1 MW Solar Power Plant Cost: What Should Your Budget Include

A 1 MW solar budget needs to cover more than panels and installation. Site work, grid connection, taxes, financing, and contingency all matter. For example, a $1.20 million construction quote can become $1.55 million once another $350,000 of excluded costs and reserves are added. On a 1 MWdc plant, every $0.10/W changes the total by $100,000.

All amounts below are in U.S. dollars. The examples use stated assumptions. They are not Tongwei quotations, local market averages, or guaranteed project results.

How Much Does a 1 MW Solar Power Plant Cost?

For a 1 MWdc plant, the basic math is simple: multiply the quoted price per watt by 1,000,000 watts.

This table is just a quick way to turn a per-watt quote into a total project figure. It is not a universal price range.

For some context, the U.S. Department of Energy’s Q1 2025 modeled market prices were $1.12/Wdc for a 100 MW utility project and $1.98/Wdc for a 250 kW commercial project, both without batteries. Those projects are very different from a 1 MW plant, so the figures should not be treated as direct 1 MW quotations.^[1]

A module-only price is also very different from a complete plant price. It leaves out inverters, mounting, construction, and other work needed to get the system running.

Check Whether the Quote Means 1 MWdc or 1 MWac

1 MWdc is the combined panel rating under standard test conditions. 1 MWac is the inverter output capacity. The permitted export limit can be different from both.

Take a plant with 1.3 MWdc of panels, 1 MWac of inverter capacity, and a construction price of $1.56 million:

• Price per DC watt: $1,560,000 ÷ 1,300,000 = $1.20/Wdc.
• Price per AC watt: $1,560,000 ÷ 1,000,000 = $1.56/Wac.

It is the same plant and the same $1.56 million bill. Only the capacity basis changes. The 1.3 MWdc design also has 30% more panel capacity than a 1 MWdc design, so comparing total prices without adjusting for capacity can be misleading.

What Should the Equipment and Installation Quote Include?

An EPC contract covers engineering, procurement, and construction. What sits inside that price, however, can vary.

When looking at Tongwei module options, use the exact model and power class in the equipment schedule. The matching product specifications show dimensions, weight, voltage, and current, which can then be checked against the mounting and inverter design.

Panel count is also a quick sense check on the quoted DC capacity:

These are straight arithmetic quantities. The final number can change once string design and inverter requirements are taken into account. They also do not mean every listed wattage is available in every product range or market.

Higher-wattage panels mean fewer panels, but that does not automatically mean a cheaper installation. Module size, handling, mounting, and other costs can change too.

Trenching is another easy place for a quote to grow. If the contract includes 150 meters but the approved route needs 400 meters, another 250 meters has to be priced.

Budget for Site Work Before Committing to Land

For a site comparison, look at land cost + preparation cost + grid connection cost. The cheapest land on paper is not always the cheapest place to build.

Here is a simple hypothetical comparison:

Site B costs $40,000 more to buy, but its combined allowance is still $105,000 lower. That is the kind of difference a cheap land price can hide.

There is no single acres-per-MW number that works as a land-purchase rule. Berkeley Lab’s research shows that land needs change with system design, and power density has also changed over time.^[2]

For rooftop solar, roof life matters as well. If the roof needs replacing during the solar system’s operating life, removing and reinstalling the array can become another project cost.

The installation environment also affects module selection. Tongwei’s commercial, industrial, and utility-scale application categories are a useful starting point, but the selected model still needs to suit the real site conditions.

Keep Grid Connection Costs Separate Until Confirmed

A power line running near the site does not mean the grid can accept the project’s export. It also tells you nothing about the final connection bill.

An EPC contractor may include the on-site electrical equipment but leave utility studies, metering, protection changes, or network upgrades outside the contract. DOE guidance notes that interconnection studies can assign system-upgrade costs to a project, while flexible connections may reduce some upgrade needs.^[3]

A $1.20/Wdc construction offer with another $200,000 of connection work outside the EPC price is already at $1.40/Wdc, before other owner costs are added.

Sometimes a lower export limit can cut the connection cost. The trade-off is straightforward: any saving has to be weighed against the electricity that can no longer be exported.

Build a Complete Budget Around the EPC Price

This example uses a 1 MWdc ground-mounted plant without batteries, built on leased land.

The extra items add up to $350,000, or about 29.2% of the original EPC price. That percentage belongs to this example. It is not a standard solar-project markup.

Future land rent and operating expenses are outside this commissioning budget. Batteries and post-commissioning operating reserves are excluded too.

Double counting is an easy mistake. If freight, taxes, or commissioning tests are already inside the EPC contract, they should not appear again as separate budget items.

Timing matters as well. An incentive paid after commissioning does not help much with a deposit that has to be paid before construction starts.

