Convened by NREL and comprised of 425 members of PV market chain, Solar Access to Public Capital working group has released best practices guidelines for solar photovoltaic systems, with goal of increasing investor confidence in long-term viability of PV systems. SAPC Best Practices in PV System Installation and SAPC Best Practices in PV Operations and Maintenance include recommended contractor and provider qualifications, key performance indicators, and links to external resources.