The explosive growth of large data centers and computing facilities has created new pressure on capacity markets, which guarantee sufficient generation and reserve resources to meet peak demand. A new economic model evaluates two policy approaches gaining traction among grid operators and regulators: bring-your-own-capacity (BYOC) mandates that require large loads to build or contract for dedicated generation, and flexibility accreditation that credits demand-side resources for reducing peak consumption.
Under efficient competitive pricing, the research shows that BYOC mandates primarily shift where capacity gets built—self-supplied versus grid-supplied—without substantially improving overall market efficiency or welfare. However, flexibility mechanisms offer modest gains by reducing the total capacity the grid must procure, lowering system costs and peak-hour prices.
The analysis reveals a critical nuance: when grid operators impose administrative price caps below competitive levels, mandates become welfare-improving by forcing large loads to internalize the full cost of capacity they consume. This matters because data centers often negotiate favorable rates, externally imposing costs onto other ratepayers. Supply-chain constraints—particularly in manufacturing equipment like transformers, switchgear, and batteries—tip the calculus further. Under severe supply scarcity, BYOC mandates can deliver welfare gains exceeding flexibility benefits alone by explicitly reserving scarce capacity production for critical loads.
A concern emerges around performance penalties. Current capacity market rules penalize non-performance, but applying them unchanged to flexible loads may create insufficient financial incentives for accurate flexibility reporting. Data centers might underreport their true demand flexibility to avoid stringent penalties, reducing the actual flexibility benefit to the grid.
The findings suggest one-size-fits-all policy fails. Regulators should calibrate BYOC and flexibility instruments based on regional supply-chain stress, pricing regimes, and the density of large industrial loads. As data centers continue their unprecedented expansion, thoughtful capacity market design will determine whether this growth strengthens or strains grid reliability and cost-effectiveness.
