Malden recently began replacing its street lights with more energy-efficient ones, which city officials estimate will save about $236,000 a year. The city contracted with Coviello Electric to undertake the project, which involves replacing all of Malden’s 3,400 standard high-pressure sodium street lights with LED bulbs. The $1.23 million project is being undertaken with the help of a $187,000 grant from the state Department of Energy Resources. Factoring in the grant, utility rebates, and energy savings, the city expects to cover the costs of the project in about two years, according to Ron Hogan, Malden’s strategic planner. The installation is expected to be completed by the end of this year.John Laidler can be reached at email@example.com.