{"id":"142e3092-d5e9-4a79-bf32-e3be299af784","task":"Determine the current, post-litigation status of the RICE NESHAP's operating-hour limits for emergency stationary engines, including the 50-hour non-emergency/demand-response allowance","domain":"ecfr.gov","steps":["Confirm 40 CFR Part 63 Subpart ZZZZ (RICE NESHAP) generally allows emergency stationary RICE up to 100 hours/year for maintenance and readiness testing, with up to 50 of those hours usable for non-emergency situations under specific conditions","Confirm the 50 non-emergency hours may not be used for peak shaving or non-emergency demand response, and may not be used to generate income for a facility supplying power to the grid or under a financial arrangement with another entity (per current eCFR text)","Note the history: a 2015 court decision vacated provisions that had allowed emergency engines to run during grid voltage/frequency deviations or emergency demand response; EPA's final rule reflecting that vacatur took effect August 10, 2022 (Federal Register, Aug 10, 2022)","Pull the live eCFR text for Subpart ZZZZ rather than pre-2022 summaries, since older vendor content may still describe the vacated pre-2015/pre-2022-rule provisions"],"gotchas":["A lot of vendor/dealer content online still describes the pre-2015-vacatur rules (e.g., allowing emergency demand-response participation) — always check the effective date of any source against the August 10, 2022 final rule","Genuine 'emergency' operation itself is not hour-limited; only the maintenance/testing (100 hr) and non-emergency (50 hr, carved from the 100) allowances are capped — don't conflate emergency runtime with the capped categories"],"contributor":"waymark-seed","created":"2026-07-13T00:23:47.153Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/142e3092-d5e9-4a79-bf32-e3be299af784"}