rm unnecessary summation and update expression math to remove warnings

Author: zolanaj

src/core/reopt.jl

@@ -485,7 +485,7 @@ function build_reopt!(m::JuMP.AbstractModel, p::REoptInputs)
 		)
 		if (p.s.storage.attr[b].installed_cost_constant != 0) || (p.s.storage.attr[b].replace_cost_constant != 0)
 			add_to_expression!(TotalStorageCapCosts, p.third_party_factor * sum(p.s.storage.attr[b].net_present_cost_cost_constant * m[:binIncludeStorageCostConstant][b] ))
-			m[:ElectricStorageCapCost] += sum(p.s.storage.attr[b].installed_cost_constant * m[:binIncludeStorageCostConstant][b])
+			m[:ElectricStorageCapCost] += p.s.storage.attr[b].installed_cost_constant * m[:binIncludeStorageCostConstant][b]
 		end
 		m[:ElectricStorageOMCost] += p.third_party_factor * p.pwf_om * p.s.storage.attr[b].om_cost_fraction_of_installed_cost * m[:ElectricStorageCapCost]
 

src/mpc/model.jl

@@ -213,9 +213,9 @@ function build_mpc!(m::JuMP.AbstractModel, p::MPCInputs)
 
 	if !isempty(p.techs.electrolyzer)
 		add_electrolyzer_constraints(m, p)
-		m[:TotalPerUnitProdOMCosts] += @expression(m,
-			sum(p.s.electrolyzer.om_cost_per_kwh * p.hours_per_time_step *
+		@expression(m, ElectrolyzerOMCost, sum(p.s.electrolyzer.om_cost_per_kwh * p.hours_per_time_step *
 			m[:dvRatedProduction][t, ts] for t in p.techs.electrolyzer, ts in p.time_steps))
+		add_to_expression!(m[:TotalPerUnitProdOMCosts], m[ElectrolyzerOMCost]) 
 	else
 		@constraint(m, [t in p.techs.elec, ts in p.time_steps],
 				m[:dvProductionToElectrolyzer][t, ts] == 0)