Peter Boogaart knows exactly what he’ll do when he retires later this month. The longtime Holland-area resident is leaving the Ottawa County Community Action Agency after six years of helping low-income families tighten up their homes to cut their often budget-crushing energy bills. Now the 66-year-old home efficiency veteran will ramp up his already strong volunteer involvement in the Holland Community Energy Plan’s home efficiency retrofit project, which aims to cut gas and electric consumption of each of the city’s 7,000-plus homes by up to 50 percent over 40 years.