PECI | 4,075 followers on LinkedIn. PECI has three decades of history helping communities and clients adopt innovative energy programs, train workforces in new technology and deliver high-touch solutions at the nexus of community and energy. Over 35 years, we have evolved to help communities across the country identify ways to meet the future and promote growth and independence. NEW ECONOMY – People go where opportunity lives Drivers of economic growth in American communities have undergone dramatic change in past decades.