If your board has sat through an LL97 pitch, someone has probably offered you renewable energy credits as the painless way out: buy certificates, offset your emissions, skip the construction. We sell REC advisory ourselves, so take this in the spirit it's offered: for most of the buildings we work with, that pitch doesn't survive contact with the rules.
What the rules actually say
Under the Department of Buildings' rules for LL97, renewable energy credits are tightly constrained in two ways:
- They only offset grid electricity. RECs can be applied against Scope 2 emissions — the power your building draws from the grid. They cannot offset Scope 1: the gas or oil burned on site in your boiler and hot water plant. No quantity of certificates touches on-site combustion.
- They have to be local. Eligible credits must come from generation located in — or delivering directly into — NYISO Zone J, which is New York City, or through NYSERDA's Tier 4 program. Tier 4 exists precisely to bring large-scale renewable power into the city — projects like the transmission lines delivering Canadian hydropower and upstate wind and solar to the five boroughs. Cheap out-of-state certificates don't qualify. Credits are retired through NYGATS so each one counts exactly once.
Why that sinks the "easy button" for most co-ops
Picture the typical pre-war building we advise: steam heat, gas boiler, gas-fired hot water. Its emissions are dominated by Scope 1 — the fuel it burns in its own basement. The portion RECs are allowed to offset, grid electricity, might be a quarter of the total.
The test to run before anyone buys anything: ask what percentage of your building's emissions are Scope 2. If the answer is "we don't know," nobody should be quoting you certificates. If the answer is 25%, then even a maximal REC purchase leaves three-quarters of your overage — and the penalty on it — untouched.
Zone J and Tier 4 eligibility also makes these credits a thin, priced market — not the pennies-per-ton commodity certificates that give people the wrong intuition. The supply grows as Tier 4 projects come online, but "cheap and unlimited" it is not.
When RECs become genuinely useful
Here's the part the honest version of this pitch gets to: RECs are the back half of a good LL97 strategy.
When your building electrifies — heat pump hot water, electrified heating — your emissions migrate from Scope 1 to Scope 2. The fuel your boiler used to burn becomes electricity your building draws. And at that point, certificates change character entirely: they become the tool that offsets the new, larger electric load and carries you cleanly under your cap, especially as the 2030 limits bite.
So the sequence for a steam-heated building is:
- Cut waste — traps, insulation, controls. Immediate, cheap, shrinks everything downstream.
- Electrify — timed against the Beneficial Electrification Credit, which doubles for equipment installed before 2027.
- Then procure RECs — Zone J or Tier 4, retired through NYGATS, sized to your new Scope 2 profile.
Run in that order, certificates finish the job at a fraction of what over-building the retrofit would cost. Run first, they're an expense that changes almost nothing.
The one-line takeaway for your board packet
RECs don't reduce what your building burns — they offset what it plugs in. Electrify first, and they become the cheapest tons in your plan. Buy them first, and you've paid for a story.
If a vendor quotes your steam-heated building certificates as step one, forward them this post and watch what happens.