Annual Maintenance Contracts (AMCs) (Annual Maintenance Contracts (AMCs))

An Annual Maintenance Contract (AMC) is a formal service agreement between a plant operator and an equipment supplier, OEM service partner, or third-party specialist that covers scheduled preventive maintenance, emergency breakdown response, spare parts supply, and technical support for defined equipment over a 12-month period. AMCs are the dominant maintenance procurement model in Indian industrial plants because they shift the cost of expertise, parts inventory, and response readiness from in-house operations onto specialised service providers — particularly important for equipment categories where in-house technical depth is uneconomical at small or medium plant scale.

Indian AMC structures fall into three commercial tiers. Comprehensive AMC covers all labour, all spare parts (excluding consumables and wear parts above a defined value cap), all routine preventive maintenance visits, and unlimited breakdown calls — typically priced at 8–14% of equipment list price per year. Non-comprehensive AMC covers labour and minor parts only, with major spares and consumables billed separately — typically 4–7% per year. Preventive-only AMC covers scheduled visits (quarterly or half-yearly) without breakdown coverage — typically 2–4% per year, suited to mature plants with strong internal maintenance teams. Most CBG and recycling plants use comprehensive AMCs for high-criticality equipment (CHP engines, biogas compressors, PSA skids, slurry pumps, PLC and SCADA systems) and lighter contracts for general-purpose items.

For Indian CBG plants, AMC selection is increasingly bundled into the original EPC tender. SATAT lenders typically require AMC commitments of 3–5 years from OEMs as a condition of debt sanction, particularly for biogas upgrading skids, gas compressors, and gas engines. AMC pricing in Indian market reference points: Rs 12–18 lakh per year for a 1,000 Nm3/hr PSA upgrading skid; Rs 8–15 lakh per year for a Vilter or Tornado biogas compressor; Rs 6–12 lakh per year for a 1 MW CHP engine. Service Level Agreements (SLAs) embedded in the contract typically specify: response time to breakdown call (4–24 hours), mean time to repair (12–72 hours), planned vs unplanned downtime targets (95%+ availability), and penalty clauses for non-performance. Effective AMC governance — including monthly review meetings, OEE tracking, and spare-part inventory verification — is what distinguishes well-run plants from those that suffer recurring downtime and warranty disputes.