The San Francisco Giants and PG&E celebrate another “green" milestone at AT&T Park. A recent lighting project resulted in a home run of energy savings for AT&T Park and the Giants. In partnership with PG&E, the ballpark recently upgraded more than 556 traditional light bulbs to new energy efficient LED lights. The switch resulted in an energy savings of 290,466 kilowatt hours during the regular baseball season, which is the same amount of energy it takes to power 30 homes. The upgrade also resulted in a rebate of about $260,000.