Massachusetts Mandates 100% Clean Power for Big AI Data Centers
On September 8, 2026, Massachusetts Governor Maura Healey signed Executive Order 658, which requires large new data centers to match their electricity use with new clean generation or pay into a fund that protects other ratepayers. It is one of the clearest attempts yet by a government to make AI's power demand pay its own way. Here is what the order requires, what is still being written, and what operators elsewhere should take from it.
⚡ Quick facts
- Signed: September 8, 2026: Executive Order 658 by Governor Maura Healey, effective immediately
- Who it covers: data centers over 25 MW of peak demand, and expansions adding more than 25 MW
- Core rule: buy enough new, incremental clean electricity to cover annual consumption
- Fallback: a payment into the Ratepayer Protection Fund, with MassDEP setting the mechanism by December 31, 2026
- Permits: state agencies may not issue permits without compliance and a community benefits agreement
What the order requires
According to a Pierce Atwood client alert on the order's text, Executive Order 658 applies to data centers with more than 25 megawatts of peak electric demand, and to expansions that add more than 25 MW. It directs the state's environmental agency, MassDEP, to write rules requiring those projects to procure "sufficient incremental new clean electricity generation" to cover their annual consumption. The power has to be new: buying credits from wind or solar farms that already exist does not count. It must qualify under the state's Clean Energy Standard.
TechCrunch reported that the governor's office clarified the target as 100% clean electricity, and that on-site generation is encouraged but not required.
If a data center can't buy enough clean power
Projects that fall short make an alternative compliance payment into a Ratepayer Protection Fund, which is used to lower electricity supply costs for everyone else. MassDEP must set up that payment by December 31, 2026. The price has not been set, and it will decide how much the rule bites: a low payment is an easy way out, a high one forces real procurement.
Permits, water and local say
- Permits: state agencies may not issue permits unless the project meets the framework and submits a community benefits agreement.
- Local approval: WHDH reported that projects need local approval before state permits, and municipalities get state guidance due by December 31, 2026.
- Water: MassDEP must also write protocols protecting water quality and supply, including compliance with water, wastewater and stormwater rules.
- Tax break: TechCrunch and TechTarget reported that new applications for the state's data center sales-tax exemption are paused.
Law firm Sheppard Mullin notes that much of the detail depends on guidance and rules still being drafted.
Part of a wider shift
Massachusetts is not alone. TechCrunch placed the order alongside New York, which moved against new large data centers in July, and Texas, where the governor ordered reviews of grid planning in August. The common thread: states that once competed to attract data centers now want proof the projects will not raise household power bills or strain local grids. Our explainer on AI outages covers the other side of this, how much AI services depend on a few large facilities.
Our take: a worked example
Take a hypothetical 50 MW AI data center running at an average of 80% of its peak. That is about 350,000 MWh a year (50 × 0.8 × 8,760 hours). Under the order it must contract for roughly that much output from new clean generation. At a typical 25–35% capacity factor for land-based wind or solar, that means about 115–160 MW of new capacity, two to three times the data center's own peak, or the alternative payment instead.
- For operators: budget for power purchase agreements early. The ACP price, due by end of 2026, is the number to watch.
- For towns: the community benefits agreement is real leverage. Negotiate it in public.
- For everyone else: this is a template other governments can copy. Expect it to come up wherever data centers meet local power concerns.
Sources
- Pierce Atwood: Governor Healey issues Executive Order on data centers
- TechCrunch: Massachusetts hits data centers with new clean power rules
- TechTarget: Massachusetts ties data center permits to clean power
- WHDH: Healey signs order requiring local approval
- Sheppard Mullin: Guidance under Executive Order 658
Frequently asked questions
What is Massachusetts Executive Order 658?
An order Governor Maura Healey signed on September 8, 2026, requiring large data centers to match their electricity use with new clean generation or pay into a ratepayer fund.
Which data centers does it cover?
Data centers with more than 25 MW of peak electric demand, and expansions adding more than 25 MW.
Does the clean power have to be on site?
No. TechCrunch reported on-site generation is encouraged but not required. The power must come from new, incremental clean generation eligible under the state's Clean Energy Standard.
What if a data center can't buy enough clean power?
It makes an alternative compliance payment into the Ratepayer Protection Fund, which lowers supply costs for other customers. MassDEP must set the mechanism by December 31, 2026.
Does the order affect permits?
Yes. State agencies may not issue permits unless a project meets the framework and submits a community benefits agreement. Local approval is also required.
Do other states have similar rules?
TechCrunch placed it alongside recent moves in New York and Texas. Massachusetts' version is notable for tying permits directly to new clean generation.