limits first, with smaller covered buildings phased in later. Buildings that exceed their limit can make alternative compliance payments per metric ton of excess emissions, and the funds go to a city equitable emissions investment fund.

For an office owner, the point is that onsite solar reduces reported building emissions directly, because it displaces grid electricity counted against the building. Unlike a one-year REC purchase, it keeps working every compliance year. Cambridge's Building Energy Use Disclosure Ordinance (BEUDO) was amended to add net zero requirements for large non-residential buildings, and Massachusetts now requires statewide energy reporting for larger buildings. Other states and cities are adopting similar standards.

Verify the specifics. Thresholds, emissions factors, compliance years, and payment rates are set by ordinance and regulation and have been updated. Confirm your building's current obligations with the City of Boston Environment Department or your municipality before running compliance math. We model the solar contribution; your BERDO filer or energy consultant should own the compliance filing.

Solar plus electrification

Owners converting gas heat to heat pumps to cut emissions increase electric load. Solar sized to the post-electrification load, not today's bill, keeps the operating cost of the conversion in check.

Storage for peak

Office buildings peak on hot weekday afternoons with a sharp morning ramp. A battery can clip that peak and, in Massachusetts, earn ConnectedSolutions demand response revenue.

Mid-rise roofs: why the array is smaller than you think

A five-story office building has roughly one fifth the roof area per square foot of floor space of a one-story warehouse, and much of that roof is already taken. Expect to lose area to:

Mechanical equipment. Rooftop units, cooling towers, exhaust fans, and their service clearances.
Fire code setbacks and pathways. Firefighter access requirements carve out perimeter and interior pathways.
Penthouses, parapets, and neighbors. Elevator overruns and taller adjacent buildings cast shade that must be modeled hour by hour.
Wind load. Taller buildings see higher design wind pressures at roof corners and edges, which affects ballast and attachment.
Crane logistics. Urban sites often need street occupancy permits and weekend lifts.

The honest result on many mid-rise offices is that the roof array offsets the house meter or part of it, not the whole building. That can still be a strong return, and for BERDO purposes every kilowatt-hour counts.

Solar carports: where suburban offices get real capacity

Suburban office parks usually have far more parking than roof. Solar carports turn that surface lot into generation, add covered parking tenants value, and provide a natural place for EV charging. Carports cost more per watt than rooftop because of the steel and foundations, and they need geotechnical review, stormwater and lighting coordination, and snow management planning in New England. In Massachusetts, SMART has historically recognized canopy installations with an adder; confirm the current SMART 3.0 treatment before you count on it. See our solar carport page for design detail.

Federal credit and financing

Taxable owners can use the Section 48E credit: 6 percent base, 30 percent for projects under 1 MW AC or that meet prevailing wage and apprenticeship requirements. Under the One Big Beautiful Bill Act (enacted July 4, 2025), solar facilities that began construction on or before July 4, 2026 are not subject to the 2027 placed-in-service deadline, subject to continuity rules; facilities beginning construction after July 4, 2026 must be placed in service by December 31, 2027. The system qualifies for 5-year MACRS, and 100 percent bonus depreciation was made permanent in 2025. Details are in federal ITC plus SMART. Owners with a planned sale or refinancing often prefer a PPA or lease; see commercial solar financing options.

Questions

Frequently asked questions

Can a multi-tenant office building use solar if tenants pay their own electric bills?

Yes. The most common approach is to connect the array to the landlord's house meter, which serves common areas, central plant, elevators, and parking. Where the array is larger than that load, some states allow net metering credits to be allocated to other accounts. We confirm what your state and utility permit before sizing.

How do landlords recover the cost of solar in a net lease?

Through green lease provisions that allow amortized capital cost to pass through operating expenses, typically capped at verified energy savings so tenants are not worse off. Model clauses are available from the Department of Energy's Green Lease Leaders program. Your leasing counsel should adapt them to your leases.

Does onsite solar help with BERDO compliance in Boston?

Yes. Onsite solar reduces the grid electricity attributed to the building, which lowers reported emissions in every compliance year. Thresholds, emissions factors, and payment rates are set by the city and have been updated, so confirm current requirements with the City of Boston before running compliance calculations.

Is my office roof big enough for solar to matter?

On a mid-rise building the array usually offsets the house meter or part of whole-building load rather than all of it, because mechanical equipment, fire setbacks, and shading limit usable area. That can still produce a solid return. Suburban offices often get much more capacity from a parking lot carport.

Does solar interfere with a roof warranty on an office building?

It should not if the work is coordinated with the membrane manufacturer. We review the warranty terms, use approved attachment details or ballasted racking, and recommend replacing roofs with limited remaining life before installing a 25 year array.

Sources

City of Boston, Building Emissions Reduction and Disclosure (BERDO). boston.gov
City of Cambridge, Building Energy Use Disclosure Ordinance. cambridgema.gov
Massachusetts Department of Energy Resources, Building Energy Reporting. mass.gov
U.S. Department of Energy and Institute for Market Transformation, Green Lease Leaders. greenleaseleaders.com
Massachusetts Department of Public Utilities, Net Metering. mass.gov
Massachusetts Department of Energy Resources, SMART Program. mass.gov
Internal Revenue Service, Clean Electricity Investment Credit (Section 48E). irs.gov

Keep Reading

Related pages and guides

First question: who holds the meter?

The split incentive, and how green leases resolve it

Solar plus electrification

Storage for peak

Mid-rise roofs: why the array is smaller than you think

Solar carports: where suburban offices get real capacity

Federal credit and financing

Sources

Parking lots

Retail centers

Massachusetts

Occupied buildings

Financing

Budgeting