Calculate Contingency From the Remaining Risks

For a $1.20 million EPC contract, the numbers look like this:

These percentages only show the math. They are not required reserve levels.

Imported equipment brings currency risk into the picture too. If $400,000 is still payable in another currency, a 5% adverse exchange-rate movement adds $20,000, assuming there is no currency protection.

Once a cost is known, it is no longer really contingency. If extra foundation work has been priced and accepted, that amount belongs in the base budget.

Include the Cost of Delayed Operation

A delay can cost money at both ends. Financing and holding costs keep running, while electricity savings or sales start later.

Assume an average outstanding construction loan of $800,000, an annual interest rate of 8%, and a 90-day delay. Using simple interest and a 365-day year:

$800,000 × 8% × 90 ÷ 365 = approximately $15,781.

That still leaves out possible extra rent, storage, insurance, and contractor charges.

There is also the electricity value you miss during the delay. If the production model shows 120,000 kWh for a delayed month and that electricity is worth $0.10/kWh, the postponed gross benefit is $12,000.

Price Battery Storage as a Separate System

Battery size needs two figures: power in MW and usable energy in MWh. One number on its own does not tell the whole story.

The battery’s nameplate capacity may need to be larger than the usable requirement because of operating limits, conversion losses, and capacity decline.

If only 90% of nameplate energy is available in the permitted operating window, delivering 2 MWh needs at least 2 ÷ 90% = 2.22 MWh of nameplate capacity. That is before conversion losses and aging allowances.

Keep the battery price separate from the PV-only cost. It makes the economics much easier to read.

For backup applications, MWh alone is not enough. A battery can have plenty of stored energy and still lack the power or starting capability needed for certain equipment.

Allow for Annual Operations and Major Replacements

The DOE’s Q1 2025 PV-only models list O&M costs of $20/kWdc-year for utility PV and $40/kWdc-year for commercial PV. Applied directly to 1,000 kWdc, that works out to $20,000 and $40,000 per year. The modeled project sizes and service scopes are different from a specific 1 MW plant, though.^[4]

A hypothetical $30,000 annual operating budget equals:

• $2,500 per month.
• $0.02/kWh if annual delivered production is 1.5 million kWh.
• $0.025/kWh if annual delivered production is 1.2 million kWh.

That is why the same annual O&M bill feels more expensive when the plant generates less electricity.

National laboratory guidance also points to system requirements and contract scope as reasons O&M costs vary.^[5]

For Tongwei modules, the applicable installation and maintenance documentation can help define the service scope. The module warranty documents are separate and show the covered remedy, claim process, and costs that may still sit with the owner.

End-of-project obligations can also carry a cost. National laboratory guidance recommends dealing with removal, transport, recycling or disposal, and site-restoration responsibilities early in project development and contracts.^[6]

Calculate Returns Using Self-Consumption and Export Separately

Do not turn the 1 MW nameplate rating directly into revenue. Generation depends on the site and system.

PVWatts can provide an early production estimate from site and system inputs. It is still a model, so the result depends on the assumptions and is not guaranteed production.^[7]

For this example, assume:

• Annual delivered generation: 1,500,000 kWh.
• Avoided variable electricity charge: $0.12/kWh.
• Export payment: $0.05/kWh.
• Annual operating expenses: $30,000.
• Initial funding requirement: $1.55 million.

Here, simple payback is initial funding divided by annual benefit after operating expenses. The calculation leaves out financing during operation, taxes, incentives, degradation, escalation, and future cost changes.

The difference between 70% and 90% self-consumption is 300,000 kWh shifted from export to on-site use. With a $0.07/kWh gap in value, that is another $21,000 per year.

This is where annual consumption totals can fool you. They do not show how much solar will spill to the grid on weekends, holidays, or during shutdowns.

Fixed charges should also stay out of the assumed $0.12/kWh unless the tariff analysis shows the solar project actually avoids them. The same applies to separately calculated demand-charge savings.

Test Lower Output and Higher Construction Costs

Now take the same example at 70% self-consumption and push the assumptions in the wrong direction:

The lower-generation cases keep the same self-consumption percentage, electricity rates, and annual operating expenses. A proper hourly model can produce a different consumption split.

Compare Savings Against the Electricity You Give Up

A cheaper design is not always the cheaper choice over time. If a $50,000 construction saving cuts annual electricity value by $10,000, the original saving is gone in five years, even before financing and discounting are considered.

The same idea applies to modeled benefits from rear-side generation or temperature performance. Keep those gains visible in the energy model instead of burying them inside the final return figure.

Finally

For a 1 MWdc project, every $0.10/W is $100,000. A $1.20 million EPC quote can become $1.55 million once connection work, site costs, taxes, financing, and contingency are included. The useful number is the full amount needed to get the plant through commissioning, not just the headline EPC price.