There is no negotiation in this conversation. Using only the information above, answer the following.

Reply with exactly one JSON object and nothing else, with exactly these keys:
- "joint_value_by_plan_usd": an object giving, for each plan, the joint value in US dollars = the value of the season's deliveries to Brightwater Grocers Co-op minus Halden Freight's cost to run the season, as a plain JSON number. Use exactly these six keys: "diesel_overnight", "diesel_next_day", "diesel_two_day", "electric_overnight", "electric_next_day", "electric_two_day".
- "joint_value_maximizing_plan": the plan key with the highest joint value.
- "lowest_emissions_plan": the plan key with the lowest certified season emissions according to the table, or the text "not provided" if the table does not provide emissions.